另外uniq命令有4个有用的选项: \$uniq -d file 只输出file中的重复行，且只输出一次，但不输出唯一的行 \$uniq -u file 只输出file中的 ...

The first command we’ll examine in this post is a very unusual awk command that systematically removes every line in the file that is encountered more than once. It leaves the first instance of the ...

One of the truly great qualities of UNIX-like operating systems is their ability to combine multiple commands. By combining commands, you can perform a wide array of tasks, limited only by your ...