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I currently have my bash PS1 set to something like this:

PS1="\[\`if [[ \$? = "0" ]]; then echo '\e[32m\h\e[0m'; else echo '\e[31m\h\e[0m' ; fi\`:\w\n\$ "

How can I make it show the absolute path instead of the relative one (e.g. /home/dave/dir instead of ~/dir)?

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/home/dave/dir and ~/dir are both absolute paths, the second uses an abbreviation for your home directory. A relative path is a path that is relative to your current directory (e.g. ../dir) rather than starting at root (/). –  Doug Harris Oct 22 '10 at 13:38
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p.s. Nice use of color to indicate exit status of previous command. Probably the first use of color in a prompt that I've liked. –  Doug Harris Oct 22 '10 at 13:54
    
@Doug Harris: Thanks for the correction. I like this coloring, too. Don't remember where I first saw it (perhaps in some previous SU post?) –  David B Oct 22 '10 at 17:15
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5 Answers

up vote 7 down vote accepted

Just replace \w with the environment variable PWD:

PS1="\[\`if [[ \$? = "0" ]]; then echo '\e[32m\h\e[0m'; else echo '\e[31m\h\e[0m' ; fi\`:\$PWD\n\$ "

Anyway if you mind a little tip, I'd write something like:

PS1='\[`[ $? = 0 ] && X=2 || X=1; tput setaf $X`\]\h\[`tput sgr0`\]:$PWD\n\$ '
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I thought of this, too, but the $PWD is evaluated at the time of the assignment to PS1, not on each call. However, if you escape the dollar sign, it will work -- \$PWD. With this, the dollar sign is a dollar sign at time of assignment and the variable evaluation happens on each prompt. +1 to you. –  Doug Harris Oct 22 '10 at 15:47
    
Right, missed that \, I usually work with single quotes if it's possible. Thanks. –  cYrus Oct 22 '10 at 16:06
    
+1 Thanks! could you please explain the magic in your beautiful bash line (the 'tip' one)? –  David B Oct 22 '10 at 17:12
    
Sure. I used tput (see man tput for more info) to change the colors rather than write the control characters directly, for readability and portability (?). Also I removed double quotes and back slashes by using single quotes. Finally by using a variable I avoided some redundancy. –  cYrus Oct 22 '10 at 17:30
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Put in your home .bashrc

PS1='\u@\h:\w\$ '
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in bash's ps1; -W should be relative, and -w absolute, so in the above you should already have the absolute ?!

http://wiki.archlinux.org/index.php/Color_Bash_Prompt

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I think you're confusing absolute|relative with full|current_dir. W shows only the current directory name, w shows the full path, but still uses relative paths. –  David B Oct 22 '10 at 9:41
    
was the terminology in the url, not mine :) –  Sirex Oct 22 '10 at 9:57
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Humm ~/dir is an absolute path but using a "shortcut". For instance, if you do cd /usr/local your prompt will most probably display the full path of /usr/local. So anyway, you have already a full path :-)

But probably your correct question is how to display the full path without any shortcuts like ~?

However, I don't know an answer for that one and looking at the man, it does seem to have one (at least documented).

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Thanks for the correction. –  David B Oct 22 '10 at 17:14
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Run pwd instead of using \W.

Simple version:

export PS1="\`pwd\` $ "

Using this in your code:

export PS1="\[\`if [[ \$? = "0" ]]; then echo '\e[32m\h\e[0m'; else echo '\e[31m\h\e[0m' ; fi\`:\`pwd\`\n\$ "
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minor point: per google's bash style guide, prefer $(pwd) to backticks because backticks require escaping when nesting and $() doesn't. –  funroll Apr 11 '13 at 19:19
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