logger

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طريقة الكتابة

logger [OPTION]... [MESSAGE]

الأكثر استخدامًا

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$ مستخدم عادي# بصلاحية root (أو مع sudo)

1. 1Write a simple message

   $logger "backup started"
   $journalctl -n 1
   Oct 25 11:05:12 server1 student[4410]: backup started

   The tag is your user name.

2. 2With a tag and priority

   $logger -t backup -p user.err "backup failed: disk full"

   Easy to find with journalctl -t backup -p err.

3. 3Test an rsyslog rule

   #logger -p local4.warning "test for backup.log"
   #tail -1 /var/log/backup.log

   Proves the rule works.

4. 4Also show it on the screen

   $logger -s -t deploy "version 2.4 deployed"
   <13>Oct 25 11:06:01 deploy: version 2.4 deployed

   -s prints to stderr too.

5. 5Log a whole file

   $logger -t import -f /var/tmp/import-report.txt

   One log line per file line.

6. 6Log from a script

   $logger -t myscript -p user.info "$(date +%F) cleaned $(find /var/tmp -mtime +7 | wc -l) files"

   Your script results in the central logs.

7. 7Send to a remote syslog server

   $logger -n logserver.example.com -T -P 514 -t test "remote test"

   Check that the log server receives messages.

8. 8Log the result of a command

   $dnf -y upgrade >/dev/null 2>&1 && logger -t patch "upgrade OK" || logger -t patch -p user.err "upgrade FAILED"

   Success or failure in the log.

9. 9Pipe output into the log

   $df -h / | logger -t diskcheck

   Every line becomes a log entry.

10. 10Mark tests in security monitoring

    $logger -t soc-test "SIEM detection test 2026-10-25"

    Test that your SIEM gets and alerts on messages.

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