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.

Linux Commands Cheatsheet

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

Example

To find every .log file under the current directory and search its contents, you would chain two commands from the sheet:

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

find walks the directory tree by filename; grep -r scans file contents recursively. Click Copy next to either to paste it straight into your terminal. Everything runs in your browser — nothing you type or copy is sent anywhere.