Question

31

Why is my function not re-evaluated in PS1?

rated 0 times [ 31] [ 0] / answers: 1 / hits: 7292 / 2 Years ago, tue, august 23, 2022, 11:40:54

I'm trying to have a part of my prompt set dynamically by a function, so in my .bashrc I have:

asdf ()

{

    echo -n $(pwd)

}

PS1="u@h:w $(asdf)$ "

Opening a shell gives me what I expect at first:

$ bash

darthbith@server:~/test /home/darthbith/test$

However, when I change directory, the part defined by the function doesn't change:

darthbith@server:~/test /home/darthbith/test$ cd ~/test2

darthbith@server:~/test2 /home/darthbith/test$

My actual goal is to use the git-prompt.sh script to show the branch of my git repository when I'm in one with pretty colors and everything, but the problem is that it never updates the branch name when I change repositories. The trivial example above is the simplest reproduction I could come up with for my question.

The .bashrc lines that I have to integrate the git-prompt script:

source ~/.git-prompt.sh

PS1="[033[01;32m]u@h[033[00m]:[033[01;34m]w[033[00m]$(__git_ps1)$ "

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cklaceowne

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3 Years ago

answered 2 Years ago huovie · Accepted Answer

According to Bash prompt Howto:

[21:58:33][giles@nikola:~]$ PS1="[$(date +%H%M)][u@h:w]$ "

[2159][giles@nikola:~]$ ls

bin   mail

[2200][giles@nikola:~]$
It's important to notice the backslash before the dollar sign of the command substitution. Without it, the external command is executed exactly once: when the PS1 string is read into the environment.