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  2. grep - Wikipedia

    en.wikipedia.org/wiki/Grep

    The pcregrep command is an implementation of grep that uses Perl regular expression syntax. [17] Similar functionality can be invoked in the GNU version of grep with the -P flag. [18] Ports of grep (within Cygwin and GnuWin32, for example) also run under Microsoft Windows. Some versions of Windows feature the similar qgrep or findstr command. [19]

  3. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    For example, . is a very general pattern, [a-z] (match all lower case letters from 'a' to 'z') is less general and b is a precise pattern (matches just 'b'). The metacharacter syntax is designed specifically to represent prescribed targets in a concise and flexible way to direct the automation of text processing of a variety of input data, in a ...

  4. ngrep - Wikipedia

    en.wikipedia.org/wiki/Ngrep

    ngrep (network grep) is a network packet analyzer written by Jordan Ritter.It has a command-line interface, and relies upon the pcap library and the GNU regex library.. ngrep supports Berkeley Packet Filter logic to select network sources or destinations or protocols, and also allows matching patterns or regular expressions in the data payload of packets using GNU grep syntax, showing packet ...

  5. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    Version 1 AT&T UNIX dd: Filesystem Mandatory Convert and copy a file Version 5 AT&T UNIX delta: SCCS Optional (XSI) Make a delta (change) to an SCCS file PWB UNIX df: Filesystem Mandatory Report free disk space Version 1 AT&T UNIX diff: Text processing Mandatory Compare two files; see also cmp Version 5 AT&T UNIX dirname: Filesystem Mandatory

  6. Comparison of regular expression engines - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_regular...

    NOTE: An application using a library for regular expression support does not necessarily support the full set of features of the library, e.g., GNU grep uses PCRE, but supports no lookahead, though PCRE does.

  7. Filter (software) - Wikipedia

    en.wikipedia.org/wiki/Filter_(software)

    The classic filter in Unix is Ken Thompson's grep, which Doug McIlroy cites as what "ingrained the tools outlook irrevocably" in the operating system, with later tools imitating it. [1] grep at its simplest prints any lines containing a character string to its output. The following is an example:

  8. find (Windows) - Wikipedia

    en.wikipedia.org/wiki/Find_(Windows)

    Findstr, Windows and ReactOS command-line tool to search for patterns of text in files. find (Unix), a Unix command that finds files by attribute, very different from Windows find; grep, a Unix command that finds text matching a pattern, similar to Windows find; forfiles, a Windows command that finds files by attribute, similar to Unix find

  9. Pattern matching - Wikipedia

    en.wikipedia.org/wiki/Pattern_matching

    The patterns generally have the form of either sequences or tree structures. Uses of pattern matching include outputting the locations (if any) of a pattern within a token sequence, to output some component of the matched pattern, and to substitute the matching pattern with some other token sequence (i.e., search and replace).