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Linux: Basic Shell Commands

This is a list of most frequently used linux commands.

These are essential commands. Most of them are used everyday by every linux user.

The code here are based on Ubuntu Linux, but 99% of them work in any unix, including Mac OS X.

Navigate Directory

  • ls в†’ list files in current directory
  • ls -al в†’ list all files in current dir, including dot files
  • ls -al | grep string в†’ show file name matching string
  • cd dirPath в†’ change directory
  • cd в†’ go to $HOME dir
  • cd .. в†’ go up one dir
  • pwd в†’ show the current dir

Many of these command’s argument can be either a file name (relative to current directory), or a full file path. For example, ls /usr/local/bin

You can set bash to show current dir path and time in your prompt.

File/Directory Manipulation

  • touch fileName в†’ create a new file, or update timestamp of the file if it exists already.
  • rm fileName в†’ delete a file
  • rm -r dirName в†’ delete a directory. (careful!)
  • cp fileName newFileName в†’ copy a file
  • cp -r dirName newName в†’ copy a dir
  • mkdir newDirName в†’ create a new dir
  • rmdir dirName в†’ delete a dir only if it is empty
  • mv fileName newName в†’ rename file, or move to a diff dir.
  • du -sh dirName в†’ show dir size. [see Linux: Show Directory Size: du]

Viewing Files

  • cat fname в†’ display file content
  • cat fname | more в†’ view a file by page. Type q to exit. Type h for other keys.
  • vi fname в†’ view a file. Type Escape : q to exit. [see vim Basics]
  • head fname в†’ view the first few lines of a file. (most useful for big files, e.g. log file.)
  • tail fname в†’ view the last few lines of a file.
  • tail -f fname в†’ view the last few lines of a growing file, updated continuously. Typically used on log files.
  • file fname в†’ report what type of file it is. (For example, text, jpg, png, pdf, ….)

Locating Commands

  • type cmd в†’ show if cmd is a shell built-in or standalone program. For example, type kill . The command type is a built-in bash command, not a standalone shell util. Try type type
  • which cmd в†’ show full path of a command, useful for checking if a program is installed (if it’s in the search path in $PATH environment variable.)
  • man cmd в†’ view documentation of a command. q to exit. h for help.
  • apropos string в†’ search man pages.
  • locate fname в†’ find a file by name (using the database see man updatedb ). This is similar to find dir_paths -name “* fname *” but much faster.
  • updatedb в†’ update the database used by locate . (this is done automatically. Useful only if you just installed bunch of new commands.)

Linux find executable files by searching the $PATH environment variable. Try echo $PATH . It is a list of dir paths. They are searched in order.

Excutable files must have executable bits on. That is, the “x”. For example, type ls -l /usr/bin to see them. [see Linux: File Permission System]

Install Program/Package

The following are for Ubuntu Linux.

  • apt-cache search name в†’ find package name for install by “apt-get”
  • apt-cache show name в†’ describe package name
  • apt-get install name в†’ install a new program. (usually used with sudo in front)
  • apt-get remove name в†’ remove (un-install) a program.
  • apt-get purge name в†’ remove a program and its config files.
  • dpkg -l в†’ list all installed packages
  • apt-get update в†’ sync package index files from sources. (need to do this regularly)
  • apt-get upgrade в†’ upgrade all installed packages to latest versions (if any).
  • apt-get dist-upgrade в†’ update OS kernel, and others.

To install and compile a new command, here’s the typical steps:

  • uname -a в†’ print your OS info.
  • df –si в†’ print disk usage.

Archive, Compression
  • tar cvf newName.tar dirPath в†’ tar up a dir.
  • tar xvf fileName.tar в†’ untar.
  • zip -r newName.zip dirName в†’ zip a dir
  • unzip fileName в†’ unzip
  • gzip fileName в†’ Compress a file.
  • gzip -d fileName в†’ Decompress a file.
  • bzip2 fileName в†’ Compress a file.
  • bzip2 -d fileName в†’ Decompress a file.
  • xz fileName в†’ Compress a file.
  • xz -d fileName в†’ Decompress a file.

Text Processing

  • Linux: Text Processing: grep, cat, awk, uniq
  • Linux: Shell Command Examples: find, xargs

Version Control

  • git Tutorial
  • svn Tutorial

Fetching and Sync Remote Files: rsync, unison, wget, curl

  • Linux: Sync Across Machines, rsync
  • Linux: Download Website: wget, curl

Managing Process

  • ps -ef в†’ view running processes
  • ps -ef | grep name в†’ find a particular process
  • kill pid в†’ quit a program that has process id pid
  • kill -s 9 pid в†’ force quit a process
  • top в†’ monitor processes with continuous update. q to quit. [see Linux: Monitor Processes: top]
  • pstree в†’ show the process parent-child relationship

A better program for monitoring processes than “top” is “htop”. [see Linux: Monitor Processes, htop]

Job Control

Sys Admin

  • sudo commandString в†’ run a command as “root” (“root” is the name of default admin account.)
  • su в†’ switch to “root”
  • sudo su root в†’ switch to “root”. (useful when root isn’t setup as a login account. For example, default Ubuntu)
  • chmod 664 fileName в†’ change the perm bits. (664 = rw-rw-r– ; typical text file perm bits)
  • chown userName fileName в†’ change owner of a file.
  • chgrp groupName fileName в†’ change the group of a file.
  • ln -s newPath existingPath в†’ make a symbolic link (aka soft link) of a file. (symbolic link is basically a file path.)
  • ln newPath existingPath в†’ create hard link of a file. (Hard link makes 2 files pointing to the same index in the file system (hard disk).)
  • shutdown -r 0 в†’ restart machine now. (power off is -P )

  • useradd userName в†’ create a new user account. (On Debian based Linuxes, there’s higher-level “adduser” written in perl.)
  • passwd userName в†’ change password for user.
  • id userName в†’ show the id number of a user, and all groups he belongs to.
  • cat /ect/passwd в†’ list all users
  • getent group в†’ list all groups. See getent –help

  • date в†’ show current date and time
  • date –rfc-3339=seconds в†’ show time stamp in this format: “yyyy-mm-dd hh:mm:ss-07:00” the last are time offset to UTC.
  • w в†’ show who is logged in.
  • who -a в†’ list all users that have logged in recently.
  • uptime в†’ show how long the system’s been running.
  • wc в†’ count the number of chars, words, lines. useful with cat , grep
  • source fname в†’ execute a file fname . source fname is equivalent to . fname
  • bash в†’ start a new bash. Ctrl + d to exit when done.
  • echo $PATH в†’ View value of a environment variable PATH .
  • env в†’ show all environment variables
  • alias str =” cmd “; в†’ make str as shortcut for cmd . For example, alias l=”ls -al –color”

Linux: Basic Shell Commands This is a list of most frequently used linux commands. These are essential commands. Most of them are used everyday by every linux user. The code here are based

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Why does my Hypnos Zero keep flashing white? The Hypnos Zero flashes white 10 times when the battery is depleted. Charge the battery fully before next use.

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