bash script to find pattern in text file and return entire line

I need to make a bash script which loops through a bunch of .txt files in a directory, then searches each .txt for a string, and returns the entire line that string appears on

I know how to look through all the .txt files in the directory,

I just need to be pointed in the right direction for searching the file itself, and ret开发者_开发技巧urning a line based on a match in that line

Within one dir

grep "search string" *.txt

Search or go to sub-dir

find /full/path/to/dir -name "*.txt" -exec grep "search string" {} ;\

you can use a loop:

for i in $(find|grep .txt); do grep "search" "$i"; If you also want to print the filename with each match, add -H to grep

One slight addition. Add -n to return the line.

      grep -rn "foo" *.txt 

See grep --help for more.