Assign multi-line string to a shell variable or file

# to var
$ sql=$(cat <<EOF
SELECT foo, bar FROM db
WHERE foo='baz'

# file
$ cat <<EOF >> greetings.txt
line 1
line 2

switch to last directory / between directories

cd -

run last command


(in a bash script) force the script to fail, if any sub-command causes a non-zero exit code

set -e