+Use C<command E<lt>spaceE<gt> | command> to pipe the output of the
+first command (a guestfish command) to the second command (any host
+command). For example:
+
+ cat /etc/passwd | awk -F: '$3 == 0 { print }'
+
+(where C<cat> is the guestfish cat command, but C<awk> is the host awk
+program). The above command would list all accounts in the guest
+filesystem which have UID 0, ie. root accounts including backdoors.
+Other examples:
+
+ hexdump /bin/ls | head
+ list-devices | tail -1
+
+The space before the pipe symbol is required, any space after the pipe
+symbol is optional. Everything after the pipe symbol is just passed
+straight to the host shell, so it can contain redirections, globs and
+anything else that makes sense on the host side.
+
+To use a literal argument which begins with a pipe symbol, you have
+to quote it, eg:
+
+ echo "|"
+
+=head1 EXIT ON ERROR BEHAVIOUR
+
+By default, guestfish will ignore any errors when in interactive mode
+(ie. taking commands from a human over a tty), and will exit on the
+first error in non-interactive mode (scripts, commands given on the
+command line).
+
+If you prefix a command with a I<-> character, then that command will
+not cause guestfish to exit, even if that (one) command returns an
+error.
+
+=head1 GUESTFISH COMMANDS
+
+The commands in this section are guestfish convenience commands, in
+other words, they are not part of the L<guestfs(3)> API.