paste - merge corresponding or subsequent lines of files
paste [-s] [-d list] file ...
The paste(1) utility concatenates the corresponding lines of the given input files, replacing all but the last file's newline characters with a single tab character, and writes the resulting lines to standard output. If end-of-file is reached on an input file while other input files still contain data, the file is treated as if it were an endless source of empty lines.
The options are as follows:
The following special characters can also be used in list:
Any other character preceded by a backslash (\) is equivalent to the character itself.
If a hyphen (-) is specified for one or more of the input files, the standard input is used; standard input is read one line at a time, circularly, for each instance of -
The paste(1) utility exits 0 on success, and >0 if an error occurs.