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How do I run grep on all the files in a directory?


Working with xenserver, and I want to perform a command on each file that is in a directory, grepping some stuff out of the output of the command and appending it in a file.

I understand the command I want to use and how to grep out the required string(s).

But what I’m not clear on is how do I have it perform this command on each file, going to the next, until no more files are found.

Asked by user2147075

Solution #1

It would suffice to use grep $PATTERN *. All subdirectories are skipped by default when using grep. grep -r $PATTERN * is the case if you want to grep through them.

Answered by umi

Solution #2

I usually use this command on Linux to recursively grep for a specific text within a directory:

grep -rni "string" *


Answered by Narain

Solution #3

Make use of the find function. Seriously, it’s the greatest method because you can see exactly which files it’s working on:

find . -name "*.sql" -exec grep -H "slow" {} \;

Note that the -H specifies a Mac and displays the filename in the results.

Answered by Rob

Solution #4

To search in all sub-directories, but only in specific file types, use grep with –include.

Searching recursively in the current directory for text in *.yml and *.yaml, for example:

grep "text to search" -r . --include=*.{yml,yaml}

Answered by Noam Manos

Solution #5

If you want to run a series of commands, type:

for I in `ls *.sql`
    grep "foo" $I >> foo.log
    grep "bar" $I >> bar.log

Answered by bryan

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