touch text1.txt

for i in `seq 50000`;do echo $RANDOM | md5sum | cut -c 1-9 ;done >> text1.txt

export LC_ALL=C

sort text1.txt  | uniq

sort -n text1.txt | uniq

sort text1.txt  | uniq > letter.txt

sort -n text1.txt | uniq >> number.txt



echo -e "computer\ndata\nscience\nengineering\nscience\nengineeringc\ncomputer\ncomputer\necnu\ndata" > text2.txt

grep computer text2.txt

grep -c computer text2.txt