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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 (-)
  • 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
  • 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:
  • 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: 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 is the difference between `grep`, `egrep`, and `fgrep`?
    From "man grep": three variant programs egrep, fgrep and rgrep are available egrep is the same as grep -E fgrep is the same as grep -F rgrep is the same as grep -r Direct invocation as either egrep or fgrep is deprecated, but is provided to allow historical applications that rely on them to run unmodified
  • What is the use of -q parameter in grep command? [closed]
    What is the use of -q parameter in grep command? [closed] Ask Question Asked 3 years, 6 months ago Modified 3 years, 6 months ago
  • grep -P no longer works. How can I rewrite my searches?
    brew install grep Then it's available as ggrep (GNU grep) it doesn't replaces the system grep (you need to put the installed grep before the system one on the PATH) The version installed by brew includes the -P option, so you don't need to change your scripts





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