How to grep recursively but only in files with certain extensions

Question

I m working on a script to grep certain directories    grep -r -i CP Image   path1   grep -r -i CP Image   path2   grep -r -i CP Image   path3   grep -r -i CP Image   path4   grep -r -i CP Image   path5        mailx -s GREP email domain com  How can I limit results only to extensions  h and  cpp

User · Answer

There is no -r option on HP and Sun servers  this way worked for me on my HP server  find   -name    c    xargs grep -i  my great text    -i is for case insensitive search of string

User · Answer

ag  the silver searcher  has pretty simple syntax for this         -G --file-search-regex PATTERN           Only search files whose names match PATTERN    so  ag -G   h -G   cpp CP Image  lt path gt

User · Answer

If you want to filter out extensions from the output of another command e g   quot git quot   files   git diff --name-only --diff-filter d origin master      grep -E    cpp    h     for file in  files  do     echo  quot  file quot  done

User · Answer

How about   find   -name    h  -o -name    cpp  -exec grep  CP Image        -print

User · Answer

Since this is a matter of finding files  let s use find   Using GNU find you can use the -regex option to find those files in the tree of directories whose extension is either  h or  cpp   find -type f -regex        h  cpp                                           Then  it is just a matter of executing grep on each of its results   find -type f -regex        h  cpp    -exec grep  your pattern         If you don t have this distribution of find you have to use an approach like Amir Afghani s  using -o to concatenate options  the name is either ending with  h or with  cpp    find -type f    -name    h  -o -name    cpp     -exec grep  your pattern                                                           And if you really want to use grep  follow the syntax indicated to --include   grep  your pattern  -r --include    cpp h

User · Answer

The easiest way is find   -type  f -name    extension  2 gt  dev null   xargs grep -i string   Edit  add 2 gt  dev null to kill the error output To include more file extensions and grep for password throughout the system  find   -type  f    -name    conf  -o -name  quot   log quot  -o -name  quot   bak quot     2 gt  dev null   xargs grep -i password

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I am aware this question is a bit dated  but I would like to share the method I normally use to find  c and  h files   tree -if   grep     ch   b   xargs -n 1 grep -H   include    or if you need the line number as well   tree -if   grep     ch   b   xargs -n 1 grep -nH   include

User · Answer

Just use the --include parameter  like this  grep -inr --include    h --include    cpp CP Image   path 12345    mailx -s GREP email domain com  that should do what you want  To take the explanation from HoldOffHunger s answer below   grep  command  -r  recursively  -i  ignore-case  -n  each output line is preceded by its relative line number in the file  --include    cpp  all   cpp  C   files  escape with   just in case you have a directory with asterisks in the filenames       Start at current directory

User · Answer

grep -rnw  some thing to grep  --include    module inc php js css html htm

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Some of these answers seemed too syntax-heavy  or they produced issues on my Debian Server   This worked perfectly for me   grep -r --include    txt  searchterm          or case-insensitive version     grep -r -i --include    txt  searchterm        grep  command -r  recursively -i  ignore-case --include  all   txt  text files  escape with   just in case you have a directory with asterisks in the filenames   searchterm   What to search     Start at current directory    Source  PHP Revolution  How to Grep files in Linux  but only certain file extensions

User · Answer

Should write  -exec grep   for each  -o -name    find   -name    h  -exec grep -Hn  CP Image        -o -name    cpp  -exec grep -Hn  CP Image          Or group them by      find      -name    h  -o -name    cpp     -exec grep -Hn  CP Image          option  -Hn  show the file name and line

User · Answer

The below answer is good   grep -r -i --include    h --include    cpp CP Image   path 12345    mailx -s GREP email domain com   But can be updated to   grep -r -i --include     h cpp  CP Image   path 12345    mailx -s GREP email domain com   Which can be more simple

[grep] How to grep recursively, but only in files with certain extensions?

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