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A common verb usage is the phrase "You can't grep dead trees"—meaning one can more easily search through digital media, using tools such as grep, than one could with a hard copy (i.e. one made from "dead trees", which in this context is a dysphemism for paper). [29]
He later added this capability to the Unix editor ed, which eventually led to the popular search tool grep's use of regular expressions ("grep" is a word derived from the command for regular expression searching in the ed editor: g/re/p meaning "Global search for Regular Expression and Print matching lines"). [15]
While most Perl one-liners are imperative, Perl's support for anonymous functions, closures, map, filter (grep) and fold (List::Util::reduce) allows the creation of 'functional' one-liners. This one-liner creates a function that can be used to return a list of primes up to the value of the first parameter:
grep – a Unix command line utility; The name comes from a command in the Unix text editor ed that takes the form g/re/p meaning search globally for a regular expression and print lines where instances are found. [30] "Grep" like "Google" is often used as a verb, meaning "to search".
FINDSTR flags strings [drive:][path]filename[...] Arguments: flags This can be any combination of flags described below. strings Text to be searched for. [drive:][path]filename Specifies a file or files to search. Flags: /B Matches pattern if at the beginning of a line. /E Matches pattern if at the end of a line. /L Uses search strings literally.
List of Unix commands; List of DOS commands; Filter (higher-order function) find (Windows), a DOS and Windows command that is very different from Unix find; forfiles, a Windows command that finds files by attribute, similar to Unix find; grep, a Unix command that finds text matching a pattern, similar to Windows find
grep includes only lines that contain at least one lowercase alphabetical character (removing any blank lines). sort sorts the list of 'words' into alphabetical order, and the -u switch removes duplicates.
xargs is also a good companion for commands that output long lists of files such as find, locate and grep, but only if one uses -0 (or equivalently --null), since xargs without -0 deals badly with file names containing ', " and space.