コマンドがエラーになった場合にシェルスクリプトを即時に終了させる

-e Exit immediately if a simple command (see SHELL GRAMMAR above) exits with a non-zero status. The shell does not exit if the command that fails is part of the command list immediately following a while or until keyword, part of the test in an if statement, part of a && or || list, or if the com- mand's return value is being inverted via !. A trap on ERR, if set, is executed before the shell exits.

$ ./example.sh foo trap err trap exit