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September 16, 2019 14:11
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Smart file backup script
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#!/bin/bash | |
cd "$(dirname "$0")" | |
function limit { | |
COUNT=$(find . -name "*.tar.gz" | wc -l) | |
if (( $COUNT > $1)) | |
then | |
rm "$(ls -t | tail -1)" | |
limit $1 | |
fi | |
} | |
function cleanup { | |
LIMIT=$(cat .limit) | |
limit "$LIMIT" | |
} | |
function changed { | |
LATEST_FILE=$(ls -rt | tail -1) | |
if [ -z $LATEST_FILE ]; | |
then | |
echo 1 | |
else | |
A_CONTENTS=$(tar -tvf $1 | sort) | |
B_CONTENTS=$(tar -tvf $LATEST_FILE | sort) | |
diff <(echo "$A_CONTENTS") <(echo "$B_CONTENTS") | wc -l | |
fi | |
} | |
pushd $1 | |
BACKUP_TMP_FILE=$(mktemp) | |
BACKUP_FILE=$(tar -zcvf "$BACKUP_TMP_FILE" $2) | |
DATE=$(date '+%Y-%m-%d_%H-%M') | |
BACKUP_NAME="$DATE.tar.gz" | |
CHANGED=$(changed "$BACKUP_TMP_FILE") | |
if (( $CHANGED > 0 )) | |
then | |
echo "Differences found, saving backup" | |
mv "$BACKUP_TMP_FILE" "$BACKUP_NAME" | |
cleanup | |
else | |
echo "No differences found" | |
fi | |
popd |
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