Find process by name linux
List PIDs and full command lines matching a name
pgrep -la nginx
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Kill process tree
kill -TERM -$(pgrep -f 'my-app')
Change process priority
renice -n 10 -p <pid>
Limit process resources (cgroup)
systemd-run --scope -p MemoryMax=512M -p CPUQuota=50% -- ./heavy.sh
Query journald with time range
journalctl --since '2024-01-15 10:00' --until '2024-01-15 10:30' -u nginx
Export journald to JSON
journalctl -u <service> -o json | jq '{ts: .REALTIME_TIMESTAMP, msg: .MESSAGE}'