The name is an abbreviation of catenate, a variant form of concatenate [1][2] originally developed for unix, it is available on many operating systems and shells today In addition to combining files, cat is commonly used to copy files and in particular to copy a file to the terminal monitor Some shells implement the command as builtin and some provide it as a utility program [2] the command has similar syntax and semantics as the library function The command outputs text to standard output [3] as specified by a format string and a. It writes data from a buffer declared by the user to a given device, such as a file
This is the primary way to output data from a program by directly using a system call The destination is identified by a numeric code The data to be written, for instance a piece of text, is defined by a pointer and. [1] the various dialects of shell scripts are considered to be command languages Typical operations performed by shell scripts include file manipulation, program execution, and printing text A script which sets up the environment, runs.
