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#!/bin/sh
# Substitute a string in many files. By Serge van den Boom, 20020826
# We need bash functionality. Executing bash with the shebang won't be
# portable as the location of bash differs.
if [ -z "$BASH_VERSION" ]; then
exec bash "$0" "$@"
fi
if [ $# -eq 0 ]; then
{
echo "subst: substitute a string in a lot of files."
echo "By Serge van den Boom, 20020826"
echo "Usage: subst <pattern> <file> [...]"
echo -n "'pattern' should be a pattern in the form used by sed, "
echo " like 's/old/new/g'."
} 1>&2
exit 1
fi
PAT="$1"
SEP="${PAT:1:1}"
GREPPAT="${PAT:2}"
eval GREPPAT='${GREPPAT%%'$SEP'*}'
shift
while [ "$#" -gt "0" ]; do
FILE="$1"
echo -n "$FILE: "
grep -q "$GREPPAT" < "$FILE"
EXITVAL=$?
case $EXITVAL in
0) # Match found
;;
1) # No match found
echo "Nothing to do."
shift
continue
;;
*)
echo "ERROR"
echo "Error: grep returned exit value ${EXITVAL}. Aborted." 1>&2
exit 1
esac
TEMPFILE="${FILE}.patchtree.$$.tmp"
mv -- "$FILE" "$TEMPFILE"
sed -e "$PAT" < "$TEMPFILE" > "$FILE"
rm -- "$TEMPFILE"
echo "Done."
shift
done
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