An A-Z Index of the Linux BASH command line

alias    Create an alias apropos  Search Help manual pages (man -k) awk      Find and Replace text, database sort/validate/index

break    Exit from a loop builtin  Run a shell builtin bzip2    Compress or decompress named file(s)   cal      Display a calendar case     Conditionally perform a command

cat      Display the contents of a file cd       Change Directory cfdisk   Partition table manipulator for Linux

chgrp    Change group ownership

chmod    Change access permissions

chown    Change file owner and group chroot   Run a command with a different root directory

cksum    Print CRC checksum and byte counts clear    Clear terminal screen cmp      Compare two files comm     Compare two sorted files line by line command  Run a command - ignoring shell functions continue Resume the next iteration of a loop

cp       Copy one or more files to another location

cron     Daemon to execute scheduled commands crontab  Schedule a command to run at a later time

csplit   Split a file into context-determined pieces cut      Divide a file into several parts   date     Display or change the date & time dc       Desk Calculator dd       Data Dump - Convert and copy a file declare  Declare variables and give them attributes

df       Display free disk space

diff     Display the differences between two files

diff3    Show differences among three files

dir      Briefly list directory contents dircolors Colour setup for `ls'

dirname  Convert a full pathname to just a path dirs     Display list of remembered directories du       Estimate file space usage   echo     Display message on screen egrep    Search file(s) for lines that match an extended expression eject    Eject removable media enable   Enable and disable builtin shell commands env      Environment variables ethtool  Ethernet card settings eval     Evaluate several commands/arguments exec     Execute a command exit     Exit the shell expand   Convert tabs to spaces export   Set an environment variable expr     Evaluate expressions   false    Do nothing, unsuccessfully fdformat Low-level format a floppy disk fdisk    Partition table manipulator for Linux fgrep    Search file(s) for lines that match a fixed string file     Determine file type find     Search for files that meet a desired criteria fmt      Reformat paragraph text fold     Wrap text to fit a specified width. for      Expand words, and execute commands format   Format disks or tapes free     Display memory usage fsck     File system consistency check and repair ftp      File Transfer Protocol function Define Function Macros   gawk     Find and Replace text within file(s) getopts  Parse positional parameters grep     Search file(s) for lines that match a given pattern groups   Print group names a user is in gzip     Compress or decompress named file(s)   hash     Remember the full pathname of a name argument head     Output the first part of file(s)

history  Command History hostname Print or set system name   id       Print user and group id's if       Conditionally perform a command import   Capture an X server screen and save the image to file install  Copy files and set attributes   join     Join lines on a common field   kill     Stop a process from running   less     Display output one screen at a time let      Perform arithmetic on shell variables ln       Make links between files local    Create variables locate   Find files logname  Print current login name logout   Exit a login shell look     Display lines beginning with a given string lpc      Line printer control program lpr      Off line print lprint   Print a file lprintd  Abort a print job lprintq  List the print queue lprm     Remove jobs from the print queue ls       List information about file(s) lsof     List open files   make     Recompile a group of programs man      Help manual mkdir    Create new folder(s) mkfifo   Make FIFOs (named pipes) mkisofs  Create an hybrid ISO9660/JOLIET/HFS filesystem mknod    Make block or character special files more     Display output one screen at a time mount    Mount a file system mtools   Manipulate MS-DOS files mv       Move or rename files or directories   netstat  Networking information nice     Set the priority of a command or job nl       Number lines and write files nohup    Run a command immune to hangups   passwd   Modify a user password paste    Merge lines of files pathchk  Check file name portability ping     Test a network connection popd     Restore the previous value of the current directory pr       Prepare files for printing printcap Printer capability database printenv Print environment variables printf   Format and print data ps       Process status pushd    Save and then change the current directory pwd      Print Working Directory   quota    Display disk usage and limits quotacheck Scan a file system for disk usage quotactl Set disk quotas   ram      ram disk device rcp      Copy files between two machines. read     read a line from standard input readonly Mark variables/functions as readonly remsync  Synchronize remote files via email return   Exit a shell function rm       Remove files rmdir    Remove folder(s) rsync    Remote file copy (Synchronize file trees)   screen   Terminal window manager scp      Secure copy (remote file copy) sdiff    Merge two files interactively sed      Stream Editor select   Accept keyboard input seq      Print numeric sequences set      Manipulate shell variables and functions sftp     Secure File Transfer Program shift    Shift positional parameters shopt    Shell Options shutdown Shutdown or restart linux sleep    Delay for a specified time sort     Sort text files source   Run commands from a file `.' split    Split a file into fixed-size pieces ssh      Secure Shell client (remote login program) strace   Trace system calls and signals su       Substitute user identity sum      Print a checksum for a file symlink  Make a new name for a file sync     Synchronize data on disk with memory   tail     Output the last part of files tar      Tape ARchiver tee      Redirect output to multiple files test     Evaluate a conditional expression time     Measure Program running time times    User and system times touch    Change file timestamps top      List processes running on the system traceroute Trace Route to Host trap     Run a command when a signal is set(bourne) tr       Translate, squeeze, and/or delete characters true     Do nothing, successfully tsort    Topological sort tty      Print filename of terminal on stdin type     Describe a command   ulimit   Limit user resources umask    Users file creation mask umount   Unmount a device unalias  Remove an alias uname    Print system information unexpand Convert spaces to tabs uniq     Uniquify files units    Convert units from one scale to another unset    Remove variable or function names unshar   Unpack shell archive scripts until    Execute commands (until error) useradd  Create new user account usermod  Modify user account users    List users currently logged in uuencode Encode a binary file 

uudecode Decode a file created by uuencode   v        Verbosely list directory contents (`ls -l -b') vdir     Verbosely list directory contents (`ls -l -b') vi       Text Editor   watch    Execute/display a program periodically wc       Print byte, word, and line counts whereis  Report all known instances of a command     which    Locate a program file in the user's path.  while    Execute commands who      Print all usernames currently logged in whoami   Print the current user id and name (`id -un') Wget     Retrieve web pages or files via HTTP, HTTPS or FTP   xargs    Execute utility, passing constructed argument list(s) yes      Print a string until interrupted   .period  Run commands from a file ###      Comment / Remark