I have a need to replace all email addresses of form admin@xxxx.com or admin@yyy.net or admin@zzzzz.org with root@localhost in all files under several folders and all their sub-folders. How can […]

How to remove the last several characters of a string? I have not considered this problem until recently. It turns out there are quite a few methods to delete the […]

$a=df|grep vda1|awk ‘{print $5}’ Above is a typical error in Bash programming for bash newbies, especially for savvy programmers familiar with other languages but bash. There are two errors in […]

Bash function looks strange for people who are familiar with other programming languages such as C++, JAVA, etc. First, you seem to never see a bash function that has (formal) […]