[SOLVED] Bash prompt displays twice

mattca · 02-19-2010, 11:12 PM

I'm playing around with my prompt, and for some reason under certain conditions part of the prompt is output twice. I have no idea why.

- When my terminal window isn't maximized it always outputs the prompt correctly.
- When the window is maximized it outputs the prompt correctly when I enter an empty command (ie, when I just hit enter).
- When it is maximized and I enter any command, it outputs the second line of my prompt twice.

I'm using urxvt.. I tested in xterm and it seems to work correctly, so I guess it's an issue with urxvt. Any clue as to where I should start digging?

Thanks!

My prompt code:

Code:

#!/bin/bash

function redblue {
	local       BLUE="\[\033[0;34m\]"
	local        RED="\[\033[0;31m\]"
	local  LIGHT_RED="\[\033[1;31m\]"
	local      WHITE="\[\033[1;37m\]"
	local LIGHT_GRAY="\[\033[0;37m\]"
	case $TERM in
		xterm*)
			TITLEBAR='\[\033]0;\u@\h:\w\007\]'
			;;
		*)
			TITLEBAR=""
			;;
	esac

	PS1="${TITLEBAR}\
	$BLUE[$RED\d, \t$BLUE] [$LIGHT_RED\w$BLUE]\n\
	$BLUE[$LIGHT_RED\u$BLUE@$LIGHT_RED\h$BLUE] $RED\$$LIGHT_GRAY "
	PS2='> '
	PS4='+ '
}

I started with code from this site: http://www.gilesorr.com/bashprompt/prompts/

This is what the prompt is supposed to look like:

Code:

	[Fri Feb 19, 23:57:58] [~]
	[matt@hopper] $ cd /var/log
	[Fri Feb 19, 23:58:01] [/var/log]
	[matt@hopper] $ ls                                                      
Xorg.0.log	debug	 lastlog   removed_packages  secure   wtmp
Xorg.0.log.old	dmesg	 maillog   removed_scripts   setup
btmp		faillog  messages  sa		     spooler
cron		httpd	 nfsd	   samba	     syslog
cups		iptraf	 packages  scripts	     uucp
	[Fri Feb 19, 23:58:02] [/var/log]
	[matt@hopper] $

This is what it looks like when it displays incorrectly:

Code:

	[Fri Feb 19, 23:58:59] [~]
	[matt@hopper] $ cd /var/log/
	[Fri Feb 19, 23:59:06] [/var/log]
	[matt@hopper] $ 
        [matt@hopper] $ ls
Xorg.0.log	btmp  cups   dmesg    httpd   lastlog  messages  packages	   removed_scripts  samba    secure  spooler  uucp
Xorg.0.log.old	cron  debug  faillog  iptraf  maillog  nfsd	 removed_packages  sa		    scripts  setup   syslog   wtmp
	[Fri Feb 19, 23:59:08] [/var/log]
	[matt@hopper] $ 
        [matt@hopper] $

[Edit: sorry if this isn't the best forum for this post, I wasn't sure where to put it!]

GrapefruiTgirl · 02-19-2010, 11:44 PM

I'm not sure what-all is not quite right about this code, but it doesn't work for me, even remotely, in xterm.

A couple tips (Bash specifics, but may work for other too):

1) (this is maybe more an FYI than anything, but thought I'd point it out) defining a function doesn't need the "function" keyword, so this is fine:

Code:

redblue () {

  code in here...
   more code.. blah blah
  code code code...

} #end of function

2) I am finding problems with the way you are creating your colors. To create a color, you merely need:

Code:

BLUE="\033[0;33m"

Note that I have not added any [brackets] around that; it will work just fine like this. When I try it your original way, the escaped brackets such as "\[blah\]" are being interpreted by the shell as test commands (test being the [ symbol), so it acts very strange for me in that regard, and my prompt ends up beginning with the word "test".

So, whether or not the "function" keyword is causing any trouble, I would definitely revisit those escaped brackets in your COLOR variables. I don't see any actual code on that page you linked, so if there's some specific example that would explain where you're coming from, please do post a link to that.

Hope this helps!

mattca · 02-19-2010, 11:57 PM

Oh my god, thank you! Removing the escaped square brackets fixed it!

GrapefruiTgirl · 02-19-2010, 11:59 PM

Nice one! Glad you got it sorted

Sasha