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|
#! /bin/sh
#
# magic NAME create FILE < CONTENT
# magic NAME update FILE < CONTENT
# magic NAME destroy FILE
#
bs="# begin krebs magic <$1>"
es="# end krebs magic <$1>"
has() {
grep -q "^$bs$" $3 && grep -q "^$es$" $3
}
create() {
destroy "$@"
cat>>$3<<EOF
$bs
`cat`
$es
EOF
}
retrieve() {
sed -n "/^$bs$/,/^$es$/p" $3 | sed '1d;$d'
}
update() {
! has "$@" || create "$@"
}
destroy() {
if has "$@"; then
cache="`cat $3`"
echo "$cache" | sed "/^$bs$/,/^$es$/d" >$3
fi
}
case $2 in
(create) create "$@" ;;
(retrieve) retrieve "$@" ;;
(update) update "$@" ;;
(destroy) destroy "$@" ;;
(*)
echo 'Error 1: You are made of stupid!' >&2
exit 23
esac
|
