Adds newline-separated integers from stdin until EOF then output the total to stdout.
Ignores whitespace-only lines.
Logs non-integer lines to stderr.
go get -u github.com/therealplato/add
total bytes in /etc/*
files:
$ find /etc/ -type f | xargs stat --format '%s' | add
find: ‘/etc/cups/certs’: Permission denied
3125911