Delete Set public Set private Add tags Delete tags
  Add tag   Cancel
  Delete tag   Cancel
  • • DevOps notes •
  •  
  • AI
  • Tags
  • Login

Systemctl, process management/shaare/VSEluw

  • linux
  • linux

Basic System Info Commands

  • uptime → time, uptime, users, load average
  • hostname → current hostname
  • ip hostname → show IP & hostname
  • uname -a → current OS and kernel info
  • which command → path to a command
  • cal → calendar for current month/year

    • cal 2025 → full year
  • bc → basic calculator

System Monitoring

  • systemctl → interact with systemd system manager
  • ps → view current processes
  • top → dynamic view of process usage

Systemctl Usage

  • systemctl start|stop|status servicename.service → manage service state
  • systemctl enable servicename.service → start service at boot
  • systemctl restart|reload servicename → restart or reload service
  • systemctl list-units --all → list all units
  • To add a service:

    • Create a unit file in /etc/systemd/system/servicename.service

Process Management

  • Start a process in the background:

    • Ctrl + Z then jobs → suspend and background
    • bg → continue in background
    • fg → bring back to foreground
  • Run process detached from terminal:

    • nohup process & → keep running after logout
    • nohup process > /dev/null 2>&1 & → suppress all logs/output

Killing and Prioritizing

  • pkill name → kill process by name
  • nice → start process with a priority (range -20 to 19)

    • lower = higher priority
    • nice -20 top

Jobs Monitoring

  • jobs → list background/foreground job states
3 months ago Permalink
cluster icon
  • 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...
  • System information, root recovery, environment variables, shortcuts : Finding System Information cat /etc/redhat-release → Red Hat version uname -a → Linux hostname, kernel, architecture dmidecode → hardware, BIOS, syst...
  • Basic File Commands / File Search Commands : touch one two three → Create 3 files mkdir folder → Make directory mv -R / cp -R → Move or copy folder including subfolders find . -name "geor...
  • Alias Setup : alias l="ls -al" → define alias unalias l → remove alias Persistent Alias Config User-specific: ~/.bashrc Global: /etc/bashrc Add: alias l="ls -a...
  • Special Permissions (SetUID, SetGID, Sticky Bit) : chmod u+s xyz.sh → add SetUID (user-level special permission) chmod g+s xyz.sh → add SetGID (group-level special permission) chmod u-s xyz.sh → remov...


(19)
Filter untagged links
Fold Fold all Expand Expand all Are you sure you want to delete this link? Are you sure you want to delete this tag? The personal, minimalist, super-fast, database free, bookmarking service by the Shaarli community