QuickBits-9: Search String in files

1. To search for a string/regular expression in all files in a folder

grep -H "string" * 

This will print the matching line.
-H is for printing the matching filename.

2. To search for a string/regular expression in all files in a folder + subfolders

grep -H "string" * -r

3. To search for a string in all files of certain type

find . -name "pattern" -exec grep -H "string" {} \;



grep -H "string" $(find . -name "pattern")

Example: To find string "main" in all .c file

find . -name "*.c" -exec grep -H "main" {} \;



grep -H "main" $(find . -name "*.c")

QuickBits-8: Remove Duplicate Lines in a File

To Remove duplicate lines in a file and print it

 cat filename | sort | uniq  

sort will sort the lines and
uniq will remove adjacent duplicate lines.

To count the number of repetition of each line

 cat filename | sort | uniq -c