etect a livecd system, return 0 on success, 1 otherwise

islivecd.bash

# detect a livecd system, return 0 on success, 1 otherwise


function islivecd()
    grep boot=live /proc/cmdline >/dev/null && return 0
    grep boot=casper /proc/cmdline >/dev/null && return 0
    return 1
}