o file) produces unpredictable results and is discouraged. Running grep on a non-text file (for example, an. when using the c shell interactively, you must enter a backslash before terminating a line in a multiline pattern. in some cases, such as in multiline pattern lists and subexpressions, quoting is essential. You are strongly encouraged to single quote patterns to protect them from unwanted shell substitutions. In the output of the grep command, a matched line is preceded with the name of the file in which it was found if you specify more than one file (except when the -h flag is specified). see discussion of regular expressions, below. with the -f flag, the pattern is considered a fixed string. with the -e flag, the pattern is treated as an extended regular expression ( ere). x displays a line only if the pattern matches the entire line.īy default, the grep command treats a pattern as a basic regular expression ( bre). a word is any string of alphanumeric characters (letters, numerals, and underscores) delimited by nonalphanumeric characters (punctuation or white space) or by the beginning or end of the line). w matches only if the expression is found as a separate word in the text. useful for filtering unwanted lines out of a file. v displays all lines except those that match the specified pattern. other error messages are still displayed. s suppresses error messages arising from non-existent or unreadable files. q suppresses all output except error messages. the default paragraph separator is a blank line.

lines containing the paragraph separators are used only as separators they are never included in the output. paragraphs are delimited by paragraph separators, paragraph_ separator, which are patterns in the same form as the search pattern. n precedes each line with its relative line number in the file.ĭisplays the entire paragraph containing matched lines. grep returns (standard input) (or the local equivalent) in place of a filename if -l is specified with standard input. each filename is listed only once filenames are separated by newline characters. l lists only the name of each file containing matched lines. i ignores the case of letters pattern matching that is, uppercase and lowercase in the input are considered to be identical. h suppresses reporting of filenames when multiple files are processed. Specifies a file that contains patterns to match, one per line. the -e flag is useful for specifying a pattern that begins with a - (dash). if more than one pattern is specified in pattern_ list, they must be separated by newline characters (carriage returns). Used to specify one or more patterns to match. c displays only a count of matching lines. use this flag to help find disk block numbers by context. b precedes each line by the block number on which it was found. f treats patterns as fixed strings and is equivalent to the obsolescent fgrep command. e treats patterns as extended regular expressions and is equivalent to the obsolescent egrep command. for example, if you specify -n and -l, the output includes filenames only (as specified by -l) and thus does not include line numbers (as specified by -n). The grep command searches the specified files (standard input by default) for lines containing characters that match the specified patterns, and then writes matching lines to standard output.Īlthough most flags can be combined, some combinations result in one flag overriding another. The commands grep -e and grep -f are equivalent to the obsolescent commands egrep and fgrep, respectively. REPLACEMENT supports $1, $# notations for captured groups in PATTERN.Name grep, egrep, fgrep - searches a file for patterns.PATTERN and REPLACEMENT should be skipped when -stdin is specified. PATTERN is either Regex (default) or Peg if -peg is specified.Positional arguments, from left to right: To list file names: nimgrep -filenames.

To replace: nimgrep PATTERN -replace REPLACEMENT (FILE/DIRECTORY)*/.

InstallationĬompile nimgrep with the command: nim c -d:release tools/nimgrep.nimĪnd copy the executable somewhere in your $PATH. Apart from that it is a generic text manipulation tool. Nimgrep has particularly good support for Nim's eccentric style insensitivity (see option -y below). User confirmation for every single replace operation can be requested. It can search for regex or peg patterns and can search whole directories at once. Nimgrep is a command line tool for search and replace tasks.

Grep manual