I want to run a script to search the /etc/bash.bashrc file for the substring
PS1=
and replace the entire line with:
PS1='\[\e[36m\]\h\[\e[m\]\[\e[33m\]@\[\e[m\]\[\e[33m\]\u\[\e[m\]:\[\e[32m\]\W\[\e[m\]>\\$ '
This new line is intended to change the cli prompt.
I have tried and tried sed in a bash script but I couldn't get the regex right.
[Edit] This code now works:
#!/bin/bash
custom_prompt='${debian_chroot:+($debian_chroot)}\[\e[36;40m\]\u\[\e[m\]\[\e[93m\]@\[\e[m\]\[\e[36m\]\h\[\e[m\]:\[\e[92m\]\w\[\e[m\]\[\e[92m\]\\$\[\e[m\]\[\e[93m\]>\[\e[m\]\'
### Setup Bash Prompt
# replace each \ for double \\ in the prompt string
sed_custom_prompt=$(<<<"$custom_prompt" sed 's/\\/\\\\/g')
# add this to /etc/bashrc for global effect
sed -i "s/PS1=.*/PS1=\"$sed_custom_prompt\"/" testrc
The only problem is that it does PS1= " string "
rather than PS1 = ' string ' with back tics.
I need a simple old fashioned non-regex script that finds a string and replaces a line in a file. Regex can find the string but my original statement messed up the substitution.
I don't care if it is perl, awk or bash. I just need something that works.
You should escape every \ to make sure they aren't lost.
EDIT: The PS1 string should be wrapped with double quotes as well.
$ custom_prompt="\[\e[36m\]\h\[\e[m\]\[\e[33m\]@\[\e[m\]\[\e[33m\]\u\[\e[m\]:\[\e[32m\]\W\[\e[m\]>\\$ "
$ sed_custom_prompt=$(<<<"$custom_prompt" sed 's/\\/\\\\/g')
$ sed -i "s/PS1=.*/PS1=\"$sed_custom_prompt\"/" testrc
$ source testrc
laptop@user:~>$
The following code works on my laptop. The problem was in last \ character in the string of your PS1 variable (I removed it):
#! /bin/bash
custom_prompt='${debian_chroot:+($debian_chroot)}\[\e[36;40m\]\u\[\e[m\]\[\e[93m\]@\[\e[m\]\[\e[36m\]\h\[\e[m\]:\[\e[92m\]\w\[\e[m\]\[\e[92m\]\\$\[\e[m\]\[\e[93m\]>\[\e[m\] '
### Setup Bash Prompt
# replace each \ for double \\ in the prompt string
sed_custom_prompt=$(<<<"$custom_prompt" sed 's/\\/\\\\/g')
# add this to /etc/bashrc for global effect
sed -i "s/PS1=.*/PS1='$sed_custom_prompt'/" testrc
exit 0
p.s. I personally like to add the time to the PS1 so I know how long ago a command is exited. Also, you can immediately time stuff if you add it (\D{%H}:\D{%M}).