What is grep used for?
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. "grep" was originally developed for the Unix operating system, but later available for all Unix-like systems and some others such as OS-9.
grep is a popular Unix command that is used to search plain-text data sets for lines that match a pattern or regular expression. grep (global regular expression print) was originally developed for the Unix operating system, but later available for all Unix-like systems.

An example of using the grep command to search for a keyword in a file: grep keyword file.txt

You can pipe the output of other commands into grep. For example, grep can be used to search a directory for a file: ls ~/Desktop | grep keyword
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
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(Optional) Context information is below.
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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. "grep" was originally developed for the Unix operating system, but later available for all Unix-like systems and some others such as OS-9.
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Answer the following query.
What is grep used for?

user
grep is a popular Unix command that is used to search plain-text data sets for lines that match a pattern or regular expression. grep (global regular expression print) was originally developed for the Unix operating system, but later available for all Unix-like systems.

An example of using the grep command to search for a keyword in a file: grep keyword file.txt

You can pipe the output of other commands into grep. For example, grep can be used to search a directory for a file: ls ~/Desktop | grep keyword
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