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The command has a number of switches: a - number all lines; t - number lines with printable text only; n - no line numbering; string - number only those lines containing the regular expression defined in the string supplied.
For example: NL is part of EBCDIC, which uses code 0x15; it is normally mapped to Unicode NEL, 0x85, which is a control character in the C1 control set. [10] As such, it is defined by ECMA 48, [11] and recognized by encodings compliant with ISO/IEC 2022 (which is equivalent to ECMA 35). [12] C1 control set is also compatible with ISO-8859-1.
nl is a file format for presenting and archiving mathematical programming problems. [1] Initially, this format has been invented for connecting solvers to AMPL. [2] It has also been adopted by other systems such as COIN-OR (as one of the input formats), FortSP (for interacting with external solvers), and Coopr (as one of its output formats).
PCMCIA—Personal Computer Memory Card International Association; PCM—Pulse-Code Modulation; PCRE—Perl Compatible Regular Expressions; PD—Public Domain; PDA—Personal Digital Assistant; PDF—Portable Document Format; PDH—Plesiochronous Digital Hierarchy; PDP—Programmed Data Processor; PE—Physical Extents; PE—Portable Executable
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.
zip – a file format, also used as a verb to mean compress. The file format was created by Phil Katz, and given the name by his friend Robert Mahoney. The compression tool Phil Katz created was named PKZIP. Zip means "speed", and they wanted to imply their product would be faster than ARC and other compression formats of the time.
Take for example one line in the ls -l output: drwxr-xr-x 2 root root 0 Jan 1 1970 home POSIX specifies [5] the format of the output for the long format (-l option). In particular, the first field (before the first space) is dubbed the "file mode string", here drwxr-xr-x. Its first character describes the file type, here d (directory).