stargazing/notwa-util/shed

#!/usr/bin/env sh
: \
 && f="${1?missing filename}" && shift \
 && for e in "$@" \
    ;do : \
     && { cp "$f" "$f.bak" || exit ;} \
     && sed -i -e "$e" "$f" \
     && { diff -q "$f" "$f.bak" >/dev/null; x=$?; rm "$f.bak" || exit ;} \
     && [ $x = 1 ] \
     || { printf >&2 '\033[91mfailed to apply sed:\033[m\n%s\n' "$e"; exit 1 ;} \
    ;done \
;