pr --help
pr --version
cat abc.txt
pr -3 abc.txt
pr -d abc.txt
pr -n abc.txt
pr -t abc.txt
seq 16 | pr -4t
seq 16 | pr -4ts
seq 16 | pr -4ts,
seq 16 | pr -4ts' : '
seq 16 | pr -4ts:
seq 16 | pr -4ts,
seq 16 | pr -4ats,
seq 16 | pr -4ats:
seq 16 | paste -d, - - - -
seq 16 | paste -d, - - - seq 16 | paste -d, - -