This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/env bash | |
if [ "$#" -ne 3 ]; then | |
echo "Usage: ./copies [source-file] [dest-dir] [seconds-between-checks]" >&2; exit 1 | |
fi | |
SRC=$1 | |
DEST=$2 | |
SECS=$3 | |
if ! [ -f "$SRC" ]; then | |
echo "No source-file found at $SRC" >&2; exit 1 | |
fi | |
BASE=`basename $SRC` | |
if ! [ -d "$DEST" ]; then | |
echo "No dest-dir found at $DEST" >&2; exit 1 | |
fi | |
RE='^[0-9]+$' | |
if ! [[ $SECS =~ $RE ]]; then | |
echo "seconds-between-copies not a number" >&2; exit 1 | |
fi | |
echo "Copying new versions of $SRC to $DEST/[timestamp].$SRC every $SECS seconds." | |
echo "Use CTRL-C to stop." | |
echo | |
LAST="" | |
for (( ; ; )) | |
do | |
STAMP=`date -u +"%Y-%m-%d.%H-%M-%S."` | |
STAMPED_DEST="$DEST/$STAMP$BASE" | |
if [ -z "$LAST" ] || ! $(cmp --silent "$SRC" "$LAST"); then | |
echo "Changed: cp $SRC $STAMPED_DEST" | |
cp $SRC $STAMPED_DEST | |
LAST=$STAMPED_DEST | |
else | |
echo "Unchanged" | |
fi | |
sleep $SECS | |
done |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment