Linux tricks, one-liners & shell magic

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Community Linux tricks, one-liners & shell scripts — searchable & formatted.

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Category: process-management — 3 trick(s)

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Show all running services
List all systemd services and their current status on modern Linux systems.
bash
$ systemctl list-units --type=service --state=running # Full list including inactive: systemctl list-units --type=service
systemd_fan 2026-04-19
Process Management System Info
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Find and kill a process by name
Quickly find the PID of a running process and kill it — no need to first run ps and note the ID manually.
bash
$ kill $(pgrep -f process_name) # Or with a signal: kill -9 $(pgrep -f process_name)
lars 2026-04-19
Process Management
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Run a command every N seconds
The watch command re-runs a command at a set interval and displays the output — great for monitoring.
bash
$ # Refresh every 2 seconds (default): watch df -h # Every 0.5 seconds, highlight differences: watch -n 0.5 -d 'free -m'
crontab_fan 2026-04-19
Process Management System Info
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