14

I am using gedit text editor with embedded terminal in ubuntu 12.04. I'm trying to search for some text using grep. I want to search for this line of code

'type' => 'select'

I tried:

grep -r '\'type\' => \'select\''

But grep didn't return any results.

So can someone kindly tell me how to search for the code above?

17

Surround your search string with double quotes:

grep "'type' => 'select'"
| improve this answer | |
8

You cannot escape single quotes that appear within single quotes. As explained in the [bash manual]:(http://www.gnu.org/software/bash/manual/bashref.html#Single-Quotes):

Enclosing characters in single quotes (‘'’) preserves the literal value of each character within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash.

So, you have to use different approaches:

  1. Use double quotes:

    grep  "'type' => 'select'" file 
    
  2. If you prefer needlessly complex solutions:

    grep  "'"type"'"\ =\>\ "'"select"'" file 
    
  3. You can always search for any single character instead of specifying the single quotes:

    grep  '.type. => .select.' file 
    

But just use ", it makes things much more straightforward.

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  • What if the string I'm searching for is in a php file and contains variables? I'm really struggling with this one. – Aubrey Robertson Aug 30 '16 at 23:29
  • @AubreyRobertson I'd need an example to answer properly. If you want to find something like the string $var, you could do grep '$var' file.php in single quotes. For more detail, please post a new question and leave me a comment here. I'd be happy to help. – terdon Aug 31 '16 at 0:05
  • I figured it out. It wasn't the dollar signs that were bungling my grep, it was the array references (square brackets) because grep uses those for regex. This is the line I was trying to grep: $output = $info['function']($variables); I just had to escape them properly with double backslash. This is my grep command after all said and done: targetstring="\$output = \$info\\['function'\\](\$variables);" targetlinenumber=`grep -n "$targetfile" -e "$targetstring" | cut -d :f 1` – Aubrey Robertson Aug 31 '16 at 14:52
1

cd to the directory that contains your .txt file

cd /path 

Then :

you can use grep "'type' => 'select'" name.txt

or :

`grep "'type' => 'select'" /path/file.txt

Output :

enter image description here

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  • 3
    The question only concerns the single quotes, not the directory structure or any of grep's other (slightly irrelevant) functionality. – Chris Mar 10 '14 at 6:09
  • @Chris, indeed, with the -r option (as OP writes), the file name is not necessary. – Brady Trainor Aug 2 '14 at 19:39

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