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grep pattern filenameHere, `pattern` is the regular expression or string that you want to search for, and `filename` is the name of the file(s) that you want to search in. `grep` can be used with various options to customize its behavior. For example, you can use the `-i` option to perform a case-insensitive search, the `-r` option to search recursively in directories, and the `-n` option to display line numbers for matching lines. Here are some examples of using `grep`: 1. To search for the word "hello" in a file called `file.txt`:
grep hello file.txt2. To search for the word "hello" in all files in the current directory and its subdirectories:
grep -r hello .3. To search for the word "hello" in a case-insensitive manner:
grep -i hello file.txt4. To display the line numbers for matching lines:
grep -n hello file.txtThese are just a few examples of how `grep` can be used. There are many more options and use cases for this powerful command-line tool.
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