Replace a filename with the standard input.
Separate columns with
char instead of a tab.
char can be any regular character or the following escape sequences:
You can separate columns with different characters by supplying more than one
Merge subsequent lines from one file.
Create a three-column file from files
x y z
List users in two columns:
who | paste - -
Merge each pair of lines into one line:
paste -s -d"\t\n" list