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tail has two special command line option -f and -F (follow) that allows a file to be monitored. Instead of just displaying the last few lines and exiting, tail displays the lines and then monitors the file. As new lines are added to the file by another process, tail updates the display. This is particularly useful for monitoring log files.
4 Line feed is used for "end of line" in text files on Unix / Linux systems. 5 Carriage Return (accompanied by line feed) is used as "end of line" character by Windows, DOS, and most minicomputers other than Unix- / Linux-based systems 6 Control-O has been the "discard output" key. Output is not sent to the terminal, but discarded, until ...
The concept of a one-liner program has been known since the 1960s [1] with the release of the APL programming language. With its terse syntax and powerful mathematical operators, APL allowed useful programs to be represented in a few symbols. In the 1970s, one-liners became associated with the rise of the home computer and BASIC.
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.
On many Unix systems and early dial-up bulletin board systems the only common standard for box-drawing characters was the VT100 alternate character set (see also: DEC Special Graphics). The escape sequence Esc ( 0 switched the codes for lower-case ASCII letters to draw this set, and the sequence Esc ( B switched back:
PWB UNIX tail: Text processing Mandatory 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
Using -0 for xargs deals with the problem, but many Unix utilities cannot use NUL as separator (e.g. head, tail, ls, echo, sed, tar-v, wc, which). But often people forget this and assume xargs is also line-oriented, which is not the case (per default xargs separates on newlines and blanks within lines, substrings with blanks must be single- or ...
Yacc (Yet Another Compiler-Compiler) is a computer program for the Unix operating system developed by Stephen C. Johnson.It is a lookahead left-to-right rightmost derivation (LALR) parser generator, generating a LALR parser (the part of a compiler that tries to make syntactic sense of the source code) based on a formal grammar, written in a notation similar to Backus–Naur form (BNF). [1]