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grep    
n. 文本查找工具

文本查找工具

A {Unix} command for
searching files for lines matching a given {regular
expression} (RE). Named after the {qed}/{ed} editor
subcommand "g/re/p", where re stands for a regular expression,
to Globally search for the Regular Expression and Print the
lines containing matches to it. There are two other variants,
fgrep which searches only for fixed strings and {egrep} which
accepts extended REs but is usually the fastest of the three.

Used by extension to mean "to look for something by pattern".
When browsing through a large set of files, one may speak of
"grepping around". "Grep the bulletin board for the system
backup schedule, would you?" See also {vgrep}.

[{Jargon File}]

Global Regular Expression Print (Unix)


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英文字典中文字典相关资料:


  • linux - What is the point of grep -q - Stack Overflow
    Moreover, this is a lot faster than a regular grep invocation, since it can exit immediately when the first match is found, rather than needing to unconditionally read (and write) to the end of file
  • What is the difference between grep -e and grep -E option?
    grep -e PATTERN unless, as stated in an earlier Answer and in the man pages, there are multiple search patterns, or to protect a pattern beginning with a hyphen (-)
  • regex - Using the star sign in grep - Stack Overflow
    grep * means "0 or more", and grep is greedy by default Note that in grep basic regular expressions the metacharacters ?, + , { , | , ( , and ) lose their special meaning
  • grep -rnw: search for a string in all files - Stack Overflow
    grep -rnw ' path to somewhere ' -e "pattern" However lately I encountered a problem, shown in the following picture: Looks like this command only recognizes strings that stand out as a word or something How should I modify the command to improve my search result?
  • UNIX grep command (grep -v grep) - Stack Overflow
    11 grep when used with ps -ef also outputs the grep used for filtering the output of ps -ef grep -v grep means that do not include the grep used for filtering in the command output You can also avoid grep in the results by using a regex pattern For example, in the following example you won't need a grep -v grep to avoid grep in the output:
  • How to run grep with multiple AND patterns? - Unix Linux Stack Exchange
    I would like to get the multi pattern match with implicit AND between patterns, i e equivalent to running several greps in a sequence: grep pattern1 | grep pattern2 | So how to convert it to
  • How to make multi-line regexp work in grep? - Stack Overflow
    However when I try to use it with grep, it does not work I tried with -e, -P and -E The errors I get: invalid option -- ' ' or no match at all Any online regexp verification tool will tell you what a regexp does in that tool, that doesn't mean it'll do the same in any Unix command line tool, especially the mandatory POSIX awk, sed, and grep
  • Whats the difference between grep -r and -R - Stack Overflow
    In the man page: -r Read all files under each directory, recursively, following symbolic links only if they are on the command line what exactly does "being on the command line" means? T
  • Grep: how to add an OR condition? - Unix Linux Stack Exchange
    How can I introduce a conditional OR into grep? Something like, grepping a file's type for (JPEG OR JPG), and then sending only those files into the photos folder For example I know how to sen
  • What expressions would match the pattern (^[0-9]. . [a-zA-Z ]+$) in grep . . .
    Let's break it down First of all, note that this RegExp uses the "Extended regular expression" syntax (ERE) - the + is a metacharacter that doesn't work in the "Basic regular expression" syntax that grep uses by default (meaning it would match itself and require a literal + at that position), so if you want to use that RegEx with grep, you will need to pass the -E option The ^ is an anchor





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