print service

The print command introduced in the previous releases allows printing unit configuration storage as key-value pairs. Output of this command is human-readable and suitable for machine parsing. To make sure that the command output is up to date, run the query command first:

# ram query ifconfig
$ ram print ifconfig
eth0.devname=eth0
eth0.enabled=eth0
eth0.hw_addr=08:00:27:CA:EF:21
eth0.ip_used=10.16.106.57
eth0.usedhcp=dhcp
eth2.devname=eth2
eth2.hw_addr=08:00:27:E6:C1:3B
eth2.usedhcp=dhcp
ifaces=eth0 eth2
lo.devname=lo
lo.enabled=lo

Since the release 0.2.0 of ram framework, it is possible to specify a key name as a print command argument to print only its value. The key name will not be included in the output. This feature is intended for shell scripts and designed to be shell-friendly. For example, lists are displayed as space separated strings which are suitable for using with the for shell construct. For boolean values, a missing key-value pair or an empty value indicate false and a non-empty value indicates true:

$ ram print ifconfig ifaces
eth0 eth2
$ ifaces=`ram print ifconfig ifaces`
$ for ifname in $ifaces do ram print ifconfig ${ifname}.hw_addr; done
08:00:27:CA:EF:21
08:00:27:E6:C1:3B
$ eth0=`ram print ifconfig eth0.enabled`
$ [ -n "$eth0" ] && echo "enabled" || echo "disabled"
enabled
$ eth1=`ram print ifconfig eth1.enabled`
$ [ -n "$eth1" ] && echo "enabled" || echo "disabled"
disabled
$ eth2=`ram print ifconfig eth2.enabled`
$ [ -n "$eth2" ] && echo "enabled" || echo "disabled"
disabled