Convert integral bytes ot human friendly format. Reads number of bytes from stdin or argument or both using '-' for replacement

human-bytes.sh

#!/bin/bash

function human-bytes {
  numfmt --to=iec-i --suffix=B --padding=7 "$@"
}

if [ "$#" -eq 0 ]
then
# Is stdin a terminal?
if [ -t 0 ]; then
cat << EOF
Prints bytes in more human-readable form.
  
  Usage: human-bytes bytes [more-bytes]

Where bytes should be a number of bytes, or '-' to read from stdin.
EOF
else
  while read line
    do
      human-bytes $line
    done
fi
fi

for arg in "$@"
do
  if [ $arg == "-" ]
  then
    while read line
    do
      human-bytes $line
    done
  else
    human-bytes $arg
  fi
done