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Revision 1.144 by sasha, Thu Nov 15 18:40:10 2007 UTC vs.
Revision 1.165 by root, Thu Oct 2 17:06:50 2008 UTC

12emulator intended as an I<xterm>(1) replacement for users who do not 12emulator intended as an I<xterm>(1) replacement for users who do not
13require features such as Tektronix 4014 emulation and toolkit-style 13require features such as Tektronix 4014 emulation and toolkit-style
14configurability. As a result, B<rxvt-unicode> uses much less swap space -- 14configurability. As a result, B<rxvt-unicode> uses much less swap space --
15a significant advantage on a machine serving many X sessions. 15a significant advantage on a machine serving many X sessions.
16 16
17This document is also available on the World-Wide-Web at
18L<http://pod.tst.eu/http://cvs.schmorp.de/rxvt-unicode/doc/rxvt.1.pod>.
19
17=head1 FREQUENTLY ASKED QUESTIONS 20=head1 FREQUENTLY ASKED QUESTIONS
18 21
19See @@RXVT_NAME@@(7) (try C<man 7 @@RXVT_NAME@@>) for a list of 22See @@RXVT_NAME@@(7) (try C<man 7 @@RXVT_NAME@@>) for a list of
20frequently asked questions and answer to them and some common 23frequently asked questions and answer to them and some common
21problems. That document is also accessible on the World-Wide-Web at 24problems. That document is also accessible on the World-Wide-Web at
22L<http://cvs.schmorp.de/browse/rxvt-unicode/doc/rxvt.7.html>. 25L<http://pod.tst.eu/http://cvs.schmorp.de/rxvt-unicode/doc/rxvt.7.pod>.
23 26
24=head1 RXVT-UNICODE VS. RXVT 27=head1 RXVT-UNICODE VS. RXVT
25 28
26Unlike the original rxvt, B<rxvt-unicode> stores all text in Unicode 29Unlike the original rxvt, B<rxvt-unicode> stores all text in Unicode
27internally. That means it can store and display most scripts in the 30internally. That means it can store and display most scripts in the
30like mongolian or scripts requiring extremely complex combining rules, 33like mongolian or scripts requiring extremely complex combining rules,
31like tibetan or devanagari. Don't expect pretty output when using these 34like tibetan or devanagari. Don't expect pretty output when using these
32scripts. Most other scripts, latin, cyrillic, kanji, thai etc. should work 35scripts. Most other scripts, latin, cyrillic, kanji, thai etc. should work
33fine, though. A somewhat difficult case are right-to-left scripts, such 36fine, though. A somewhat difficult case are right-to-left scripts, such
34as hebrew: B<rxvt-unicode> adopts the view that bidirectional algorithms 37as hebrew: B<rxvt-unicode> adopts the view that bidirectional algorithms
35belong into the application, not the terminal emulator (too many things -- 38belong in the application, not the terminal emulator (too many things --
36such as cursor-movement while editing -- break otherwise), but that might 39such as cursor-movement while editing -- break otherwise), but that might
37change. 40change.
38 41
39If you are looking for a terminal that supports more exotic scripts, let 42If you are looking for a terminal that supports more exotic scripts, let
40me recommend C<mlterm>, which is a very user friendly, lean and clean 43me recommend C<mlterm>, which is a very user friendly, lean and clean
89 92
90Print out a message describing available options. 93Print out a message describing available options.
91 94
92=item B<-display> I<displayname> 95=item B<-display> I<displayname>
93 96
94Attempt to open a window on the named X display (B<-d> still 97Attempt to open a window on the named X display (the older form B<-d>
95respected). In the absence of this option, the display specified by the 98is still respected. but deprecated). In the absence of this option, the
96B<DISPLAY> environment variable is used. 99display specified by the B<DISPLAY> environment variable is used.
97 100
98=item B<-depth> I<bitdepth> 101=item B<-depth> I<bitdepth>
99 102
100Compile I<xft>: Attempt to find a visual with the given bit depth; 103Compile I<xft>: Attempt to find a visual with the given bit depth;
101resource B<depth>. 104resource B<depth>.
102 105
106[Please note that many X servers (and libXft) are buggy with
107respect to C<-depth 32> and/or alpha channels, and will cause all sorts
108of graphical corruption. This is harmless, but we can't do anything about
109this, so watch out]
110
103=item B<-geometry> I<geom> 111=item B<-geometry> I<geom>
104 112
105Window geometry (B<-g> still respected); resource B<geometry>. 113Window geometry (B<-g> still respected); resource B<geometry>.
106 114
107=item B<-rv>|B<+rv> 115=item B<-rv>|B<+rv>
116 124
117Turn on/off skip scrolling (allow multiple screens per refresh); resource B<skipScroll>. 125Turn on/off skip scrolling (allow multiple screens per refresh); resource B<skipScroll>.
118 126
119=item B<-tr>|B<+tr> 127=item B<-tr>|B<+tr>
120 128
121Turn on/off illusion of a transparent window background. Obsolete form of it is 129Turn on/off illusion of a transparent window background; resource B<transparent>.
122B<-ip> and it should not be used anymore; resource B<transparent>.
123 130
124I<Please note that old resource name of B<inheritPixmap> is obsolete and should be 131B<-ip> is still accepted as an obsolete alias but will be removed in
125changed to B<transparent>. Backwards compatibility support for B<inheritPixmap> will 132future versions.
126be phased out in future versions of rxvt!>
127 133
128I<Please address all transparency related issues to Sasha Vasko at 134I<Please address all transparency related issues to Sasha Vasko at
129sasha@aftercode.net. Read the FAQ (man 7 @@RXVT_NAME@@)!> 135sasha@aftercode.net. Read the FAQ (man 7 @@RXVT_NAME@@)!>
130 136
131=item B<-fade> I<number> 137=item B<-fade> I<number>
244italic> >> characters are to be printed. See resource B<boldItalicFont> 250italic> >> characters are to be printed. See resource B<boldItalicFont>
245for details. 251for details.
246 252
247=item B<-is>|B<+is> 253=item B<-is>|B<+is>
248 254
249Compile I<font-styles>: Bold/Italic font styles imply high intensity 255Compile I<font-styles>: Bold/Blink font styles imply high intensity
250foreground/background (default). See resource B<intensityStyles> for 256foreground/background (default). See resource B<intensityStyles> for
251details. 257details.
252 258
253=item B<-name> I<name> 259=item B<-name> I<name>
254 260
272 278
273=item B<-sb>|B<+sb> 279=item B<-sb>|B<+sb>
274 280
275Turn on/off scrollbar; resource B<scrollBar>. 281Turn on/off scrollbar; resource B<scrollBar>.
276 282
283=item B<-sr>|B<+sr>
284
285Put scrollbar on right/left; resource B<scrollBar_right>.
286
287=item B<-st>|B<+st>
288
289Display rxvt (non XTerm/NeXT) scrollbar without/with a trough;
290resource B<scrollBar_floating>.
291
277=item B<-si>|B<+si> 292=item B<-si>|B<+si>
278 293
279Turn on/off scroll-to-bottom on TTY output inhibit; resource 294Turn on/off scroll-to-bottom on TTY output inhibit; resource
280B<scrollTtyOutput> has opposite effect. 295B<scrollTtyOutput> has opposite effect.
281 296
287=item B<-sw>|B<+sw> 302=item B<-sw>|B<+sw>
288 303
289Turn on/off scrolling with the scrollback buffer as new lines appear. 304Turn on/off scrolling with the scrollback buffer as new lines appear.
290This only takes effect if B<-si> is also given; resource 305This only takes effect if B<-si> is also given; resource
291B<scrollWithBuffer>. 306B<scrollWithBuffer>.
292
293=item B<-sr>|B<+sr>
294
295Put scrollbar on right/left; resource B<scrollBar_right>.
296
297=item B<-st>|B<+st>
298
299Display rxvt (non XTerm/NeXT) scrollbar without/with a trough;
300resource B<scrollBar_floating>.
301 307
302=item B<-ptab>|B<+ptab> 308=item B<-ptab>|B<+ptab>
303 309
304If enabled (default), "Horizontal Tab" characters are being stored as 310If enabled (default), "Horizontal Tab" characters are being stored as
305actual wide characters in the screen buffer, which makes it possible to 311actual wide characters in the screen buffer, which makes it possible to
334 340
335=item B<-bl> 341=item B<-bl>
336 342
337Compile I<frills>: Set MWM hints to request a borderless window, i.e. 343Compile I<frills>: Set MWM hints to request a borderless window, i.e.
338if honoured by the WM, the rxvt-unicode window will not have window 344if honoured by the WM, the rxvt-unicode window will not have window
339decorations; resource B<borderLess>. 345decorations; resource B<borderLess>. If the window manager does not
346support MWM hints (e.g. kwin), enables override-redirect mode.
340 347
341=item B<-override-redirect> 348=item B<-override-redirect>
342 349
343Compile I<frills>: Sets override-redirect on the window; resource 350Compile I<frills>: Sets override-redirect on the window; resource
344B<override-redirect>. 351B<override-redirect>.
417 424
418=item B<-tcw> 425=item B<-tcw>
419 426
420Change the meaning of triple-click selection with the left mouse 427Change the meaning of triple-click selection with the left mouse
421button. Only effective when the original (non-perl) selection code is 428button. Only effective when the original (non-perl) selection code is
422in-use. Instead of selecting a full line it will extend the selection the 429in-use. Instead of selecting a full line it will extend the selection to
423end of the logical line only. resource B<tripleclickwords>. 430the end of the logical line only. resource B<tripleclickwords>.
424 431
425=item B<-insecure> 432=item B<-insecure>
426 433
427Enable "insecure" mode, which currently enables most of the escape 434Enable "insecure" mode, which currently enables most of the escape
428sequences that echo strings. See the resource B<insecure> for more 435sequences that echo strings. See the resource B<insecure> for more
448 455
449Turn on/off hold window after exit support. If enabled, @@RXVT_NAME@@ 456Turn on/off hold window after exit support. If enabled, @@RXVT_NAME@@
450will not immediately destroy its window when the program executed within 457will not immediately destroy its window when the program executed within
451it exits. Instead, it will wait till it is being killed or closed by the 458it exits. Instead, it will wait till it is being killed or closed by the
452user; resource B<hold>. 459user; resource B<hold>.
460
461=item B<-cd> I<path>
462
463Sets the working directory for the shell (or the command specified via
464B<-e>). The I<path> must be an absolute path and it must exist for
465@@RXVT_NAME@@ to start; resource B<chdir>.
466
467=item B<-xrm> I<string>
468
469Works like the X Toolkit option of the same name, by adding the I<string>
470as if it were specified in a resource file. Resource values specified this
471way take precedence over all other resource specifications.
472
473Note that you need to use the I<same> syntax as in the .Xdefaults file,
474e.g. C<*.background: black>. Also note that all @@RXVT_NAME@@-specific
475options can be specified as long-options on the commandline, so use
476of B<-xrm> is mostly limited to cases where you want to specify other
477resources (e.g. for input methods) or for compatibility with other
478programs.
453 479
454=item B<-keysym.>I<sym> I<string> 480=item B<-keysym.>I<sym> I<string>
455 481
456Remap a key symbol. See resource B<keysym>. 482Remap a key symbol. See resource B<keysym>.
457 483
492If this switch is given, @@RXVT_NAME@@ will not create any utmp/wtmp 518If this switch is given, @@RXVT_NAME@@ will not create any utmp/wtmp
493entries and will not tinker with pty/tty permissions - you have to do that 519entries and will not tinker with pty/tty permissions - you have to do that
494yourself if you want that. 520yourself if you want that.
495 521
496As an extremely special case, specifying C<-1> will completely suppress 522As an extremely special case, specifying C<-1> will completely suppress
497pty/tty operations. 523pty/tty operations, which is probably only useful in conjunction with some
524perl extension that manages the terminal.
498 525
499Here is a example in perl that illustrates how this option can be used (a 526Here is a example in perl that illustrates how this option can be used (a
500longer example is in F<doc/pty-fd>): 527longer example is in F<doc/pty-fd>):
501 528
502 use IO::Pty; 529 use IO::Pty;
516Comma-separated list of perl extension scripts to use (or not to use) in 543Comma-separated list of perl extension scripts to use (or not to use) in
517this terminal instance. See resource B<perl-ext> for details. 544this terminal instance. See resource B<perl-ext> for details.
518 545
519=back 546=back
520 547
521=head1 RESOURCES (available also as long-options) 548=head1 RESOURCES
522 549
523Note: `@@RXVT_NAME@@ --help' gives a list of all resources (long 550Note: `@@RXVT_NAME@@ --help' gives a list of all resources (long
524options) compiled into your version. 551options) compiled into your version. All resources are also available as
552long-options.
525 553
526You can set and change the resources using X11 tools like B<xrdb>. Many 554You can set and change the resources using X11 tools like B<xrdb>. Many
527distribution do also load settings from the B<~/.Xresources> file when X 555distribution do also load settings from the B<~/.Xresources> file when X
528starts. @@RXVT_NAME@@ will consult the following files/resources in order, 556starts. @@RXVT_NAME@@ will consult the following files/resources in order,
529with later settings overwriting earlier ones: 557with later settings overwriting earlier ones:
531 1. system-wide app-defaults file, either locale-dependent OR global 559 1. system-wide app-defaults file, either locale-dependent OR global
532 2. app-defaults file in $XAPPLRESDIR 560 2. app-defaults file in $XAPPLRESDIR
533 3. RESOURCE_MANAGER property on root-window OR $HOME/.Xdefaults 561 3. RESOURCE_MANAGER property on root-window OR $HOME/.Xdefaults
534 4. SCREEN_RESOURCES for the current screen 562 4. SCREEN_RESOURCES for the current screen
535 5. $XENVIRONMENT file OR $HOME/.Xdefaults-<nodename> 563 5. $XENVIRONMENT file OR $HOME/.Xdefaults-<nodename>
564 6. resources specified via -xrm on the commandline
536 565
537Note that when reading X resources, B<@@RXVT_NAME@@> recognizes two class 566Note that when reading X resources, B<@@RXVT_NAME@@> recognizes two class
538names: B<Rxvt> and B<URxvt>. The class name B<Rxvt> allows resources 567names: B<Rxvt> and B<URxvt>. The class name B<Rxvt> allows resources
539common to both B<@@RXVT_NAME@@> and the original I<rxvt> to be easily 568common to both B<@@RXVT_NAME@@> and the original I<rxvt> to be easily
540configured, while the class name B<URxvt> allows resources unique to 569configured, while the class name B<URxvt> allows resources unique to
550=item B<depth:> I<bitdepth> 579=item B<depth:> I<bitdepth>
551 580
552Compile I<xft>: Attempt to find a visual with the given bit depth; 581Compile I<xft>: Attempt to find a visual with the given bit depth;
553option B<-depth>. 582option B<-depth>.
554 583
584=item B<buffered:> I<boolean>
585
586Compile I<xft>: Turn on/off double-buffering for xft (default enabled).
587On some card/driver combination enabling it slightly decreases
588performance, on most it greatly helps it. The slowdown is small, so it
589should normally be enabled.
590
555=item B<geometry:> I<geom> 591=item B<geometry:> I<geom>
556 592
557Create the window with the specified X window geometry [default 80x24]; 593Create the window with the specified X window geometry [default 80x24];
558option B<-geometry>. 594option B<-geometry>.
559 595
642 678
643B<False>: specify that everything is to be displayed, even 679B<False>: specify that everything is to be displayed, even
644if the refresh is too fast for the human eye to read anything (or the 680if the refresh is too fast for the human eye to read anything (or the
645monitor to display anything); option B<+ss>. 681monitor to display anything); option B<+ss>.
646 682
647=item B<inheritPixmap:> I<boolean> 683=item B<transparent:> I<boolean>
648 684
649B<True>: make the background inherit the parent windows' pixmap, giving 685Turn on/off illusion of a transparent window background.
650artificial transparency. B<False>: do not inherit the parent windows'
651pixmap.
652 686
653I<Please note that transparency of any kind if completely unsupported by 687B<inheritPixmap> is still accepted as an obsolete alias but will be removed in
654the author. Don't bug him with installation questions!> 688future versions.
689
690I<Please address all transparency related issues to Sasha Vasko at
691sasha@aftercode.net. Read the FAQ (man 7 @@RXVT_NAME@@)!>
655 692
656=item B<fading:> I<number> 693=item B<fading:> I<number>
657 694
658Fade the text by the given percentage when focus is lost; option B<-fade>. 695Fade the text by the given percentage when focus is lost; option B<-fade>.
659 696
695The colour of the border around the text area and between the scrollbar 732The colour of the border around the text area and between the scrollbar
696and the text. 733and the text.
697 734
698=item B<backgroundPixmap:> I<file[;geom[:op1][:op2][...]]> 735=item B<backgroundPixmap:> I<file[;geom[:op1][:op2][...]]>
699 736
700Use the specified image file for the background and also optionally 737Use the specified image file for the background and also
701specify its scaling with a geometry string B<WxH+X+Y>, 738optionally specify its scaling with a geometry string B<WxH+X+Y>,
702in which B<"W" / "H"> specify the horizontal/vertical scale (percent), 739(default C<0x0+50+50>) in which B<"W" / "H"> specify the
703and B<"X" / "Y"> locate the image centre (percent). 740horizontal/vertical scale (percent), and B<"X" / "Y"> locate the image
704A scale of 0 displays the image with tiling. A scale of 1 displays the 741centre (percent). A scale of 0 displays the image with tiling. A scale
705image without any scaling. A scale of 2 to 9 specifies an integer 742of 1 displays the image without any scaling. A scale of 2 to 9 specifies
706number of images in that direction. No image will be magnified beyond 743an integer number of images in that direction. No image will be magnified
70710 times its original size. The maximum permitted scale is 1000. 744beyond 10 times its original size. The maximum permitted scale is 1000.
708Additional operations can be specified after colon B<:op1:op2...>. 745Additional operations can be specified after colon B<:op1:op2...>.
709Supported operations are: 746Supported operations are:
747
710 B<"tile"> - force background image to be tiled and not scaled. Equivalent to 0x0, 748 tile force background image to be tiled and not scaled. Equivalent to 0x0
711 B<"propscale"> - will scale image keeping proportions, 749 propscale will scale image keeping proportions
712 B<"auto"> - will scale image to match window size. Equivalent to 100x100; 750 auto will scale image to match window size. Equivalent to 100x100
713 B<"hscale"> - will scale image horizontally to the window size; 751 hscale will scale image horizontally to the window size
714 B<"vscale"> - will scale image vertically to the window size; 752 vscale will scale image vertically to the window size
715 B<"scale"> - will scale image to match window size; 753 scale will scale image to match window size
716 B<"root"> - will tile image as if it was a root window background, auto-adjusting 754 root will tile image as if it was a root window background, auto-adjusting
717 whenever terminal window moves. 755 whenever terminal window moves
718 756
719If used in conjunction with B<-tr> option - specified pixmap will be 757If used in conjunction with B<-tr> option, the specified pixmap will be
720blended over transparency image using either alpha-blending, or any 758blended over transparency image using either alpha-blending, or any
721other blending type, specified with B<-blt "type"> option. 759other blending type, specified with B<-blt "type"> option.
722[default 0x0+50+50]
723 760
724=item B<path:> I<path> 761=item B<path:> I<path>
725 762
726Specify the colon-delimited search path for finding background image files. 763Specify the colon-delimited search path for finding background image files.
727 764
788text font will being used for the given style. 825text font will being used for the given style.
789 826
790=item B<intensityStyles:> I<boolean> 827=item B<intensityStyles:> I<boolean>
791 828
792When font styles are not enabled, or this option is enabled (B<True>, 829When font styles are not enabled, or this option is enabled (B<True>,
793option B<-is>, the default), bold and italic font styles imply high 830option B<-is>, the default), bold/blink font styles imply high
794intensity foreground/background colours. Disabling this option (B<False>, 831intensity foreground/background colours. Disabling this option (B<False>,
795option B<+is>) disables this behaviour, the high intensity colours are not 832option B<+is>) disables this behaviour, the high intensity colours are not
796reachable. 833reachable.
797 834
798=item B<selectstyle:> I<mode>
799
800Set mouse selection style to B<old> which is 2.20, B<oldword> which
801is xterm style with 2.20 old word selection, or anything else which
802gives xterm style selection. Only effective when the original (non-perl)
803selection code is in use.
804
805=item B<scrollstyle:> I<mode>
806
807Set scrollbar style to B<rxvt>, B<plain>, B<next> or B<xterm>. B<plain> is
808the author's favourite.
809
810=item B<title:> I<string> 835=item B<title:> I<string>
811 836
812Set window title string, the default title is the command-line 837Set window title string, the default title is the command-line
813specified after the B<-e> option, if any, otherwise the application 838specified after the B<-e> option, if any, otherwise the application
814name; option B<-title>. 839name; option B<-title>.
858 883
859 URxvt.print-pipe: cat > $(TMPDIR=$HOME mktemp urxvt.XXXXXX) 884 URxvt.print-pipe: cat > $(TMPDIR=$HOME mktemp urxvt.XXXXXX)
860 885
861This creates a new file in your home directory with the screen contents 886This creates a new file in your home directory with the screen contents
862every time you hit C<Print>. 887every time you hit C<Print>.
888
889=item B<scrollstyle:> I<mode>
890
891Set scrollbar style to B<rxvt>, B<plain>, B<next> or B<xterm>. B<plain> is
892the author's favourite.
863 893
864=item B<scrollBar:> I<boolean> 894=item B<scrollBar:> I<boolean>
865 895
866B<True>: enable the scrollbar [default]; option B<-sb>. B<False>: 896B<True>: enable the scrollbar [default]; option B<-sb>. B<False>:
867disable the scrollbar; option B<+sb>. 897disable the scrollbar; option B<+sb>.
1000will be created). In this mode, characters outside ISO-8859-1 can be used. 1030will be created). In this mode, characters outside ISO-8859-1 can be used.
1001 1031
1002When the selection extension is not used, only ISO-8859-1 characters can 1032When the selection extension is not used, only ISO-8859-1 characters can
1003be used. If not specified, the built-in default is used: 1033be used. If not specified, the built-in default is used:
1004 1034
1005B<< BACKSLASH `"'&()*,;<=>?@[]{|} >> 1035B<< BACKSLASH `"'&()*,;<=>?@[]^{|} >>
1006 1036
1007=item B<preeditType:> I<style> 1037=item B<preeditType:> I<style>
1008 1038
1009B<OverTheSpot>, B<OffTheSpot>, B<Root>; option B<-pt>. 1039B<OverTheSpot>, B<OffTheSpot>, B<Root>; option B<-pt>.
1010 1040
1066 1096
1067=item B<secondaryScroll:> I<boolean> 1097=item B<secondaryScroll:> I<boolean>
1068 1098
1069Turn on/off secondary screen scroll (default enabled). If this 1099Turn on/off secondary screen scroll (default enabled). If this
1070option is enabled, scrolls on the secondary screen will change the 1100option is enabled, scrolls on the secondary screen will change the
1071scrollback buffer and switching to/from the secondary screen will 1101scrollback buffer and, when secondaryScreen is off, switching
1072instead scroll the screen up. 1102to/from the secondary screen will instead scroll the screen up.
1073 1103
1074=item B<hold>: I<boolean> 1104=item B<hold>: I<boolean>
1075 1105
1076Turn on/off hold window after exit support. If enabled, @@RXVT_NAME@@ 1106Turn on/off hold window after exit support. If enabled, @@RXVT_NAME@@
1077will not immediately destroy its window when the program executed within 1107will not immediately destroy its window when the program executed within
1078it exits. Instead, it will wait till it is being killed or closed by the 1108it exits. Instead, it will wait till it is being killed or closed by the
1079user. 1109user.
1110
1111=item B<chdir>: I<path>
1112
1113Sets the working directory for the shell (or the command specified via
1114B<-e>). The I<path> must be an absolute path and it must exist for
1115@@RXVT_NAME@@ to start. If it isn't specified then the current working
1116directory will be used; option B<-cd>.
1080 1117
1081=item B<keysym.>I<sym>: I<string> 1118=item B<keysym.>I<sym>: I<string>
1082 1119
1083Compile I<frills>: Associate I<string> with keysym I<sym>. The 1120Compile I<frills>: Associate I<string> with keysym I<sym>. The
1084intervening resource name B<keysym.> cannot be omitted. 1121intervening resource name B<keysym.> cannot be omitted.
1445=back 1482=back
1446 1483
1447=head2 ALPHA CHANNEL SUPPORT 1484=head2 ALPHA CHANNEL SUPPORT
1448 1485
1449If Xft support has been compiled in and as long as Xft/Xrender/X don't get 1486If Xft support has been compiled in and as long as Xft/Xrender/X don't get
1450their act together, rxvt-unicode will support C<rgba:rrrr/gggg/bbbb/aaaa> 1487their act together, rxvt-unicode will do it's own alpha channel management:
1451(recommended, but B<MUST> have 4 digits/component) colour specifications, 1488
1452in addition to the ones provided by X, where the additional A component 1489You can prefix any color with an opaquenes percentage enclosed in
1490brackets, i.e. C<[percent]>, where C<percent> is a decimal percentage
1491(0-100) that specifies the opacity of the color, where C<0> is completely
1492transparent and C<100> is completely opaque. For example, C<[50]red> is a
1493half-transparent red, while C<[95]#00ff00> is an almost opaque green. This
1494is the recommended format to specify transparency values, and works with
1495all ways to specify a colour.
1496
1497For complete control, rxvt-unicode also supports
1498C<rgba:rrrr/gggg/bbbb/aaaa> (exactly four hex digits/component) colour
1499specifications, where the additional C<aaaa> component specifies opacity
1453specifies opacity (alpha) values. The minimum value of C<0> is completely 1500(alpha) values. The minimum value of C<0000> is completely transparent,
1454transparent). You can also prefix any color with C<[percent]>, where 1501while C<ffff> is completely opaque). The two example colours from
1455C<percent> is a decimal percentage (0-100) that specifies the opacity of 1502earlier could also be specified as C<rgba:ff00/0000/0000/8000> and
1456the color, where C<0> is completely transparent and C<100> is completelxy 1503C<rgba:0000/ff00/0000/f332>.
1457opaque.
1458 1504
1459You probably need to specify B<"-depth 32">, too, and have the luck that 1505You probably need to specify B<"-depth 32">, too, to force a visual with
1460your X-server uses ARGB pixel layout, as X is far from just supporting 1506alpha channels, and have the luck that your X-server uses ARGB pixel
1461ARGB visuals out of the box, and rxvt-unicode just fudges around. 1507layout, as X is far from just supporting ARGB visuals out of the box, and
1508rxvt-unicode just fudges around.
1462 1509
1463For example, the following selects an almost completely transparent red 1510For example, the following selects an almost completely transparent black
1464background, and an almost opaque pink foreground: 1511background, and an almost opaque pink foreground:
1465 1512
1466 @@RXVT_NAME@@ -depth 32 -bg rgba:0000/0000/0000/aaaa -fg "[80]pink" 1513 @@RXVT_NAME@@ -depth 32 -bg rgba:0000/0000/0000/4444 -fg "[80]pink"
1467 1514
1468I<Please note that transparency of any kind if completely unsupported by 1515When not using a background image, then the interpretation of the
1469the author. Don't bug him with installation questions!> 1516alpha channel is up to your compositing manager (most interpret it as
1517transparency of course).
1518
1519When using a background pixmap or pseudo-transparency, then the background
1520colour will always behave as if it were completely transparent (so the
1521background image shows instead), regardless of how it was specified, while
1522other colours will either be transparent as specified (the background
1523image will show through) on servers supporting the RENDER extension, or
1524fully opaque on servers not supporting the RENDER EXTENSION.
1525
1526Please note that due to bugs in Xft, specifying alpha values might result
1527in garbage being displayed when the X-server does not support the RENDER
1528extension.
1470 1529
1471=head1 ENVIRONMENT 1530=head1 ENVIRONMENT
1472 1531
1473B<@@RXVT_NAME@@> sets and/or uses the following environment variables: 1532B<@@RXVT_NAME@@> sets and/or uses the following environment variables:
1474 1533
1508C<--with-terminfo=PATH>. 1567C<--with-terminfo=PATH>.
1509 1568
1510=item B<DISPLAY> 1569=item B<DISPLAY>
1511 1570
1512Used by @@RXVT_NAME@@ to connect to the display and set to the correct 1571Used by @@RXVT_NAME@@ to connect to the display and set to the correct
1513display in its child processes. 1572display in its child processes if C<-display> isn't used to override. It
1573defaults to C<:0> if it doesn't exist.
1514 1574
1515=item B<SHELL> 1575=item B<SHELL>
1516 1576
1517The shell to be used for command execution, defaults to C</bin/sh>. 1577The shell to be used for command execution, defaults to C</bin/sh>.
1518 1578

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