实例：ln -s /home/gamestat /gamestat
linux下的软链接类似于windows下的快捷方式
ln -s a b 中的 a 就是源文件，b是链接文件名,其作用是当进入b目录，实际上是链接进入了a目录
如上面的示例，当我们执行命令 cd /gamestat/的时候 实际上是进入了 /home/gamestat/
值得注意的是执行命令的时候,应该是a目录已经建立，目录b没有建立。我最开始操作的是也把b目录给建立了，结果就不对了
删除软链接：
rm -rf b 注意不是rm -rf b/
ln a b 是建立硬链接
建立链接的使用方法如下：
[root@WEB_YQ_64_79 /]# ln --help
Usage: ln [OPTION]... [-T] TARGET LINK_NAME (1st form)
or: ln [OPTION]... TARGET (2nd form)
or: ln [OPTION]... TARGET... DIRECTORY (3rd form)
or: ln [OPTION]... -t DIRECTORY TARGET... (4th form)
In the 1st form, create a link to TARGET with the name LINK_NAME.
In the 2nd form, create a link to TARGET in the current directory.
In the 3rd and 4th forms, create links to each TARGET in DIRECTORY.
Create hard links by default, symbolic links with --symbolic.
When creating hard links, each TARGET must exist.
Mandatory arguments to long options are mandatory for short options too.
--backup[=CONTROL] make a backup of each existing destination file
-b like --backup but does not accept an argument
-d, -F, --directory allow the superuser to attempt to hard link
directories (note: will probably fail due to
system restrictions, even for the superuser)
-f, --force remove existing destination files
-n, --no-dereference treat destination that is a symlink to a
directory as if it were a normal file
-i, --interactive prompt whether to remove destinations
-s, --symbolic make symbolic links instead of hard links
-S, --suffix=SUFFIX override the usual backup suffix
-t, --target-directory=DIRECTORY specify the DIRECTORY in which to create
the links
-T, --no-target-directory treat LINK_NAME as a normal file
-v, --verbose print name of each file before linking
--help display this help and exit
--version output version information and exit
The backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.
The version control method may be selected via the --backup option or through
the VERSION_CONTROL environment variable. Here are the values:
none, off never make backups (even if --backup is given)
numbered, t make numbered backups
existing, nil numbered if numbered backups exist, simple otherwise
simple, never always make simple backups
Report bugs to <bug-coreutils@gnu.org>.