grep

grep looks like regular expression matches in text, and is a very versatile tool.

Here is the GNU grep manual.

Here are some handy invocations:

• Look for a pattern in a tool's output: adb devices | grep device$
• Look for a fixed string under a directory: grep -RF feedback
• Include or exclude certain files: grep -RF --include '*.md' --exclude '*.html' feedback
• Find patterns but ignore case: grep -R content
• Print only the matching part: adb devices | grep -o '^[a-zA-Z0-9]*'
• Print lines that don't match: ls | grep -v PAT

grep is particularly useful when you stick to plain text.

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