Tr command in linux

                                  Tr command in Linux

tr is a command in Unix and Unix-like operating systems. It is an abbreviation of translate or transliterate, indicating its operation of replacing or removing specific characters in its input data set

• change one word to other 

             cat a.txt | tr o X

(i changer every o with capital x(X)

• change Upper to upper or lower to upper case

             cat a.txt | tr [:upper:] [:lower:]

• change Upper to lower or upper to upper case

             cat a.txt | tr [:lower:] [:upper:]

• you can use the following command to change all lower case letters to upper case in a file as shown

                cat a.txt | tr [a-z] [A-Z]

• you can save the results written to stdout in a file for use the shell’s o/p 

            cat a.txt | tr [a-z] [A-Z] >ab.txt

            cat ab.txt

• you can use the -d flag to delete characters

            cat a.txt | tr -d '' 

• If there are repeated characters in a sequence (for instance double spaces) in the text you are processing, you can use the -s option to squeeze the characters leaving only one occurrence of it.

         cat a.txt | tr -s '' 

• Related to the previous example, you can also translate multiple lines of words into a single sentence as shown.

              tr "\n" " " < a.txt

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