They are shell commands, executed by /bin/[ (see man test). First one checks that ${prefix}/sbin/dhcpd exists and is +x, the second that the PID file exists and is readable... The escapes are needed to protect [ and $ from tcl (${prefix} is a tcl variable evaluated when the Portfile runs, ${PID} is a sh variable evaluated each time the startupitem runs. Thanks, Eric On Mar 29, 2007, at 12:04 PM, markd@macports.org wrote:
I am trying to understand the startupitems in the dhcp port because I want to do somewthing similar in another port. Can someone explain what the escapes, brackets, "-x", and "-r" do? And what interprets the "-x" and "-r"? The shell?
startupitem.create yes startupitem.name dhcpd startupitem.init "PID=/var/run/dhcpd.pid" startupitem.start "\[ -x ${prefix}/sbin/dhcpd \] && ${prefix}/sbin/dhcpd -cf ${prefix}/etc/dhcp/dhcpd.conf -lf ${prefix}/var/db/dhcpd/dhcpd.leases" startupitem.stop "\[ -r \${PID} \] && kill \$(cat \${PID})"
Mark
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