- Using grep examples manual#
- Using grep examples windows#
Lrwxrwxrwx 1 root root 10 rc0.d -> rc.d/rc0.d The following example matches all lines that contain a number in the range 1 to 6, followed by any single character, followed by a “d”. Search for a pattern containing a range of characters The following example matches all lines in the ps -ef output that end in bash: ~]$ ps -ef | grep "sh$" Search for a pattern at the end of a line The following example matches all lines in the ps -ef output that start with the string ptr: ~]$ ps -ef | grep "^ptr" Search for a pattern at the beginning of a line exit-with-session /etc/X11/xinit/Xclients" The following example matches all lines in the ps -ef output that have sh anywhere in them: ~]$ ps -ef | grep "sh" The back slash \ is an escape character.
The asterisk * matches zero or more occurrences of the previous character. The dollar sign $ at the end of a string matches the empty string at the end of a line. The caret ^ at the start of a string matches and the empty string at the beginning of the line. list of characters enclosed by matches any single character in that list (if first character is the caret ^ then it matches any character not in the list). Here is a brief description of these special characters The basic characters supported by grep are: Grep supports basic regular expression characters and the other two support some of the more more advanced regular expression characters. Linux and UNIX systems offer three variants of the grep command: The grep command is perfect in these situations and we explore some of it’s capabilities here. Using grep examples manual#
Unix grep(1) manual page at will be many occasions when you are trying locate a specific set of lines in a file, such as a log file, or perhaps you are trying filter the results that have come back from a Linux or Unix command to just the ones relevant to your specific needs.GNU grep user's manual as one page at gnu.org.
Using grep examples windows#
Release announcements of GNU grep are at a savannah group.Ī changelog of GNU grep is available from .Ī version of GNU grep for MS Windows is available from GnuWin32 project, as well as from Cygwin. Old versions of GNU grep can be obtained from GNU ftp server. Versions An example of GNU Grep in operation.
Not really a grep example but a Perl oneliner that you can use if Perl is available and grep is not. perl -ne "print if /\x22hello\x22/" file.txt. Regular expression features available in grep include *. Grep covers POSIX basic regular expressions (see also Regular Expressions/Posix Basic Regular Expressions). Grep uses a particular version of regular expressions different from sed and Perl. Unix grep(1) manual page at, DESCRIPTION section. 2.1 Command-line Options at grep manual, gnu.org. -regexp=pattern, in addition to -e pattern. -o: Output the matched parts of a matching line.Ĭommand-line options aka switches of GNU grep, beyond the bare-bones grep:. -s: Suppress error messages about nonexistent or unreadable files. -h: Output matching lines without preceding them by file names. -b: A historical curiosity: precede each matching line with a block number. -n: Precede each matching line with a line number. -c: Output count of matching lines only. * which can stand for anything in a file's name and \(txt\|jpg\) which yields either txt or jpg as file endings.Ĭommand-line options aka switches of grep:
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