错误信息：
红帽RHEL5.5系统，重启网卡报错
[root@localhost network-scripts]# service network restart
Shutting down interface eth0: ./network-functions: line 78: .: ifcfg-eth0: file not found
[ OK ]
Shutting down loopback interface: ./network-functions: line 78: .: ifcfg-lo: file not found
[ OK ]
Bringing up loopback interface: ./network-functions: line 78: .: ifcfg-lo: file not found
Missing config file ifcfg-ifcfg-lo.
[ OK ]
Bringing up interface eth0: ./network-functions: line 78: .: ifcfg-eth0: file not found
Missing config file ifcfg-ifcfg-eth0.
[ OK ]
问题原因：
/etc/sysconfig/network-scripts/network-functions fails under bash 4.1.
The reason is that bash 4 fixed a bug in the source function (http://tiswww.case.edu/php/chet/bash/COMPAT) that cause the function to include the current directory in the path when sourcing files.
解决方法：
在78行中，修改 . $CONFIG 为 . ./$CONFIG
Line 78 in network-functions is ". $CONFIG" which means it wouldn't work if bash hadn't that bug.
It should be changed to ". ./$CONFIG" which solves the problem.