for ((i=1;i<=100;i++)) >do echo $RANDOM | md5sum | cut -c 1-40 >>test.txt >done sort test.txt | uniq -u sort -n test.txt | uniq -u sort -n test.txt > test2.txt sort test.txt > test3.txt grep -c cc test.txt //因为没有computer字符串所以用cc来代替 grep -n cc test.txt