Search for duplicate strings in all files

Q: How do I search for a specific text string in a all files?

A: Say you want to find the string "sysadmin" in all files recursively in the folder /root/files.

# grep -R "sysadmin" /root/files/* > /root/files/sysadmin.txt

Saves all found duplicate lines to the file sysadmin.txt.

# sort -u /root/files/sysadmin.txt > /root/files/sysadmin.deduped.txt

Sorts and removes all duplicate lines, leaving one, then saves to the file sysadmin.deduped.txt.

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