Shell Programming and Scripting

Please let me know the meaning for the below statements in shell scripting.

1) exit -99
--------------------------------
2) set prgdir = `pwd`
set runFlag = runFlag:FALSE
-------------------------------------
3) if (-f $prgdir/maillst.eml) then
set distEmail = `cat $prgdir/maillst.eml`
endif
-----------------------------------
4) if (! -f $HOME/.mypw.$$ ) then
$prgdir/getpassword.sh $HOME/.mypw.$$
endif
------------------------------------------------
5) set UserId = `head -1 $HOME/.mypw.$$ | tail -1`
set PassWord = `tail -1 $HOME/.mypw.$$`
----------------------------------------------------
6) set runTmp = $<
-------------------------------
7) $myecho "lbuf: $lbuf\n dnsname: $dnsname -- srvOS: $srvOS -- sendFN: $sendFN\n
----------------------------------------
8) set putcmd = "scp -o StrictHostKeyChecking=no $sendFN $UserId"@"$dnsname":"$targetFN"
---------------------------------------------------------
9) set send_slow {10 .500}
spawn $putcmd
expect "*?assword*"
------------------------------------------------------
10) $prgdir/installCompliance.exp $dnsname $HOME/.mypw.$$ $targetFN $runFlag $ckJob $distEmail $forceEmail $TzFlag

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