# 1. 使用文件 /oradata2/yct/rc.local 进行测试

[oracle@sbdatabase yct]$ pwd

/oradata2/yct

[oracle@sbdatabase yct]$ ll

total 4

-rwxr-xr-x 1 oracle dba 220 Dec  9 16:30 rc.local

[oracle@sbdatabase yct]$ more rc.local

#!/bin/sh

#

# This script will be executed *after* all the other init scripts.

# You can put your own initialization stuff in here if you don't

# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local

# 2. 进行硬链接，inode 数增加

[oracle@sbdatabase yct]$ ln rc.local rc.local_hard.ln

[oracle@sbdatabase yct]$ ll

total 8

-rwxr-xr-x 2 oracle dba 220 Dec  9 16:30 rc.local

-rwxr-xr-x 2 oracle dba 220 Dec  9 16:30 rc.local_hard.ln

# 3. 进行符号链接，inode数并没有增加[oracle@sbdatabase yct]$ ln -s rc.local rc.local_soft.ln

[oracle@sbdatabase yct]$ ll

total 8

-rwxr-xr-x 2 oracle dba 220 Dec  9 16:30 rc.local

-rwxr-xr-x 2 oracle dba 220 Dec  9 16:30 rc.local_hard.ln

lrwxrwxrwx 1 oracle dba   8 Dec  9 17:03 rc.local_soft.ln -> rc.local

# 4. 删除原文件后，硬链接仍可用，而符号链接失效。

[oracle@sbdatabase yct]$ rm rc.local

[oracle@sbdatabase yct]$ ll

total 4

-rwxr-xr-x 1 oracle dba 220 Dec  9 16:30 rc.local_hard.ln

lrwxrwxrwx 1 oracle dba   8 Dec  9 17:03 rc.local_soft.ln -> rc.local

[oracle@sbdatabase yct]$ more rc.local_hard.ln

#!/bin/sh

#

# This script will be executed *after* all the other init scripts.

# You can put your own initialization stuff in here if you don't

# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local

[oracle@sbdatabase yct]$ more rc.local_soft.ln

rc.local_soft.ln: No such file or directory

# 5. 硬链接不能链接目录

[oracle@sbdatabase yct]$ rm -r *

[oracle@sbdatabase yct]$ ll

total 0

[oracle@sbdatabase yct]$ mkdir t1

[oracle@sbdatabase yct]$ ln t1 t1_hard.ln

ln: `t1': hard link not allowed for directory

[oracle@sbdatabase yct]$ ln -s t1 t1_soft.ln

[oracle@sbdatabase yct]$ ll

total 4

drwxr-xr-x 2 oracle dba 4096 Dec  9 17:09 t1

lrwxrwxrwx 1 oracle dba    2 Dec  9 17:09 t1_soft.ln -> t1

[oracle@sbdatabase yct]$