Linux Troubleshooting Cheat Sheet

2 pages · 19 commands

  1. 1
    systemd & journalctl
    10 commands · verified systemd 255 (255.4-1ubuntu8.17), flags verified via `systemctl --help`, `journalctl --help`, and `man systemctl`, 2026-08-21
  2. 2
    Network & Process Inspection
    9 commands · verified ss (iproute2, Ubuntu 24.04), lsof 4.95.0, strace 6.8, tcpdump 4.99.4, iptables 1.8.10 (nf_tables), nftables 1.0.9, dig/nslookup 9.18.39, sysstat (iostat) 12.6.1, vmstat (procps) — all flags verified via `<cmd> --help`/`<cmd> -h`, `man strace`, and `man nft` run locally; netstat verified via man7.org/linux/man-pages/man8/netstat.8.html only (net-tools not installed in this environment), 2026-08-21