Merge pull request 'hw' (#1) from 10215501412/Computer-Systems-Labs:10215501412-patch-1 into master

Reviewed-on: https://gitea.shuishan.net.cn/52265903006/Computer-Systems-Labs/pulls/1

lab1/hw1.sh

@@ -0,0 +1,11 @@
+sort data.txt | uniq -u
+sort -n data.txt | uniq -u
+sort data.txt > data2
+sort -n data.txt > data3
+sort data.txt >> data2
+sort -n data.txt >> data3
+
+grep ABC data.txt
+grep -o ABC data.txt
+grep ABC data.txt | wc -l
+grep -o ABC data.txt | wc