Note: When grep is called on more than one file, as in the above case, the output will also prepend the name of the file in which the match was found: a.txt:I say helloĪnd like most Unix tools, grep will read data that is piped in from another command-line tool. – will return all lines containing " hello" from all files (in the current directory) with a. Like other Unix tools, grep will accept shell expansions. – will print all lines that have the word " hello" in them. The most simple invocation involves two arguments: the pattern and the target file. Its full name, global regular expression print, obscures its simple yet powerful purpose: to "search a file for a pattern" Basic usage The grep tool is more than 40-years old and is ubiquitous (with some variations) across Unix systems.
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