linux
Command |
Description |
| adduser | Add a new user |
| arch | Print machine architecture |
| awk | Find and Replace text within file(s) |
| bc | An arbitrary precision calculator language |
| cal | Display a calendar |
| cat | Concatenate files and print on the standard output |
| chdir | Change working directory |
| chgrp | Change the group ownership of files |
| chkconfig | Tool for maintaining the /etc/rc[0-6].d directory hierarchy |
| chmod | Change the access permissions of files and directories |
| chown | Change the user and group ownership of files |
| chroot | Change 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 |
| 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 |
| 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 |
| 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 |
| env | Display, set, or remove environment variables |
| expand | Convert tabs to spaces |
| 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 |
| find | Search for files that meet a desired criteria |
| fmt | Reformat paragraph text |
| fold | Wrap text to fit a specified width |
| format | Format disks or tapes |
| free | Display memory usage |
| fsck | Filesystem consistency check and repair |
| gawk | Find and Replace text within file(s) |
| 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) |
| head | Output the first part of file(s) |
| hostname | Print or set system name |
| id | Print user and group id’s |
| 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 |
| ln | Make links between files |
| locate | Find files |
| logname | Print current login name |
| lpc | Line printer control program |
| lpr | Off line print |
| lprm | Remove jobs from the print queue |
| ls | List information about file(s) |
| man | Help manual |
| 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 |
| mv | Move or rename files or directories |
| 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 |
| pr | Convert text files for printing |
| printcap | Printer capability database |
| printenv | Print environment variables |
| printf | Format and print data |
| ps | Process status |
| 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 |
| rm | Remove files |
| rmdir | Remove folder(s) |
| rpm | Remote 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 |
| shutdown | Shutdown or restart linux |
| sleep | Delay for a specified time |
| sort | Sort text files |
| split | Split a file into fixed-size pieces |
| 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 | Concatenate and write files in reverse |
| 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 |
| touch | Change file timestamps |
| top | List processes running on the system |
| traceroute | Trace Route to Host |
| tr | Translate, squeeze, and/or delete characters |
| true | Do nothing, successfully |
| tsort | Topological sort |
| tty | Print filename of terminal on stdin |
| umount | Unmount a device |
| uname | Print system information |
| unexpand | Convert spaces to tabs |
| uniq | Uniquify files |
| units | Convert units from one scale to another |
| unshar | Unpack shell archive scripts |
| 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 |
| vdir | Verbosely list directory contents (`ls -l -b’) |
| 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 |
| 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 |