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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".
This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
This is a list of commands from the GNU Core Utilities for Unix environments. These commands can be found on Unix operating systems and most Unix-like operating systems. GNU Core Utilities include basic file, shell and text manipulation utilities. Coreutils includes all of the basic command-line tools that are expected in a POSIX system.
TRSDOS commands and counterparts in other operating systems Command DOS, OS/2, Windows Unix, Unix-like Description APPEND type file1 >> file2: cat file >> file2: Under TRSDOS 6.x, the source of the appended data may be a system input device such as *KI. Thus whatever is typed at the keyboard will be appended to the target file.
The man page for the sed utility, as seen in various Linux distributions. A man page (short for manual page) is a form of software documentation found on Unix and Unix-like operating systems. Topics covered include programs, system libraries, system calls, and sometimes local system details. The local host administrators can create and install ...
The two programs performing the commands may run in parallel with the only storage space being working buffers (Linux allows up to 64K for each buffer) plus whatever work space each command's processing requires. For example, a "sort" command is unable to produce any output until all input records have been read, as the very last record ...
For example, to list files in the current directory , retain only the lines of ls output containing the string "key" , and view the result in a scrolling page , a user types the following into the command line of a terminal:
First is cat, the simplest of all the printing programs. cat simply prints on the terminal the contents of all the files named in a list. Thus cat junk prints one file, and cat junk temp prints two. The files are simply concatenated (hence the name ‘‘cat’’) onto the terminal.