-q 参数，本意是 Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. 中文意思为，安静模式，不打印任何标准输出。如果有匹配的内容则立即返回状态值0。http://www.cndba.cn/hbhe0316/article/107881http://www.cndba.cn/hbhe0316/article/107881

[root@node02:/home/test]$ cat 111.txt
hello
[root@node02:/home/test]$ cat check.sh
#!/bin/sh
grep -q "hello" 111.txt
if [[ $? == 0 ]];then
        echo "hello in 111.txt"
else
        echo "hello does not in 111.txt"
fi

grep -q "hello1" 111.txt
if [[ $? == 0 ]];then
        echo "hello1 in 111.txt"
else
        echo "hello1 does not in 111.txt"
fi

[root@node02:/home/test]$ sh check.sh
hello in 111.txt
hello1 does not in 111.txt

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shell