Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Check the number of active Apache connection
Answer:
When your Apache server is overloaded, you might want to check how many active connections are there.
# netstat -anpt|grep apache2 |grep ESTABLISHED
Replace apache2 with httpd if you are using CentOS/Fedora/RHEL.
Open UTF8 file with Vim
Answer:
If you opened an UTF-8 file, you need to let vim know by using the command below, after entering the command mode by pressing Esc + :
: set encoding=utf8
Use an alternative port when connecting to remote server using SSH
Answer:
Sometimes the SSH server port is not the standard 22 for security reason. So when you connect it, you need to specify the alternative port used with the -p argument.
E.g.
# ssh -p 12345 [email protected]
Clear screen in MySQL client
Answer:
To clear the screen of MySQL client, like the clear command in Linux, use the following tricks:
mysql> pager clear;
PAGER set to 'clear'
mysql> select 1; -- Magic Happened here!
mysql> nopager;
PAGER set to stdout
mysql>Mount a CDROM in Linux
Answer:
You can mount a CDROM using this command:
# mount /dev/cdrom /mnt/cdrom
Make sure you have created the mount point /mnt/cdrom beforehand.
