Log parser

# Extract all timestamps from a log file
grep -oP '\d{10}' /var/log/app.log

# Convert all timestamps in a log to readable dates
grep -oP '\d{10}' /var/log/app.log | \
  while read ts; do
    echo "$ts -> $(date -d @$ts)"
  done

# Find log entries in a time range
awk -F'[][]' '{print $2}' access.log | \
  awk -F/ '{print $3"-"$2"-"$1}' | sort | uniq -c

# Parse nginx access log timestamps
awk '{print $4}' /var/log/nginx/access.log | \
  cut -c2- | sort | uniq -c

# Filter logs by date range using Unix timestamps
start=$(date -d "2024-12-01" +%s)
end=$(date -d "2024-12-07" +%s)
awk -v s=$start -v e=$end '$1>=s && $1<=e' timestamps.log