I need to index my site everyday, but Admin GUI should not be accessible from outside. Can I index my site through command line, and should dowalk/dowalk.vtx be available for indexing.
You need the gui for setting the config. But the walk can be started from the command line by hand. See using dowalk in the manual. Location of the dowalk script isn't critical unless you want to access from web for the gui. Then it has to be somewhere under the script root defined in INSTALLDIR/texis.cnf
dowalk contains a function called "protectsite" you can modify to prevent it's use from anywhere but your ip or network.