How to find all files containing specific text (which includes a backslash)?

Question

I thought I found the perfect answer with How do I find all files containing specific text on Linux? , so I tried it:

[Michael@devserver ~]$ grep -rnw '/var/www/concrete5.7.5.9/' -e "Concrete\Core\Block\BlockController"
[Michael@devserver ~]$

None show, but I know there should have been a match.

[Michael@devserver ~]$ grep -rnw '/var/www/concrete5.7.5.9/concrete/blocks/html' -e "BlockController"
/var/www/concrete5.7.5.9/concrete/blocks/html/controller.php:5:use \Concrete\Core\Block\BlockController;
/var/www/concrete5.7.5.9/concrete/blocks/html/controller.php:7:class Controller extends BlockController
[Michael@devserver ~]$

I also tried escaping the backslash to no avail.

[Michael@devserver ~]$ grep -rnw '/var/www/concrete5.7.5.9/' -e "Concrete\\Core\\Block\\BlockController"
[Michael@devserver ~]$

Also tried single quotes to no avail.

[Michael@devserver ~]$ grep -rnw '/var/www/concrete5.7.5.9/' -e 'Concrete\Core\Block\BlockController'
[Michael@devserver ~]$

How to find all files containing specific text which includes a backslash on Linux?

Answer 1

使用单引号和转义反斜杠。

grep -rnw '/var/www/concrete5.7.5.9/' -e'Concrete\\Core\\Block\\BlockController'

Answer 2

使用单引号。

grep -rnw '/var/www/concrete5.7.5.9/' -e 'Concrete\Core\Block\BlockController'

Answer 3

Grep has an option -F to interpret the pattern literally and not as a regular expression. For example:

$ cat infile
use \Concrete\Core\Block\BlockController;
class Controller extends BlockController
$ grep 'Concrete\Core\Block\BlockController' infile     # No match!
$ grep -F 'Concrete\Core\Block\BlockController' infile  # Matches!
use \Concrete\Core\Block\BlockController;