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I'm grepping a local svn directory. When I run grep -r "pattern" . I get some errors such as
grep: ./Data/test: No such file or directory
Who asked grep to look for non-existent files?
>grep --version grep (GNU grep) 2.10 >lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS 
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Grep command is used to search text from files. It is a versatile pattern that invokes grep with –r. –R option search files recursively from subdirectories, starting from the current directory.
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.
By default, grep will search all files in a given folder and its subfolders if you invoke it with the recursive -r flag.
Due to the -v flag, these lines will be removed from the output. In this context, the grep command will filter the output of git branch --merged . The latter outputs a list of branches, out of which the current branch is marked with an asterisk. grep -v "\*" simply removes the current branch from the output.
By default, grep would not ignore non-existent or unreadable files. You need to supply the -s or --no-messages option in order to do so. Quoting from man grep:
-s, --no-messages Suppress error messages about nonexistent or unreadable files. Portability note: unlike GNU grep, 7th Edition Unix grep did not conform to POSIX, because it lacked -q and its -s option behaved like GNU grep's -q option. USG-style grep also lacked -q but its -s option behaved like GNU grep. Portable shell scripts should avoid both -q and -s and should redirect standard and error output to /dev/null instead. (-s is specified by POSIX.)
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