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you can try
sed '1s/abc/checker/' test > test1

consider a file is written with this

There are three cats
Cats colour is white
Dogs always attack cats


With a shell script I want to filter out file like this
Cats
Cats
Dogs Cats

How can I count FOUR letter word in a file

1. Write a shell script to print the file names of all files having .txt extension of a given directory after converting to uppercase letters. The input (directory name) should be given as command...