Search the contents of files using grep

Search directory contents recursively using grep

Use find to search for filename patterns

Search matching files by combining find and grep with xargs

Search the contents of a git repository with git grep

Show context around matches using grep

Search for basic patterns using grep

Use grep's extended regular expressions to find complex patterns

Search for optional patterns with grep OR

Specify line beginning and end in patterns using grep

Match classes of characters using bracket expressions with grep

Search with groups using grep

Find matches excluding a pattern with grep

Use Grep for Fast Search from the Command Line

Sometimes you'll be looking for a string, but won't know which file it's in; or you'll want to find all usages of it within a directory. Learn how to use grep -r to recursively search all the files in a directory. 

grep

https://app.egghead.io/api/v1/lessons/tools-search-directory-contents-recursively-using-grep/transcript

Use Grep for Fast Search from the Command Line

Search directory contents recursively using grep

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