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bip
executable file
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bip
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#!/bin/bash
me=`basename $0`
frequency=440
duration=0.5
volume=0.5
usage () {
# Call as: usage [EXITCODE] [USAGE MESSAGE]
exit_code=1
if [[ "$1" == [0-9] ]]; then
exit_code="$1"
shift
fi
if [ -n "$1" ]; then
echo "$*" >&2
echo
fi
cat <<EOF >&2
Usage: $me [options]
Options:
-f, --frequency=FREQUENCY in Hz [$frequency]
-d, --duration=DURATION in seconds [$duration]
-v, --volume=VOLUME as a fraction of 1 [$volume]
EOF
exit "$exit_code"
}
getopts () {
while [ -n "$1" ]; do
case "$1" in
-h|--help)
usage 0
;;
-f|--frequency)
frequency="$2"
shift 2
;;
-d|--duration)
duration="$2"
shift 2
;;
-v|--volume)
volume="$2"
shift 2
;;
*)
usage "Unrecognised option: $1"
;;
esac
done
}
getopts "$@"
play -n synth $duration sine $frequency vol $volume >/dev/null 2>&1