Bdtyktl

The way my bash prompt is currently configured, it shows the whole path to the current directory. This is annoying when I'm deep inside a directory tree, as the prompt becomes so long that every command wraps into the next line. How do I make it show only the last part of the path?

This is what I have in my .bashrc:

PS1='${debian_chroot:+($debian_chroot)}[33[01;32m]u@h[33[00m]:[33[01;34m]w[33[00m]$ '



# If this is an xterm set the title to user@host:dir

case "$TERM" in

xterm*|rxvt*)

    PROMPT_COMMAND='echo -ne "33]0;${USER}@${HOSTNAME}: ${PWD/$HOME/~}07"'

    ;;

*)

    ;;

esac

Change the w (lowercase) to W (uppercase):

PS1='${debian_chroot:+($debian_chroot)}[33[01;32m]u@h[33[00m]:[33[01;34m]W[33[00m]$ '

                                                                                       ^^

           this one waaaaaay over here ------------------------------------------------+    

Have a look at the Bash Prompt HOWTO for lots of fun details. example:

user@host:/usr/local/bin$ echo $PS1

${debian_chroot:+($debian_chroot)}[33[01;31m]u@h[33[00m]:[33[01;36m]w[33[00m]$ 



user@host:/usr/local/bin$ export PS1='${debian_chroot:+($debian_chroot)}[33[01;31m]u@h[33[00m]:[33[01;36m]W[33[00m]$ '



user@host:bin$

The PROMPT_COMMAND variable, if set, is a command that gets run before displaying the prompt specified in PS1. In your case, PROMPT_COMMAND runs an echo statement with certain ANSI escape sequences that manipulate the titlebar of an Xterm.

If you suspect your PROMPT_COMMAND is overriding your PS1 prompt, you can unset it and test things out:

$ unset PROMPT_COMMAND

Finally, be sure that you're changing the PS1 definition that actually gets used. Common locations are /etc/bash.bashrc, /etc/profile, ~/.bashrc, ~/.bash_profile, ~/.profile. The system files are generally (but not always) run before the user files.

Simple bash replace command is

${VAR/pattern_to_find/pattern_to_replace}

For showing the last directory you can just do ${PWD/*//}, i.e. find any thing before and including the last '/' and replace it with nothing.

On my ubuntu machine I use:

export PS1='$(whoami):${PWD/*//}#'. 

My solution is to show the top three and bottom 2 directories when there are more than 5

So my prompt (which has other info too) looks like:

08:38:42 durrantm U2017 /home/durrantm/Dropbox/_/rails/everquote

when my pwd is actually

/home/durrantm/Dropbox/93_2016/work/code/ruby__rails/rails/everquote

My PS1 prompt is setup as follows:

HOST='[33[02;36m]h'; HOST=' '$HOST

TIME='[33[01;31m]t [33[01;32m]'

LOCATION=' [33[01;34m]`pwd | sed "s#(/[^/]{1,}/[^/]{1,}/[^/]{1,}/).*(/[^/]{1,}/[^/]{1,})/{0,1}#1_2#g"`'

BRANCH=' [33[00;33m]$(git_branch)[33[00m]n$ '

PS1=$TIME$USER$HOST$LOCATION$BRANCH

git_branch is a function which shows current git branch, I keep it in my dotfiles, it is:

git_branch () {

  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* (.*)/1/'

  }

My solution for this is slightly different in regards to how do I export it, so thought I'd share it here:

Create another prompt string variable; PS5 and export the following string in your .profile / .bash_profile file:

u: Display the current username .

W: Print the base of current working directory.

# Display username and current directory only.

export PS5='export PS1="u:W$";';

Now whenever you need to use the shorthand-ed PS, just run: eval $PS5

Or even better yet, create an alias in your .bash_aliases file: (thanks to @muru)

alias PS5='export PS1="u:W$";';

source again, and now you can just type PS5 to switch.

Show only current directory name (not full path) on bash prompt

Most of the other solutions did not work for me across all of my OSes that share my dot files: AIX, Windoze, and Linux. The bash ports were old versions that didn't support certain constructs and I didn't want to fork another process (i.e. sed, awk, etc.) which is noticeably expensive under cygwin.

The following is long but performant:

# takes a number argument of the number of last dirs to show

function DIR_LAST {

    # read -a didn't seem to work under bash 3

    IFS='/' array=($PWD)

    len=${#array[@]}

    start=$((len - $1))

    # leading / if fewer dir args: /usr/flastname not usr/flastname

    if (( $start <= 1 )); then

        start=1

        echo -n /

    fi

    for (( i = $start; $i < $len; i++ )); do

        if (( $i > $start )); then

            echo -n /

        fi

        echo -n ${array[$i]}

    done

}

export PS1="$(DIR_LAST 2) {$(hostname)} "

I want it to spit out:

/

/usr

/usr/foo

foo/bin

Notice the lack of a leading slash in the last line which is how I like it. Also, you can spit out the last 3 directories by changing the arg to DIR_LAST.

Also, I tried to do this with a regex and BASH_REMATCH but bash v3 didn't seem to like the parens and I couldn't figure out how to properly escape them. Sigh.