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Useless use of cat (UUOC) is common Unix jargon for command line constructs that only provide a function of convenience to the user. [12] In computing, the word "abuse", [ 13 ] in the second sense of the definition, is used to disparage the excessive or unnecessary use of a language construct; thus, abuse of cat is sometimes called "cat abuse".
Cut out selected fields of each line of a file System III cxref: C programming Optional (XSI) Generate a C-language program cross-reference table System V date: Misc Mandatory Display the date and time Version 1 AT&T UNIX dd: Filesystem Mandatory Convert and copy a file Version 5 AT&T UNIX delta: SCCS Optional (XSI) Make a delta (change) to an ...
This displays the first 5 lines of all files starting with foo: head -n 5 foo* Most versions [citation needed] allow omitting n and instead directly specifying the number: -5. GNU head allows negative arguments for the -n option, meaning to print all but the last - argument value counted - lines of each input file.-c bytes --bytes = bytes
getopt — Parse command line options and parameters. grep — Show lines matching regular expressions. groups — Print the groups a user is in. gunzip — Decompress gz files. halt — Restart, halt or powerdown the system. head — Copy first lines from files to stdout. help — Show usage information for toybox commands. hexedit ...
For example, if a script is named with the path path/to/script, and it starts with the line #!/bin/sh, then the program loader is instructed to run the program /bin/sh, passing path/to/script as the first argument. The shebang line is usually ignored by the interpreter, because the "#" character is a comment marker in many scripting languages ...
Ubuntu is a Debian-based Linux distribution for personal computers, tablets and smartphones, where the Ubuntu Touch edition is used; and also runs network servers, usually with the Ubuntu Server edition, either on physical or virtual servers (such as on mainframes) or with containers, that is with enterprise-class features.
Karelia — ASP Linux 10; Karmic Koala — GNU\Linux Ubuntu 9.10; Katana — Sega Dreamcast; Katmai — Intel Pentium 3 250 nm processor; Kauai — KU440EX; Kauai — Sun KJava VM; Kelowna — XMetaL Author 4.0 Service Pack 1; Ketchup — UHU Linux 1.2-beta2; Keystone — HP-9000 rp7410; Khepri — IBM two-way processors; Kitkat — Android 4.4 ...
Command-line completion allows the user to type the first few characters of a command, program, or filename, and press a completion key (normally Tab ↹) to fill in the rest of the item. The user then presses Return or ↵ Enter to run the command or open the file.