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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".
Copy the last part of a file PWB UNIX [citation needed] talk: Misc Optional (UP) Talk to another user 4.2BSD tee: Shell programming Mandatory Duplicate the standard output: Version 5 AT&T UNIX test: Shell programming Mandatory Evaluate expression: Version 7 AT&T UNIX time: Process management Mandatory Retrieve and format time and date Version 3 ...
The shebang line is usually ignored by the interpreter, because the "#" character is a comment marker in many scripting languages; some language interpreters that do not use the hash mark to begin comments still may ignore the shebang line in recognition of its purpose. [9]
Ask Ubuntu is a community-driven question and answer website for the Ubuntu operating system. It is part of the Stack Exchange Network, running the same software as Stack Overflow. [1] Members gain reputation based on the community's response (through voting) to their questions and answers. Reputation signifies trust for users in the answers ...
Ubuntu (/ ʊ ˈ b ʊ n t uː / ⓘ uu-BUUN-too) [9] is a Linux distribution derived from Debian and composed mostly of free and open-source software. [10] [11] [12] Ubuntu is officially released in multiple editions: Desktop, [13] Server, [14] and Core [15] for Internet of things devices [16] and robots.
Range Purpose x0x: Syntax These replies refer to syntax errors, syntactically correct commands that don't fit any functional category, unimplemented or superfluous commands.
Next Line k: Previous Line Home: Top of file End: End of file F: Follow Mode (for expanding logs or pipes). Interrupt (or from v581 Ctrl+X [6]) to abort. g or < First Line G or > Last Line n G: Line n / text Forward Search for text . Text is interpreted as a regex. ? text Backward Search like / & text grep like filter n: Next Search Match N
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.