1. 给如下文件nowcoder.txt，按照第二个字段排序：
ESTABLISHED 22
TIME_WAIT 9
LISTEN 3
2. 给如下文件nowcoder.txt，按照第二个字段的首字母排序：
ESTABLISHED APPLE
TIME_WAIT BANANA
LISTEN PEAR
3. 给如下文件nowcoder.txt，等号分割，按照第二个字段排序：
ESTABLISHED=22
TIME_WAIT=9
LISTEN=3
4. 给如下文件nowcoder.txt，等号分割，按照第二个字段的首字母排序：
ESTABLISHED=APPLE
TIME_WAIT=BANANA
LISTEN=PEAR
1. sort -k2 -rn
2. sort -k2 -r
3. sort -t "=" -k2 -rn
4. sort -t "=" -k2 -r
1. 使用一个echo命令，输出如下行：
Hello World!
Do you love me?
Yes, I love you!
2. 使用一个echo命令，输出如下行：
This is a beautiful world.
I like it very much!
Don't you think so?
3. 使用一个echo命令，输出如下行：
Hello World!
Don't you think so?
Yes, I love you!
1. echo -e "Hello World!\nDo you love me?\nYes, I love you!"
2. echo -e "This is a beautiful world.\nI like it very much!\nDon't you think so?"
3. echo -e "Hello World!\nDon't you think so?\nYes, I love you!"
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