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Can you try this one:

#! /bin/ksh
IPLIST=`cat ./pinglist1.txt`
for ip in $IPLIST
do
echo $ip
ping -c 2 $ip >>log.txt
if [[ $? -eq 0 ]]
then
print $ip "PINGS">>pingresults.txt
else...

Well there are lot of options, trimming leading zeroes and doing compare..
below is one of the option..
chk_sum=`tail -1 $FILE_NAME | cut -d~ -f7 | cut -c2-|awk '{print "%.5f",$0}'`

I believe you are saying about the varying pattern when you mention multiple files/columns.
Can you prepare pattern file based on no. of columns just before doing grep ?

And use grep -v -f...

For the point 1, since you are assuming that there will be always header and footer, not sure why you need to read whole file NAM2008101601.OUT to get record count.

Can you try using file size...

Looks more like ping syntax

Are you trying to do 2 echoes to ip, if so

ping -c 2 $ip | awk '/100%/ {print "no"}' |read Pingable

How about first joining the file

join -t"|" 1.txt 2.txt|awk 'BEGIN{FS="|"} $2!=$9 {print 2,$9}'

Above does for field 2,Similarly need to do for other fields This is assuming 8 fields are there...

not working at all?
Can you tell what is the expected output and provide what you tried?

How about using grep and grep -v, might be something like below can work
grep "^[a-z0-9]*-[a-z0-9]*-[0-9]*$" <inputfile> >goodFile
grep -v "^[a-z0-9]*-[a-z0-9]*-[0-9]*$" <inputfile> >badFile

or you can just use
read sql script into a string variable sqltext,
db2 -x +w <sqltext>

Assuming your sql scripts are @ delimited
You might want to provide full path for db2 command,
#!/bin/ksh
db2 -td@ -vf script_1
db2 -td@ -vf script_2 &
db2 -td@ -vf script_3 &
db2 -td@ -vf...

awk '{ print substr($0,1,120)"\n"substr($0,121)}' <filename> > outfilename

print $file1 and $UNIQDIR to make sure you have full path.

why do you need redirection ">"

How about setting alias?

alias dir1="cd /home/username/directory1"
alias temp3="cd /home/username/directory1/temp1/temp2/temp3"

then just enter dir1 to goto directory1, temp3 to temp3 folder.

Can you provide sample expected output.

Are you looking for something like below ?

cat `ls -l|sort -n +4|tail -1|awk '{print $9}'`

Can you give a provide the file content.

One more option

sed 's/[^|]//g' <filename>|wc -c

you need to add logic to loop through multiple files, and if the above command gives 14, you can print the file name.

How about using awk, printing it $1, $2..

e.g.
trackingnum=echo $line|awk '{print $1}'

How about this, assuming you need to append stuff at 2nd line.

sed '2 s|"$|test.ear&|' < file.txt