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Customising the BASH prompt
intro:
The Unix BASH shell is customisable. This covers one way of setting your PS1 so it doesn't get too long when in a deeply nested file hiearchy. It assumes you already know what PS1 is etc.
subject:
bash PS1 prompt customisation
content:
Create a file called e.g. ~/bin/prompt :
#!/bin/bash
LENGTH="50"
HALF="$(($LENGTH/2))"
if [ ${#PWD} -gt $(($LENGTH)) ]; then
echo "${PWD:0:$(($HALF-3))}...${PWD:$((${#PWD}-$HALF)):$HALF}" | \
sed s/\\/home\\/$USER/~/
else
echo "$PWD" | sed s/\\/home\\/$USER/~/
fi
You'll note from the above that if your prompt length is greater than $LENGTH, it is truncated (snipping a bit out of the middle). This stops the prompt from becoming too unwieldy.
To use it, edit your ~/.bashrc and include something like :
export PS1='[\u@\h:$($HOME/bin/prompt)]\$ '
Giving something like :
[david@fitz:/tmp/abcdefghijklmnopq...bcdefghijklmnopqrstuvwxyz]$ pwd
/tmp/abcdefghijklmnopqrstubvwxyz01234567890/abcdefghijklmnopqrstuvwxyz
Obviously you can change the length value in the prompt command to reduce or increase this limit as necessary.
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Comments
Instead of sed
Instead of
sed s/\\/home\\/$USER/~/
I'd suggest:
sed "s|/home/$USER|~|"
Or even (since on my machine my homedir is /user/home/$USER :
sed "s/$HOME/~/"
To ensure that it doesn't match such things in the middle of the string, then change to
sed "s/^$HOME/~/"
Finally an improvement would be if the homedir substitution was done
automatically BEFORE the LENGTH decision was taken (also means
that above code I ave just shown appears just the once)
I'll leave that as an exercise for the reader!
enjoy
JK
Thanks
This is exactly the solution I was looking for. Thanks!
Hello, As I use many
Hello,
As I use many terminals in different windows size, i'd like the prompt truncation to fit the terminal's size. Here are the modified code.
in .bashrc:
shopt -s checkwinsize #bash ENV contains COLUMNS variable
export PS1='\u@\h:$($HOME/bin/prompt $COLUMNS) $ '
in $HOME/bin/prompt:
#!/bin/bash
MINLENGTH=55
if [ $MINLENGTH -lt $1 ]; then
LENGTH=$(($1-$MINLENGTH))
else
LENGTH=$MINLENGTH
fi
HALF="$(($LENGTH/2))"
if [ ${#PWD}...
++
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