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The grep utility searches a pattern (regular expression) in a text file. There are many options to control how matches are performed and how to display matches.

The name grep comes from the ed (a Unix line editor) command g/re/p which means “globally search for a regular expression and print all lines containing it”.

External references

• grep specification (Single UNIX v3)
• GNU grep manual

Tutorials

• grep tutorial
• regular-expression.info

Further reading

• Convince grep to output all lines, not just those with matches
• Count total number of occurrences using grep
• Is there a way to modify a file in-place?
• How to grep standard error stream (stderr)?
• Show all the file up to the match
• grep and tail -f?

The grep utility searches a pattern (regular expression) in a text file. There are many options to control how matches are performed and how to display matches.

The name grep comes from the ed (a Unix line editor) command g/re/p which means “globally search for a regular expression and print all lines containing it”.

External references

• grep specification (The Open Group Base Specifications Issue 7, 2018 edition)
• GNU grep manual

Tutorials

• grep tutorial
• regular-expression.info

Further reading

• Convince grep to output all lines, not just those with matches
• Count total number of occurrences using grep
• Is there a way to modify a file in-place?
• How to grep standard error stream (stderr)?
• Show all the file up to the match
• grep and tail -f?

The grep utility searches a pattern (regular expression) in a text file. There are many options to control how matches are performed and how to display matches.

External references

• grep specification (Single UNIX v3)
• GNU grep manual

Tutorials

• grep tutorial
• regular-expression.info

Further reading

• Convince grep to output all lines, not just those with matches
• Count total number of occurrences using grep
• Is there a way to modify a file in-place?
• How to grep standard error stream (stderr)?
• Show all the file up to the match
• grep and tail -f?

The grep utility searches a pattern (regular expression) in a text file. There are many options to control how matches are performed and how to display matches.

The name grep comes from the ed (a Unix line editor) command g/re/p which means “globally search for a regular expression and print all lines containing it”.

External references

• grep specification (Single UNIX v3)
• GNU grep manual

Tutorials

• grep tutorial
• regular-expression.info

Further reading

• Convince grep to output all lines, not just those with matches
• Count total number of occurrences using grep
• Is there a way to modify a file in-place?
• How to grep standard error stream (stderr)?
• Show all the file up to the match
• grep and tail -f?

The grep utility searches a pattern (regular expression) in a text file. There are many options to control how matches are performed and how to display matches.

External references

• grep specification (Single UNIX v3)
• GNU grep manual

Further reading

• Convince grep to output all lines, not just those with matches
• Count total number of occurrences using grep
• Is there a way to modify a file in-place?
• How to grep standard error stream (stderr)?
• Show all the file up to the match
• grep and tail -f?

The grep utility searches a pattern (regular expression) in a text file. There are many options to control how matches are performed and how to display matches.

External references

• grep specification (Single UNIX v3)
• GNU grep manual

Tutorials

• grep tutorial
• regular-expression.info

Further reading

• Convince grep to output all lines, not just those with matches
• Count total number of occurrences using grep
• Is there a way to modify a file in-place?
• How to grep standard error stream (stderr)?
• Show all the file up to the match
• grep and tail -f?