曾经对软硬连接一直搞不明白，关键是怕操作错误。
硬链接不能跨区实现连接，硬链接是对原始文件的镜像，同一个inode，软连接是快捷方式，inode保存的是快捷方式的。原始文件删除，导致软连接文件无效。
01、硬链接
02、软连接
对目录的链接
[root@dzswj-test tmp]#ll total 16 drwxr-xr-x 3 root root 4096 Jul 12 14:44 gitdev drwxr-xr-x 2 resin resin 4096 Aug 10 10:59 hsperfdata_resin drwx------ 2 gdm gdm 4096 Oct 4 14:41 orbit-gdm drwx------ 2 gdm gdm 4096 Oct 4 14:42 pulse-D9BRMMarTPJX [root@dzswj-test tmp]# [root@dzswj-test tmp]# [root@dzswj-test tmp]#ln -sv /usr/local/bin . //软连接，方原始路径需写绝对路径 `./bin' -> `/usr/local/bin' [root@dzswj-test tmp]#ll total 16 lrwxrwxrwx 1 root root 14 Oct 4 18:15 bin -> /usr/local/bin //清晰看到链接指向 drwxr-xr-x 3 root root 4096 Jul 12 14:44 gitdev drwxr-xr-x 2 resin resin 4096 Aug 10 10:59 hsperfdata_resin drwx------ 2 gdm gdm 4096 Oct 4 14:41 orbit-gdm drwx------ 2 gdm gdm 4096 Oct 4 14:42 pulse-D9BRMMarTPJX [root@dzswj-test tmp]#ll bin/ bin目录下的文件 total 29048 -rwxr-xr-x. 1 root root 266821 Apr 15 2016 memcached -rwxr-xr-x 1 root root 1234088 Aug 15 2016 rar -rwxr-xr-x 1 root root 5587865 May 16 2016 redis-benchmark -rwxr-xr-x 1 root root 22185 May 16 2016 redis-check-aof -rwxr-xr-x 1 root root 7823836 May 16 2016 redis-check-rdb -rwxr-xr-x 1 root root 5714129 May 16 2016 redis-cli lrwxrwxrwx 1 root root 12 May 16 2016 redis-sentinel -> redis-server -rwxr-xr-x 1 root root 7823836 May 16 2016 redis-server -rwxr-xr-x 1 root root 8807 May 26 2016 tclsh8.5 -rwxr-xr-x 1 root root 1234088 Aug 15 2016 unrar