How to have Bash to do case insensitive operation on test:
$ n=Foo
$ [ -e "$n" ] && echo $n exist
foo exist
if it is:
$ ls
foo bar baz
How the correct setting ?
To have Bash to do case insensitive operation on a test
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2 Answers
You can also use bash case insensitive global matching pattern :
$ shopt -s nocaseglob
$ shopt -s nocasematch
$ n=Foo
$ f=("$n"*)
$ [ "${f[0]/$n/}" = "" ] && echo ${f[0]} exist
foo exist
But take care that to have a conditional test matching a pattern and not directly a filename with f=("$n"*), we use here a *. With that, you'll get a wrong result if there is pattern symbols like * or ? in $n.
You have also to carefully consider the global effect of shell options (shopt -s nocaseglob, shopt -s nocasematch). Generally, to avoid unexpected behaviors in any following shell commands / scripts, you have to restore initial states of theses options. Check and store the initial state with shopt option to restore it later.
Use ipath in find.
if tmp=$(find . -maxdepth 1 -ipath "./$n") && [[ -n "$tmp" ]]; then
echo "$n exists and there are:" $tmp
fi
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