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cat >> registerFile.txt << EOF
FirstName|LastName |DOB|EmailId|Contact No
Pranay|Pawar|15-07-2002|[email protected]|9067620123
Monish|Rajendran|27-02-2001|[email protected]|9284456601
Raj|Mishra|12-09-2001|[email protected]|8788478341
Abhay|Tomar|07-09-2000|[email protected]|7535026201
EOF

cat >> flightDetails.txt << EOF
FlightName|Origin|Destination|TravelDate|Price
SpiceJet757|CHN|HYD|3Jan|10000
AkasaAir123|DEL|BGL|3Jan|9000
Indigo667|DEL|HYD|3Jan|13000
AIRIndia667|DEL|HYD|3Jan|16000

awk 'FS="|" {if($2=="DEL" && $3=="BGL" && $4=="3Jan"){print $0}}' flightDetails.txt

awk 'FS="|" {if(NR>1){print $0}}' flightDetails.txt | sort -t '|' -k 5,5nr