pjs/testing/sisyphus/bin/combo.sh

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#!/bin/bash -e
delim=,
while getopts "d:" optname;
do
case $optname in
d) delim=$OPTARG;;
esac
done
if [[ $OPTIND -gt 1 ]]; then
shift 2
fi
if [[ -n "$4" ]]; then
for a in $1; do for b in $2; do for c in $3; do for d in $4; do echo $a$delim$b$delim$c$delim$d; done; done; done; done
elif [[ -n "$3" ]]; then
for a in $1; do for b in $2; do for c in $3; do echo $a$delim$b$delim$c; done; done; done
elif [[ -n "$2" ]]; then
for a in $1; do for b in $2; do echo $a$delim$b; done; done
elif [[ -n "$1" ]]; then
for a in $1; do echo $a; done
else
cat<<EOF
usage: combo.sh [-d delim] list1 [list2 [list3 [list4]]]
output combinations of items in each list using delim as the delimiter
-d delim specifies the delimiter. The default is comma (,).
$combo.sh "a b"
a
b
combo.ah "a b" "1 2"
a,1
a,2
b,1
b,2
combo.ah -d "-" "a b" "1 2"
a-1
a-2
b-1
b-2
EOF
fi