bash-boilerplate.sh

#!/usr/bin/env bash

# Immediately exit this script if ..
#  any internal command exits with non-zero status
set -o errexit
#  any unbound variables are used
set -o nounset
#  any pipe fails
set -o pipefail

# Helper functions: logmsg and end_script
# Helper variables:
#     __PID__  This script's process ID
#     __DIR__  This script's directory i.e. /foo/bar
#     __BASE__ This script base name without the ".sh" extension. i.e. baz
#     __FILE__ Absolute path this file i.e. /foo/bar/baz.sh
#     __TAG__  Stripped down version of __BASE__ . Slug-like string.

__PID__=$$
__DIR__="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
__BASE__="$(basename "${BASH_SOURCE[0]}" .sh)"
__FILE__="${__DIR__}/$(basename "${BASH_SOURCE[0]}")"

__TAG__="$(echo "${__BASE__}" | sed 's/[^a-zA-Z0-9_]/\-/g; s/^-*//g; s/-*$//g; s/--/-/g;')"
PID_FILE="${__TAG__}.pid"
for D in /var/run /var/local/run /tmp;
do
    if [[ -w ${D} ]]; then
        export PID_FILE="${D}/${__TAG__}.pid"
        break
    fi
done

arg1="${1:-bob}"

echo "arg1=|$arg1|"