...
file copy "https://cdn.juniper.net/xxxxxxx/jinstall-ppc-18.4R1.8-signed.tgz?/xxxxx /var/tmp/jinstall-ppc-18.4R1.8-signedimage-name.tgz
request system software validate /var/tmp/jinstallimage-ppc-18.4R1.8-signed.tgzname.tgz
request system software add /var/tmp/jinstallimage-ppc-18.4R1.8-signed.tgzname.tgz
request system reboot
