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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'm clear on the command I want to use and how to grep out string(s) as needed.
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.
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Recursive Search To recursively search for a pattern, invoke grep with the -r option (or --recursive ). When this option is used grep will search through all files in the specified directory, skipping the symlinks that are encountered recursively.
Grep is a powerful utility available by default on UNIX-based systems. The name stands for Global Regular Expression Print. By using the grep command, you can customize how the tool searches for a pattern or multiple patterns in this case. You can grep multiple strings in different files and directories.
You can make grep search in all the files and all the subdirectories of the current directory using the -r recursive search option: grep -r search_term . You may also specify the directory path if you are not in the directory where you want to perform the search: That was a quick recap.
Grep provides a -r option for the recursive search. With this option, grep will look into all the files in the current (or specified) directory and it will also look into all the files of all the subdirectories. Here's the recursive search I performed in the previous example to do a grep search in the current folder: grep -r simple .
The -R is dereferenced search which means it will follow the symbolic links to go to the original file (which may be located in some other part of the system). Did you notice that it gives an additional search result with the linked.txt which is basically a symbolic link and was omitted from the grep search with -r option?
You need the -d skip option added on. Grep is searching inside of files. By default, grep will read all files, and it detects the directories. Searching just within the parent directory would be `grep -d skip "string" ./*
grep $PATTERN * would be sufficient. By default, grep would skip all subdirectories. However, if you want to grep through them, grep -r $PATTERN * is the case.
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In Linux, I normally use this command to recursively grep for a particular text within a directory:
grep -rni "string" *
where
r = recursive i.e, search subdirectories within the current directoryn = to print the line numbers to stdout
i = case insensitive search
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