centos linux HowTo - Linux / Unix Q & A from nixCraft

Linux Change Password Using passwd Command Over SSH

last updated January 7, 2018 in Commands, Linux, OpenBSD, UNIX

I‘m a new Ubutnu Linux user. I backup files to our corporate Unix backup server using the rsync command. The server only allow to upload/download files. I am unable to login to the server. How do change my password using the passwd command over ssh based session?

Install and Use nmon Tool To Monitor Linux Systems Performance

last updated October 3, 2012 in Linux

How do I install nmon command under Linux operating systems to find out performance information for my CPU, memory, network, disk, virtual memory, top process and other part of my HP server running on Debian Linux or CentOS Linux 6.x amd64 bit server?

RHEL / Centos Linux Disable Firewall Command

last updated November 18, 2019 in CentOS, Iptables, RedHat and Friends, Security

How do I disable firewall on CentOS or Red Hat Enterprise Linux server version 5.x/6.x running on my HP micro server?

Linux / Unix Shell: Set Default Printer

last updated January 29, 2012 in UNIX

How do I set default printer in my Bash shell under CentOS Linux or FreeBSD unix desktop operating systems?

RHEL 6 / CentOS 6: Install Adobe Flash Player For Firefox Browser

last updated September 8, 2016 in CentOS, RedHat and Friends

U‘m using RHEL 6.x workstation with Mozilla Firefox 3.x. How do I install flash player so that I can use video site such as You-tube under RHEL 6.x or CentOS Linux 6.x 64bit operating systems?

yum Command Hangs on Running Transaction Test Message Error and Solution

last updated July 1, 2011 in CentOS, RedHat and Friends

When I run ‘yum install package‘ or ‘yum update‘ commands the yum command works normally until Running Transaction Test and hangs until the yum process is killed manually using the kill command. How do I fix this problem under CentOS Linux 5.x AMD64 running on HP server?

RHEL 6: Change OpenSSH Port To 1255 ( SELinux Config )

last updated May 13, 2011 in RedHat and Friends

I’ve edited /etc/ssh/sshd_config to change the port number:

Port 1255

However, I’m getting an error as follows:

sshd[26792]: error: Bind to port 1255 on 192.168.1.100 failed: Permission denied

How do I change default OpenSSH port number from 22 to 1255 under RedHat Enterprise Linux server version 6 and SELinux?