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Search Text in Directory Files

>> grep -r "Searching_Text" *

Grep File Name Pattern Search Text

>> grep -r --include "*.txt" texthere .
>> grep -r ----exclude "*.txt" texthere .

Search to Subfolder recursively Text in File

>> grep -R 'string' dir/
>> find dir/ -type f -exec grep -H 'string' {} +

Check Library Architecture Linux

>> objdump -f libfoo.a | grep ^architecture