Posted on 05 Jul 2005 by Ray Heffer
To check which kernel version you are running use uname -r
# uname -r
To find out which CentOS (or RedHat) release is installed have a look at /etc/redhat-release
To check disk space used / free use the df command and it will display each volume. The -h switch turns the bytes reading into GB to make it more readable.
# df -h
If you want to check the size of a particular directory then use:
# du -sh /
To configure which DNS servers your Linux server will use you need to edit /etc/resolv.conf
# vi /etc/resolv.conf
Just add each name server as a new line as in the following example:
nameserver
nameserver
You’ll find the hostname of the server in two places: /etc/hosts and /etc/sysconfig/network.
# vi /etc/hosts
and
# vi /etc/sysconfig/network
This is equivilant to the Windows Task Manager, and will show each process and the consumed CPU and RAM usage. Very useful!
# top
This command will display the processor type and speed.
# cat /proc/cpuinfo
Use the history command with grep to find previously entered commands.
# history | grep command
# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
# makemap hash /etc/mail/virtusertable.db < /etc/mail/virtusertable
# iptables-save > /etc/sysconfig/iptables
Tagged with: linux
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