| Flags | Description |
|---|
-d | To delete a given set of characters |
-t | To concat source set with destination set(destination set comes first; t stands for truncate) |
-s | To replace the source set with the destination set(s stands for squeeze) |
-c | This is the REVERSE card in this game, for eg. If you specify -c with -d to delete a set of characters then it will delete the rest of the characters leaving the source set which we specified (c stands for complement; as in doing reverse of something) |
cat file.txt | tr -s '[:lower:]' '[:upper:]'