alias: allows launching of any command or combination of commands by using a preset character or series of characters. apropos: displays a list of all topics in the built-in user manual that are related to the subject of a query. bzip2: used for compressing and decompressing files. cat: (short for concatenate) has three related functions with regard to text files: displaying them, combining copies of them and creating new ones. cd: changes directories. clear: removes all previous commands and output from consoles and terminal windows. cp: copies files and directories. df: reports the amount of space used and available on currently mounted filesystems. dmesg: reads the kernel messages.
du: shows the sizes of directories and files. fdformat: performs low-level formatting of floppy disks. file: classifies filesystem objects. free: provides information about unused and used memory and swap space. grep: searches text. head: by default reads the first ten lines of text. hostname: shows or sets a computer's host name and domain name. kdesu: opens KDE su, the graphical front end for the su command. kill: terminates stalled processes without having to log out or reboot. killall: terminates all processes associated with programs whose names are provided to it as arguments. locate: finds files and directories. man: formats and displays the built-in manual pages. mkbootdisk: creates an emergency boot floppy. mkdir: creates new directories. mkfs: creates a filesystem on a disk or on a partition thereof. mv: renames and moves files and directories. ps: (short for process status) lists the currently running processes and their process identification numbers (PIDs). pstree: displays the processes on the system in the form of a tree diagram. pwd: (short for present working directory) displays the full path to the current directory. reboot: restarts a computer without having to turn the power off and back on. rm: deletes the specified files and directories. rmdir: deletes the specified empty directories. runlevel: reports the current and previous runlevels. shred: destroys files. spell: checks spelling. strings: returns each string of printable characters in files. su: (short for substitute user) changes a login session's owner without the owner having to first log out of that session. tail: by default reads the final ten lines of text. tar: converts a group of files into an archive. touch: the easiest way to create new, empty files. tr: translates or deletes characters. unalias: removes entries from the current user's list of aliases. uname: provides basic information about a system's software and hardware. uptime: shows the current time, how long the system has been running since it was booted up, how many user sessions are currently open and the load averages. w: shows who is logged into the system and what they are doing. wc: by default counts the number of lines, words and characters that are contained in text.
whatis: provides very brief descriptions of command line programs and other topics related to Unix-like operating systems. whereis: locates the binary, source code and man page for any specified program. whoami: returns the user name of the owner of the current login session.
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Created May 28, 2005. Last updated December 19, 2006. |