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grep -r "password" *
grep -r "password" *
ifconfig eth0 | grep -oiE '([0-9A-F]{2}:){5}[0-9A-F]{2}' # Show eth0 MAC address
ifconfig eth0 | grep -oiE '([0-9A-F]{2}:){5}[0-9A-F]{2}' # Show eth0 MAC address
grep -Eio '[a-z0-9._-]+@[a-z0-9.-]+[a-z]{2,4}' file.txt # Extract e-main addresses from file.txt
grep -Eio '[a-z0-9._-]+@[a-z0-9.-]+[a-z]{2,4}' file.txt # Extract e-main addresses from file.txt</source>
== Find files containing text pattern ==
grep -rnw '/path/' -e "pattern"
* r or -R is recursive,
* n is line number, and
* w stands match the whole word.
* l (lower-case L) can be added to just give the file name of matching files.
--exclude or --include parameter could be used for efficient searching. Something like below:
grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"
grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"
grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"