paste – Merge lines of files.
Paste writes the lines from files in parallel and sequential manner in the screen. By default, Lines will be separated by a TAB character.
$ paste f1 f2 f3 — Contents of the f1,f2 & f3 will be pasted in parallel and lines are separated by TABs.
$ paste -d’#’ f1 f2 f3 — Same as above. But # is the separator.
$ paste -d’@#’ f1 f2 f3 — Same as above. But the separator for f1 & f2 is @ and for f2 & f3 is #.
$ paste -s f1 f2 — Paste one file at a time instead of in parallel (as in above commands)
$ paste num word > myfile — Paste the content of num & word and write the output into myfile.
Read : man paste