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The -f tells awk that the argument that follows is the file to read the AWK program from, which is the same flag that is used in sed. Since they are often used for one-liners, both these programs default to executing a program given as a command-line argument, rather than a separate file.
Create a tags file 3BSD cut: Text processing Mandatory Cut out selected fields of each line of a file System III cxref: C programming Optional (XSI) Generate a C-language program cross-reference table System V date: Misc Mandatory Display the date and time Version 1 AT&T UNIX dd: Filesystem Mandatory Convert and copy a file Version 5 AT&T UNIX ...
Concatenates and prints files on the standard output cksum: Checksums (IEEE Ethernet CRC-32) and count the bytes in a file. Supersedes other *sum utilities with -a option from version 9.0. comm: Compares two sorted files line by line csplit: Splits a file into sections determined by context lines cut: Removes sections from each line of files expand
sed is a line-oriented text processing utility: it reads text, line by line, from an input stream or file, into an internal buffer called the pattern space. Each line read starts a cycle . To the pattern space, sed applies one or more operations which have been specified via a sed script . sed implements a programming language with about 25 ...
Some magazines devoted regular columns solely to impressive short and one-line programs. [2] The word One-liner also has two references in the index of the book The AWK Programming Language (the book is often referred to by the abbreviation TAPL). It explains the programming language AWK, which is part of the Unix operating system.
uniq — Report or filter out repeated lines in a file. unix2dos — Convert newline format from unix "\n" to dos "\r\n". unlink — Delete one file. unshare — Create new container namespace for this process and its children, so some attribute is not shared with the parent process.
TEX provided standard line-based file editing commands: P: print current line; F: move forward through the current file line by line; B: move backward through the current file line by line; A: append after the current line; I: insert before the current line; R: replace the current with the expression provided; D: delete the current line
Typical streams include log files, delimiter-separated values, or email messages, notably for email filtering. For example, an AWK program may take as input a stream of log statements, and for example send all to the console, write ones starting with WARNING to a "WARNING" file, and send an email to a sysadmin in case any line starts with ...