Cheat sheet
Slow Linux server checklist
The first minutes on a slow Linux server: load, CPU, memory, disk I/O, network and the kernel log, with what each number means.
// cheat sheet
Cheat sheets
Compact, regularly updated references for the tools I use every day.
Cheat sheet
sort and uniq cheat sheet
Sort lines by number, size, version or a single column, remove or count duplicates, and rank the most common values with sort and uniq.
Cheat sheet
ssh cheat sheet
SSH keys, config, jump hosts, port forwarding, scp and sshd hardening: the commands and settings I use on every server.
Cheat sheet
systemctl cheat sheet
Manage systemd services with systemctl: status, restarts, enabling at boot, drop-in overrides, dependencies, timers and user services.
Cheat sheet
tar cheat sheet
Create, list, extract and compress archives with tar: the flags I actually use, with gzip, xz and zstd.
Cheat sheet
tee cheat sheet
Save a command's output to a file while still passing it on: logging long jobs, writing root-owned files with sudo, and splitting a stream to several places.
Cheat sheet
Text processing one-liners
Slice and reshape text on the command line with cut, tr, paste, column, comm, join, sort and awk: columns, CSV, joins and set operations.
Cheat sheet
tmux cheat sheet
Keep SSH sessions alive and split your terminal with tmux: sessions, windows, panes, copy mode, the commands I use and a minimal config.
Cheat sheet
xargs cheat sheet
Turn lines of input into command arguments with xargs: safe handling of spaces, one command per item, placeholders, parallel jobs and dry runs.
