I have a string made up of directories with a space after each one
dirs="/home /home/a /home/b /home/a/b/c"
the following code deletes the last directory in the string.
dirs=${dirs% * }
This works in all cases except when only one directory is in the string, then it doesn't delete it because it doesn't have a space before it.
I'm sure there's an easy way to fix this, but i'm stuck.
I'd prefer a one line method without if statements if possible.
thanks
$ dirs="/home /home/a /home/b /home/a/b/c"
$ dirsa=($dirs)
$ echo "${dirsa[@]::$((${#dirsa[@]}-1))}"
/home /home/a /home/b
$ dirs="${dirsa[@]::$((${#dirsa[@]}-1))}"
$ echo "$dirs"
/home /home/a /home/b
$ dirs="/home"
$ dirsa=($dirs)
$ dirs="${dirsa[@]::$((${#dirsa[@]}-1))}"
$ echo "$dirs"
Or, you know, just keep it as an array the whole time.
$ dirs=(/home /home/a /home/b /home/a/b/c)
$ dirs=("${dirs[@]::$((${#dirs[@]}-1))}")
$ echo "${dirs[@]}"
/home /home/a /home/b
${#dirs[@]} gives you the length of the array. ${dirs[@]::} slices the array. So, it slices the last element off the array.First, delete any non-spaces from the end; then, delete any trailing spaces:
dirs="/home /home/a /home/b /home/a/b/c"
dirs="${dirs%"${dirs##*[[:space:]]}"}" && dirs="${dirs%"${dirs##*[![:space:]]}"}"
echo "$dirs"
I'm sure someone will provide something better, but
case "$dirs" in (*" "*) dirs="${dirs% *}" ;; (*) dirs="" ;; esac
$ dirs="/home /home/a /home/b /home/a/b/c"
$ [[ $dirs =~ '(.*) (.[^ ]*)$' ]]
$ echo ${BASH_REMATCH[1]}
/home /home/a /home/b
$ dirs="/home"
[[ $dirs =~ '(.*) (.[^ ]*)$' ]]
$ echo ${BASH_REMATCH[1]}
