CentOS / RHEL: Delete Old Yum Repositories and Configuration Files
Posted on in Categories RedHat and Friends last updated July 15, 2011
How do I delete old yum repositories and configuration files under RHEL 5 or CentOS Linux server?
Tag: configuration files
UNIX: Lynx Browser Set / Change the Default Home Page
Posted on in Categories UNIX last updated April 25, 2011
How do I change the default home page with Lynx browser under UNIX or Linux operating system? How do I set the startup page to http://google.co.uk with Lynx?
Linux Find Out My Machine Name/Hostname
Posted on in Categories CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse, Ubuntu Linux last updated January 8, 2018
How do I find out my server name (machine name) under Linux operating systems using command shell?
Force SSH Client To Use Given Private Key ( identity file )
Posted on in Categories OpenBSD last updated May 17, 2010
Recently, my desktop hard disk crashed. So I reinstalled Linux and created a new set of private RSA keys for authentication. However, two of my remote UNIX servers still uses old DSA keys. I do not remember root password for those servers. I do have backup of private and public DSA keys and currently stored in /backup/home/user/.ssh/id_dsa and /backup/home/user/.ssh/id_dsa.pub. How do I force my ssh clients to use identity file /backup/home/user/.ssh/id_dsa to get back to my remote UNIX servers?
Linux: Configure Xorg X11 Window System
Posted on in Categories Linux, X Server last updated May 13, 2010
My xorg.conf file is missing as I deleted accidentally for some reason. Now, Xorg try to probe my hardware on every startup. How do I configure Xorg under Debian or any Linux distro / operating systems?
Start / Stop / Restart Postfix Mail Server
Posted on in Categories EMail Servers last updated June 23, 2011
How do I start / stop / restart my postfix mail server under Linux or UNIX operating systems?
Linux / UNIX Restrict at / cron Usage To Authorized Users
Posted on in Categories CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Security, Suse, Ubuntu Linux, UNIX last updated July 18, 2009
The cron and at services are used to allow commands to be executed at a later time. How do I restrict them to selected users such as root, opt1, opt2 and so on? How do I make sure user php can run php script but cannot modify or install a new job?