grep -rnw ‘/path/to/somewhere/‘ -e ‘pattern‘
-r or -R is recursive,
-n is line number, and
-w stands for match the whole word.
-l (lower-case L) can be added to just give the file name of matching files.
https://stackoverflow.com/a/16957078/8025086
原文：https://www.cnblogs.com/buxizhizhoum/p/12070642.html