Scripting for /bin/ksh

[Todd Gruhn <tgruhn2%gmail.com@localhost>]

I am attempting to write some ksh-scripts that invoke "borg" .
How does one tell ksh to cat the 2 vars together and invoke the
resulting command?

$foo  <--> /umass1/BORG-REPOS
$FIRSThalf <--> borg-3.8 list
$cmd= $FIRSThalf  . $foo  #thats how it is coded in PERL

execute $cmd

I never learned much about /bin/ksh -- I jumped straight into PERL.
Anyone know of some good PDFs regarding this?

Any help will be appreciated.