Merge pull request '10215501451' (#8) from 10215501451/Computer-Systems-Labs:master into master

Reviewed-on: https://gitea.shuishan.net.cn/52265903006/Computer-Systems-Labs/pulls/8

10215501451.md

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+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