Crucifix Arnaud

Unix

Some unix command and other ressources, in case of.

Cheatsheet:

Help:

- man {command}: Display manual for command
- {command} --help: Display quick help for command (sometime -h does work also)

Directory navigation:

- cd {path}: Go to path
- cd ~: Go to home directory
- cd ..: Go up one directory
- pwd: Print working directory

File listing:

- ls {path}: List file(s) in {path} (current directory if no path specified)
- ls -l: List files with details (date, size, permissions)
- ls -a: List all files, including hidden files
- ls -R: Recursively list subdirectories

View file content:

- cat {fileName}: Display the content of fileName
- tail {fileName}: Display the last lines of fileName (usefull for long files)

Files and directories manipulation:

- touch {fileName}: Create an empty file called fileName
- echo "some text" > {fileName}: Create (or overwrite) a fileName with content "some text" 
- echo "some text" >> {fileName}: Append "some text" to the end of fileName

- mkdir {directoryName}: Create a directory called directoryName
- mkdir -p: Create chain directory (e.g. mkdir -pv dir1/dir2/dir3)

- mv {fileName} {newFileName}: Rename fileName to newFileName
- cp {fileName} {newFileName}: Copy fileName in newFileName
- cp -r {directoryName} {newDirectoryName}: Copy directoryName in newDirectoryName

- rm {fileName}: Delete fileName
- rm -r {directoryName}: Delete directoryName

Files and directories permissions:

- chown {user}:{group} {fileName}: Change owner of fileName to user:group
- chmod {permissions} {fileName}: Change permissions of fileName to permissions

Process management:

- ps -aux: List all processes 

- kill {pid}: Kill process with id pid
- kill -9 {pid} : Force kill process with id pid

Various

- where {command}: Display location(s) of command
- which {command}: Display currently used path of command

- clear: Clear terminal screen

General considerations:

Optional flags can be combined.

ls -la: List all files with details

Command can be chained (pipe).

ls -la | grep "file.txt": List all files with details and filter for file.txt

Links