您最多选择25个主题 主题必须以字母或数字开头,可以包含连字符 (-),并且长度不得超过35个字符
 

11 行
238 B

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