filter-save - Event saver
filter-save: [<file>]
filter-save: |[cmd]
filter-save writes all events to a file. This can be useful to repeat
the same event flow later.
file Name of the destination file; the default is the standard
output.
cmd If the specified name starts with a |, the following string is
executed as a command and the filter output is piped into the
new process’ stdin.
input-file(7)