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tail +3 infile

I don't use awk much .. so you can try this code below
# !/usr/bin/sh

while read LINE
do

a=`echo $LINE | cut -d " " -f1`
b=`echo $LINE | cut -d " " -f2`
echo "set $a...

If awk seems a complicated topic , then u can try this below code
# !/usr/bin/sh

while read LINE
do
echo $LINE | cut -d " " -f 1 >> file4.txt
done < file.txt

count=`wc -l file4.txt |...

substr takes input arguments as start point and number of char to print.
Length option will give u the length of the whole string. Now in the awk statement the number of char is given by length-4 ,...

echo $SHELL .. will let u know which shell u r using , if it is not ksh, will give u a command not found