摘要：
grep --help备忘录 Usage: grep [OPTION]... PATTERN [FILE]...Search for PATTERN in each FILE or standard input.PATTERN is, by default, a basic regular expr 阅读全文
摘要：
使用tail --help查看命令用于备忘 tail [ -f ] [ -c Number | -n Number | -m Number | -b Number | -k Number ] [ File ] Usage: tail [OPTION]... [FILE]...Print the la 阅读全文