Script says to execute

snert:~/downloads/jboss-as-web-7.0.0.Final hrupp$ bin/jboss-admin.sh -c --file=scripts/secure-standalone-mgmt.cli
File /Users/hrupp/Downloads/jboss-as-web-7.0.0.Final/scripts/secure-standalone-mgmt.cli doesn't exist.

which fails.

Also the description in the file fails to mention that the server must be started for this (or alternatively to start the server, but as it a cli script, this is probably not expected).