$ cat 1
qwer 1234 #@!$
$ fmt -1 1
qwer
1234
#@!$
(https://unix.stackexchange.com/questions/169995/rows-to-column-conversion-of-file)
man fmt
FMT(1) User Commands FMT(1)
NAME
fmt - simple optimal text formatter
SYNOPSIS
fmt [-WIDTH] [OPTION]... [FILE]...
DESCRIPTION
Reformat each paragraph in the FILE(s), writing to standard output.
The option -WIDTH is an abbreviated form of --width=DIGITS.
...
