How do I find a file by name in Linux?

Use find . -name "*.log" to search the current directory and everything below it for files matching a pattern. To search file contents instead, use grep -r "text" . to scan recursively.

What does chmod 644 mean?

It sets read and write for the file owner, and read-only for the group and everyone else. The three digits are octal permission bits for owner, group and others.

Is anything I search or copy uploaded?

No. The entire cheatsheet and search run in your browser, so nothing you type or copy is sent anywhere.

How do I check disk space on Linux?

Use df -h to see free space per filesystem in human-readable units, and du -sh * to see the size of each item in the current directory. Both are in the cheatsheet under processes and system.

How do I copy a file to a remote server?

Use scp file.txt user@host:/path/ to copy over SSH, or rsync -avz local/ user@host:/remote/ for efficient, resumable transfers of whole directories.

How do I see which process is using a port?

Run ss -tulpn (or the older netstat -tulpn) to list listening sockets with their process IDs, then kill the process by PID if needed. These are in the networking section.

How do I make a file executable?

Run chmod +x script.sh to add execute permission for everyone, or chmod 755 script.sh to set read/write/execute for the owner and read/execute for group and others.

What is the Linux Commands Cheatsheet?

A searchable Linux commands cheatsheet covering files, viewing and searching, permissions, processes, networking, archives and pipes. Copy any command with one click. Runs entirely in your browser, nothing is uploaded. It runs free in your browser on Gera Tools, with nothing uploaded.

Linux Commands Cheatsheet

Name: Linux Commands Cheatsheet
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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This is a searchable quick reference of the everyday Linux terminal commands, organised by task so you can find the right one without leaving your browser. It is aimed at developers, sysadmins and anyone learning the shell who wants a fast lookup rather than wading through man pages. Every entry has a plain-English description and a one-click copy button.

How it works

The commands are grouped into six categories and rendered as a single client-side list. As you type, the sheet filters live — matching against both the command text and its description — so searching “disk space” surfaces df -h even though those words are not in the command itself. There is no server lookup; the whole cheatsheet ships with the page and filtering is a local string match.

Category	Typical commands
Files & directories	ls, cd, cp, mv, rm, mkdir
Viewing & searching	cat, less, grep, find, head, tail
Permissions & ownership	chmod, chown, umask
Processes & system	ps, top, kill, df, du, free
Networking & transfer	ssh, scp, rsync, curl, ss
Archives & pipes	tar, gzip, zip, xargs, tee

High-frequency commands worth knowing cold

find . -name "*.log" -mtime -7 — find log files modified in the last 7 days, which is faster than searching everything when you know the approximate age.

grep -rn "ERROR" . --include="*.log" — recursive search with line numbers, filtered to only log files.

df -h && du -sh * — one-liner to check both filesystem-level and directory-level disk use in the same command.

ps aux | grep myprocess — combine the full process list with a filter to find a named process quickly.

tar -czf backup.tar.gz /path/to/dir — create a compressed archive in one command; c creates, z compresses with gzip, f sets the filename.

Worked example

To find every .log file under the current directory and search its contents:

find . -name "*.log"
grep -r "ERROR" .

find walks the directory tree by filename; grep -r scans file contents recursively. To do both in one pass — find files then search them — chain with xargs:

find . -name "*.log" | xargs grep "ERROR"

Click Copy next to any command to paste it straight into your terminal. Everything runs in your browser — nothing you type or copy is sent anywhere.

Common flags to memorise

ls -lah — long listing, all files (including hidden), human-readable sizes
chmod +x — add execute for all; chmod 600 — private files
rsync -avz --delete — sync with verbose output, compression, and removal of deleted files
kill -9 PID — force-kill when a process ignores normal signals; use kill PID first