sha256 command line utility

sha256

#!/usr/bin/env /bin/sh

# SHA 256 based on openssl
# 
# sha256 similar to the classic "md5sum" command line
#

if [ ${#} -gt 0 ]
then
    # iterate over all arguments
    while [ ${#} -gt 0 ]
    do
        if [ -f $1 ]
        then
            openssl sha -sha256 $1 | awk '{print $2}' -
        else
            echo $1 does not exist.
        fi
    shift
    done
else
    echo $0 files...
fi