linux

• commands
• step-by-steps

journalctl

1. How to Check and Clean Up Journal Logs

• check logs

$ systemctl is-active systemd-journald
$ journalctl
$ journalctl --boot
$ journalctl --since "1 hour ago"
$ journalctl --since "2023-01-01" --until "2023-01-02"
$ journalctl -u sshd
$ journalctl -u sshd | grep error
$ journalctl -u sshd | grep stopped
$ journalctl -u sshd | grep topped
$ journalctl --disk-usage

• cleanup logs

$ journalctl --vacuum-time=200d

Checking Disk Usage, df, du, ls -lh

du
df
ls

find

find . -name "filename"
find . -name "*.txt"
find . -size +100M
find . -size -1k
find . -mtime -7
find . -mtime +30
find . -type d
find . -type f
find /var/log -name "*.log"
find . -name "*.tmp" -exec rm -f {} \;
find . -name "*.txt" -exec ls -lh {} \;
find . -perm 644
find . -perm /o=w
find . -name "*.log" -size +50M
find . -mtime -7 -user root
find . -name "*.txt" | wc -l