Novice Linux / Unix System Administrator Tutorials

These tutorials assumes that you have basic understanding of Unix like operating systems and you are familiar with – Unix/Linux and its commands at the user level, know how to edit files, familiar with the Bourne shell/Bash/Ksh shell, know how to perform standard file processing tasks (such as find/move/copy/delete/) and so on. ( rss feed )

VIM: Jump Back To Previous or Last Cursor Position

by on April 14, 2013 · 0 comments

Writing shell scripts in vim I usually go search for functions or something. Copy lines and then go back to where I was and modify the code. However, I need to manually navigate way back to the previous / last position. How can I automatically go back to where I was when I started my search operation under vim?

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AWK: Remove All Blank Spaces From String / Field

by on April 14, 2013 · 6 comments

I need to parse the following text file:

# example.net config
user = www30021
group = ftp30020
uid = 30021
gid = 30020
tmp_path = /netapp42/shared/www/images/host.example.com/tmp.bin
tmp_perms = defaults,nodev,nosuid,noexec
jail = on
location = /jails/apache/h/host.example.com/
sftp = on
ftps = off
php-cgi = on
perl-cgi = off
I need to find out value for each field and remove any blank spaces / white spaces from the field. How do I solve this problem using awk under Linux or Unix like operating systems?

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Linux: Start / Stop / Restart Apparmor

by on April 9, 2013 · 0 comments

AppArmor is a Linux Security Module (LSM) implementation of name-based mandatory access controls (MAC). How do I start / stop / restart AppArmor under Ubuntu Linux or OpenSuse / Suse Enterprise Linux server systems running on IBM hardware?

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

by on April 9, 2013 · 0 comments

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?

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Linux / Unix Shell Script: Get The Current Directory

by on April 9, 2013 · 0 comments

I am working on a shell script. I need to find out the current working directory. How do I get the current working directory under Bash or Ksh shell running on Linux or Unix like operating systems?

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FreeBSD: Delete User Account Command

by on April 9, 2013 · 1 comment

How do I remove the tom user under FreeBSD operating system using command line options?

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Linux: Jpeg Image Optimization / Compress Command

by on April 9, 2013 · 2 comments

I know how to optimize and compress png images using optipng command. line tool. I have lots of images in JPEG format. How do I compress and optimize JPEG images on my amazon cloud account so that I can save bandwidth on cloudfront cdn account? How do I use an image compressor to create lossless compression on JPEG files, with no effect on image quality in bulk using Linux?

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