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Search rotated and compressed logs too

harmless rootLogsdebian, ubuntu
Adjust the values, the command updates live
root@server
zgrep -h "Out of memory" /var/log/syslog*

zgrep works like grep but automatically decompresses .gz files and reads normal files as they are. The * at the end covers the current file, .1 and all .gz archives. -h omits the file name before each matching line; without that option you can see which rotation a match comes from.

Note: The files are processed in alphabetical order, not chronologically. Sort the output afterwards if you need a time-based order.

Also searched as

  • search old gz logs
  • grep compressed log files
  • grep in rotated logs
  • search last week's logs

Related one-liners

All in Logs

Find the largest log files on the server

#du -ah /var/log 2>/dev/null | sort -rh | head -20
harmlessLogs

Force log rotation immediately

#logrotate -vf /etc/logrotate.d/nginx
cautionLogs

Test a logrotate configuration without rotating

#logrotate -d /etc/logrotate.d/nginx
harmlessLogs

Check whether a website serves gzip or Brotli

$curl -s -o /dev/null -D - -H "Accept-Encoding: br, gzip" https://example.com/ | grep -i "^content-encoding"
harmlessnginx

Create a compressed tar backup with the date in the name

#tar -czf /var/backups/example.com-httpdocs-$(date +%F).tar.gz -C /var/www/vhosts/example.com/httpdocs .
cautionrsync and backup

Find a file by name

$find /var/www/vhosts -iname '*wp-config*' 2>/dev/null
harmlessFilesystem

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