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grep is a command-line utility for searching plaintext datasets for lines that match a regular expression. Its name comes from the ed command g/re/p (global regular expression search and print), which has the same effect.
results = grep { … } list results = grep expr, list results = map { … } list results = map expr, list. grep returns all elements of list for which the controlled block or expression evaluates to true. map evaluates the controlled block or expression for each element of list and returns a list of the resulting values
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]
List comprehension is a syntactic construct available in some programming languages for creating a list based on existing lists. It follows the form of the mathematical set-builder notation (set comprehension) as distinct from the use of map and filter functions.
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.
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
/F:file Reads file list from the specified file(/ stands for console). /C:string Uses specified string as a literal search string. /G:file Gets search strings from the specified file(/ stands for console). /D:dir Search a semicolon delimited list of directories; Note: Following command displays the detailed help about this command: FINDSTR /?
List of Unix commands; pidof — find the process ID of running programs; pkill — signal processes based on name and other attributes; ps — display the currently running processes; grep — search for lines of text that match one or many regular expressions