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#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
without-env ENVVAR PATH -- COMMAND...
without-env [-h]
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
Examples:
Execute "command -V" filtering ~/bin, to get where "w3m" is
in $PATH, other than ~/bin:
$ without-env PATH ~/bin -- command -v w3m
Compile foo.c, excluding ~/.local/include
from $C_INCLUDE_PATH:
$ without-env C_INCLUDE_PATH ~/.local/include -- cc -co foo.o foo.c
EOF
}
for flag in "$@"; do
case "$flag" in
--)
break
;;
--help)
usage
help
exit
;;
*)
;;
esac
done
while getopts 'h' flag; do
case "$flag" in
h)
usage
help
exit
;;
*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
assert_arg() {
if [ -z "$1" ]; then
printf 'Missing %s\n' "$2" >&2
exit 2
fi
}
assert_arg "${1:-}" 'ENVVAR'
assert_arg "${2:-}" 'PATH'
assert_arg "${3:-}" '--'
eval "export $1=\"\$(echo \"\$$1\" | sed \"s|\$2:||g\")\""
shift # drop $1
shift # drop $2
shift # drop --
"$@"
|
