Bash signal trap template. Bashでよく使うシグナルトラップのテンプレート。

bash_trap_template.sh

#!/bin/bash
set -u # Check unset variables only
#set -ue # Check unset variables. Exit on error
LANG=C

# Trap signals
trap_HUP() {
    echo "Trap HUP signal."
    exit 1
}
trap_INT() {
    echo "Trap INT signal."
    exit 1
}
trap_TERM() {
    echo "Trap TERM signal."
    exit 1
}
trap_QUIT() {
    echo "Trap QUIT signal."
    exit 1
}
on_exit(){
    echo "Kill child processes on exit by 'pkill -P $$'"
    pkill -P $$
    echo "Exit."
}
on_error() {
    errcode=$?
    echo "error line $1: command exited with status $errcode."
}

trap 'trap_HUP' HUP
trap 'trap_INT' INT
trap 'trap_QUIT' QUIT
trap 'trap_TERM' TERM

# bash pseudo-signals
trap 'on_exit' EXIT
trap 'on_error $LINENO' ERR