cheat-fork-echo/cheat/cheatsheets/bash

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# To implement a for loop:
for file in *;
do
echo $file found;
done
# To implement a case command:
case "$1"
in
0) echo "zero found";;
1) echo "one found";;
2) echo "two found";;
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3*) echo "something beginning with 3 found";;
esac
# Turn on debugging:
set -x
# Turn off debugging:
set +x
# Retrieve N-th piped command exit status
printf 'foo' | fgrep 'foo' | sed 's/foo/bar/'
echo ${PIPESTATUS[0]} # replace 0 with N
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# Lock file:
( set -o noclobber; echo > my.lock ) || echo 'Failed to create lock file'