Lock file

cheat/cheatsheets/bash

@@ -22,3 +22,6 @@ set +x
 # 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'