Linux Command (A-Z)
Linux is one of the most popular operating systems being widely used in modern IT industry. It is a free & open source software program available under the GNU General Public License. The most used & favorite distributions of LINUX are : CentOS, Ubuntu, Fedora & Debian. Red-Hat is also a Linux distro but available now on a license purchase.
List of A-Z Linux Commands :
| Command | Description |
| alias | Create an alias |
| apropos | Search manual for keyword |
| at | Schedule a job to run in the future. |
| awk | Find and Replace text within file(s) |
| break | Exit from a loop |
| builtin | Run a shell builtin |
| bunzip2 | Decompress file from bzip2 format |
| bzip2 | Compress file to bzip2 format |
| cal | Display a calendar |
| case | Conditionally perform a command |
| cat | Concatenate files to standard output |
| 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 |
| chvt | Change the virtual Terminal |
| 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 |
| compress | Compress file(s) to old Unix compress format |
| continue | Resume the next iteration of a loop |
| convmv | A perl script that converts filenames from one encoding to another |
| cp | Copy one or more files to another location |
| cron | Daemon to execute scheduled commands at predefined time |
| 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 |
| ed | A line-oriented text editor (edlin) |
| egrep | Search file(s) for lines that match an extended expression |
| eject | Eject CD-ROM |
| enable | Enable and disable builtin shell commands |
| env | Disp, set, or remove environment variables |
| 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 |
| factor | Print prime factors |
| 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 type of file |
| 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 | Disp, s memory usage |
| fsck | Filesystem consistency check and repair. |
| fstat | List open files |
| function | Define Function Macros |
| fuser | Identify process using file |
| 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 |
| gunzip | Decompress file(s) from GNU zip format |
| gzcat | Show contents of compressed file(s) |
| gzip | Compress file(s) to GNU zip format |
| 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 |
| iconv | Converts the encoding of characters from one code page encoding scheme to another. |
| id | Print user and group id’s |
| if | Conditionally perform a command |
| import | Capture an X server screen and save the image to file |
| info | Help info |
| 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 |
| 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) |
| ll | #ls -l List information about file(s) |
| lsof | List open files |
| m4 | Macro processor |
| makewhatis | Rebuild whatis database |
| man | Print manual pages |
| mkdir | Create new folder(s) |
| mkfifo | Make FIFOs (named pipes) |
| 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 |
| netconfig | Configure your network |
| nice | Set the priority of a command or job |
| nl | Number lines and write files |
| nohup | Run a command immune to hangup |
| od | View binary files |
| passwd | Modify a user password |
| paste | Merge lines of files |
| pathchk | Check file name portability |
| popd | Restore the previous value of the current directory |
| pr | Convert text 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 |
| pax | Archive file(s) |
| 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 (delete) files |
| rmdir | Remove folder(s) |
| rpm | RPM Package Manager (was RedHat Package Manager) |
| rsync | Remote file copy (Synchronize file trees) |
| screen | Terminal window manager |
| sdiff | Merge two files interactively |
| sed | Stream Editor |
| select | Accept keyboard input |
| seq | Print numeric sequences |
| set | Manipulate shell variables and functions |
| 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 |
| strings | print the strings of printable characters in (binary) files. |
| 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 |
| tac | Print files out in reverse line order |
| tail | Output the last part of files |
| tar | Tape ARchiver |
| tee | Redirect output to multiple files |
| test | Evaluate a conditional expression |
| time | Measure Program Resource Use |
| times | User and system times |
| timidity | Play midi files and set up software synth to play midi files with other commands. |
| 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 filesystem |
| unalias | Remove an alias |
| uname | Print system information |
| unexpand | Convert spaces to tabs |
| uniq | Uniquify files (remove all duplicate lines) |
| 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 into 7-bit ASCII characters |
| uudecode | Decode a file created by uuencode |
| v | Verbosely list directory contents (`ls -l -b’) |
| vdir | Verbosely list directory contents (`ls -l -b’) |
| watch | Execute/display a program periodically |
| whatis | List manual pages by name |
| wc | Print byte, word, and line counts of a file |
| 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’) |
| xargs | Execute utility, passing constructed argument list(s) |
| yes | Print a string until interrupted |
| zcat | Show contents of compressed file(s) |
| zip | Compress and archive file(s) to zip format |
| .period | Run commands from a file |
| ### | Comment / Remark |
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