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#!/bin/sh
die() {
echo "${0##*/}: error: $*" >&2
exit 1
}
usage() {
echo "Usage: foo [options] [args]
This does something useful!
Options:
-o <file> Write output to <file>
-v Run verbosely
-h This help screen"
exit 0
}
main() {
local flag
local verbose="false"
local out="/dev/stdout"
while getopts 'ho:v' flag; do
case ${flag} in
h) usage ;;
o) out="${OPTARG}" ;;
v) verbose="true" ;;
*) die "invalid option found" ;;
esac
done
if [[ ${verbose} == "true" ]]; then
echo "verbose mode is enabled!"
else
echo "will be quiet"
fi
if [[ -z ${out} ]]; then
die "-o flag is missing"
fi
echo "writing output to: '${out}'"
# Now remaining arguments are in "$@".
...
}
main "$@"Questions
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