26 lines
765 B
Bash
26 lines
765 B
Bash
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#!/bin/bash
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# added sudo crontab to the pi to trim old data at 2 am:
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# 0 2 * * * /bin/bash /home/YOURPIUSER/nfc/clean_old_logs.sh >/dev/null 2>&1
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TIMES_FILE="/home/YOURPIUSER/nfc/times.csv"
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# 1. Get the date 6 months ago (for testing)
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LOG_CUTOFF=$(date -d "6 months ago" +%Y-%m-%d)
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# 2. Filter using universally compatible literal matching
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awk -v cutoff="$LOG_CUTOFF" '
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{
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if (match($0, /[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]/)) {
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date_part = substr($0, RSTART, RLENGTH)
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if (date_part < cutoff) {
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next
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}
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}
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print $0
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}' "$TIMES_FILE" > "${TIMES_FILE}.tmp"
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# 3. Safely replace the file
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mv "${TIMES_FILE}.tmp" "$TIMES_FILE"
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# 4. Force the sync script to grab the new file inode
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systemctl restart nfc-sync.service
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