Risposte:
:%normal !!base64 -d^M
:{range}norm[al][!] {commands} *:normal-range*
Execute Normal mode commands {commands} for each line
in the {range}. Before executing the {commands}, the
cursor is positioned in the first column of the range,
for each line. Otherwise it's the same as the
":normal" command without a range.
{not in Vi}
Not available when |+ex_extra| feature was disabled at
compile time.
:g/./.!base64 -d