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sources/talk/20141223 20 Linux Commands Interview Questions & Answers.md
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20条Linux命令面试问答
================================================================================
**Q:1 How to check current run level of a linux server ?**
**问:1 如何查看当前的Linux服务器的运行级别？**
Ans: ‘who -r’ & ‘runlevel’ commands are used to check the current runlevel of a linux box.
答: ‘who -r’ 和 ‘runlevel’ 命令可以用来查看当前的Linux服务器的运行级别。
**Q:2 怎么检查Linux的默认网关？**
**问:2 如何检查Linux的默认网关？**
Ans: Using the commands “route -n” and “netstat -nr” , we can check default gateway. Apart from the default gateway info , these commands also display the current routing tables .
答: Using the commands “route -n” and “netstat -nr” , we can check default gateway. Apart from the default gateway info , these commands also display the current routing tables .
**Q:3 How to rebuild initrd image file on Linux ?**
**问:3 How to rebuild initrd image file on Linux ?**
Ans: In case of CentOS 5.X / RHEL 5.X , mkinitrd command is used to create initrd file , example is shown below :
答: In case of CentOS 5.X / RHEL 5.X , mkinitrd command is used to create initrd file , example is shown below :
# mkinitrd -f -v /boot/initrd-$(uname -r).img $(uname -r)
@ -24,9 +24,9 @@ Above command will create the initrd file for the current version. To rebuild th
# dracut -f initramfs-2.x.xx-xx.el6.x86_64.img 2.x.xx-xx.el6.x86_64
**Q:4 What is cpio command ?**
**问:4 What is cpio command ?**
Ans: cpio stands for Copy in and copy out. Cpio copies files, lists and extract files to and from a archive ( or a single file).
答: cpio stands for Copy in and copy out. Cpio copies files, lists and extract files to and from a archive ( or a single file).
**Q:5 What is patch command and where to use it ?**