bash.md

loop

for file in *; do
    echo $file;
done

case

case "$1"
in
    0) echo '$1==0';;
    1) echo '$1==1';;
    3*) echo '$1==3…' "($1)";;
esac

Retrieve N-th piped command exit status

printf 'foo' | fgrep 'foo' | sed 's/foo/bar/' echo ${PIPESTATUS[0]} # replace 0 with N

Lock file:

( set -o noclobber; echo > my.lock ) || echo 'Failed to create lock file'

Export variables from an environ file

export $( grep -v '^\s*\(#\|$\)' /path/to/envvars | xargs )

scoping is broken

myfunc() {
    myfunc() {
        echo redefined myfunc;
    };
    echo first myfunc;
};