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#!/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 |
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