Grep text in files

Linux search for line in file

grep -R "keyword" /directory/

Bash find all files containing string

grep -r '/path/to/somewhere/' -e 'pattern'

Grep text in files

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.
-e is the pattern used during the search

Source: stackoverflow.com

Bash find term in files

grep "some string" . -R

Source: superuser.com

Grep in file content

grep -rnw '/path/to/somewhere/' -e 'pattern'

Source: stackoverflow.com

Grep string in file

if grep -Fxq "pattern_to_search" file.txt; then #check if pattern string in file
  #do something
fi

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