unexpand - it is used to convert blanks in each FILE to tabs, writing to standard output

syntax $ unexpand [OPTION] [FILE]

To convert blanks in a file to tabs and write the output to stdout $ unexpand sample.txt

To write the output to a file $ unexpand sample.txt > unexpand_output.txt

To convert blanks to tabs, reading from standard output $ unexpand

To convert all blanks, instead of just initial blanks $ unexpand -a sample.txt

To convert only leading sequences of blanks $ unexpand --first-only sample.txt

To have tabs a certain number of characters apart $ unexpand -t 4 sample.txt

To mention multiple tab positions $ unexpand -t 5,10,15 sample.txt

regards, T.Dhanasekar