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7 hours ago Permalien
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  • SED: Stream Editor for Text Manipulation : Basic Replace Syntax: sed -i 's/KENNY/LENNY/g' filename Substitute all occurrences of "KENNY" with "LENNY" Delete Line Containing String: s...
  • NTP and Mail : NTP / Chronyd → Time Synchronisation nano /etc/chrony.conf → edit conf systemctl start chronyd systemctl enable chronyd chronyc → interactive cmd t...
  • Disk usage, logging, shutdown, hostname : Disk and Memory Info df → disk partition info df -h → human-readable format du → size of file/directory free → memory info cat /proc/cpuinfo → CPU in...
  • SSH and DNS : SSH ps -ef | grep sshd → check ssh systemctl status sshd DNS PTR record → IP to hostname A record → hostname to IP CNAME record → hostname to...
  • Linux File Ownership, ACLs, and I/O Redirects : File Ownership chown → Change ownership chgrp → Change group Access Control List (ACL) setfacl → Set file ACL getfacl → Get file ACL Add Permissi...


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