AWK IF ELSE block

nawk -F"," ' BEGIN{OFS=","} {if (NR==1) {
print "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXx"
} else {
print $1,$2,$3,$4,"S",1
print $1,$2,$3,$5,"S",2
print $1,$2,$3,$6,"D",1
print $1,$2,$3,$7,"D",2
}}' in.txt

Script to copy contents of file between two specific line patterns

Here is the script code to copy contents of files between two line patterns.

For example:
To copy the contents of file starting between the particular date and end date.

if [ $# -ne 3 ]; then
echo 1>&2 Usage: $0 file_to_parsed starting_pattern ending_pattern
exit 127
fi

startline=`grep -ni -m1 $2 $1 | awk -F ":" '{print $1}'`
endline=`grep -ni $3 $1 | tail -n1 | awk -F ":" '{print $1}'`

totallineno=`expr $endline - $startline + 1`
echo "Extracting contents between" $2 " and " $3
echo "No of lines found: " $totallineno
echo "Copying contents to temp file: " temp_file
echo "`head -n$endline $1 | tail -n $totallineno`" > temp_file
echo "Done copying."