chmod command HowTo - Linux / Unix Q & A from nixCraft

How to disable ssh motd welcome message on Ubuntu Linux

last updated May 29, 2017 in Debian / Ubuntu, Linux, Ubuntu Linux

I want to disable the message of the day (motd) welcome message after I login over ssh on Ubuntu Linux. How do I disable motd on Ubuntu Linux 17.04?

How to copy permissions from one file to another on Linux

last updated March 16, 2016 in BASH Shell, CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse

I need to copy or clone file ownership and permissions from another file on Linux. Is there a bash command line option to clone the user, group ownership and permissions on a file from another file on Linux operating system?

Bash: .* Considered Harmful To Match Dot Files. Why?

last updated April 25, 2013 in BASH Shell, Linux, Troubleshooting, UNIX

How do I match dot files under Unix / Linux using bash shell? Why .* considered as harmful when matching dot files under bash shell?

SSH: WARNING: UNPROTECTED PRIVATE KEY FILE! Error and Solution

last updated January 26, 2017 in Amazon Cloud Computing, Linux, Mac OS X, OpenBSD, Suse, Troubleshooting, UNIX

I‘m setting up server on an Amazon EC2 compute instance powered by Suse Enterprise Linux server. I am using the following command to login into the my EC2 compute from OS X/Ubuntu desktop:

ssh -i suse-ec2-server-jp.pem root@ec2-xx-yy-zzz-yyy.compute-1.amazonaws.com

I am getting the following error:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: UNPROTECTED PRIVATE KEY FILE! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ Permissions 0440 for 'suse-ec2-server-jp.pem' are too open. It is recommended that your private key files are NOT accessible by others. This private key will be ignored. bad permissions: ignore key: suse-ec2-server-jp.pem Password:

How do I fix this problem and login using ssh command?

Linux Gnome: gconf-sanity-check-2 Exited With Status 256 Error and Solution

last updated September 8, 2016 in Gnome, Linux, UNIX

When I try to login into my Linux Gnome based desktop system, I get the following error from GDM :

gconf-sanity-check-2 exited with status 256

How do I fix this problem?

How To Set Readonly File Permissions On Linux / Unix Web Server DocumentRoot

last updated December 29, 2017 in Apache, Lighttpd, Linux, Nginx, UNIX

How do I set a read-only permission for all of my files stored in /var/www/html/ directory?

Could not chdir to home directory /root: No such file or directory Error and Solution

last updated October 25, 2012 in Troubleshooting

When I ssh into my server and login as t root user and I’m getting the following error on screen:

Could not chdir to home directory /root: No such file or directory

How do I fix this error under CentOS or Debian Linux server?