Only after all this has happened, grep is called with this list of arguments (note that the same happens with your original commands grep never gets to see the * expanding that is completely done by bash before calling grep). cs files), you'll get the command: grep -r "some string" /code/internal/dev/file1.cs /code/internal/dev/file2.cs /code/public/dev/file3.cs /code/tools/file4.cs /code/tools/file5.cs Therefore given your hierarchy (and making up file names for the. grep was originally developed for the Unix operating system, but later available for all Unix-like systems and some others such as OS-9. You already know that for the *.cs part, but it also works for intermediate directories moreover, if a / follows, only directories are matched. grep is a command-line utility for searching plain-text data sets for lines that match a regular expression.Its name comes from the ed command g/re/p (globally search for a regular expression and print matching lines), which has the same effect. So after brace expansion, your command looks like this: grep -r "some string" /code/*/dev/*.cs /code/tools/*.cs In other words, grep command searches the given file for lines containing a match to the given strings or words. It is used to search text and strings in a given file. If you want to make maximal use of wildcards (and the hierarchy you posted is complete), you can do grep -r "some string" /code/ How can I use grep command on Unix operating systems Can you give me a simple examples of the grep command Grep is an essential Linux and Unix command.
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