FAQ

I am a new Linux command line user. How do I start or run command in the background so that I can access command prompt immediately?

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I have a data as follows :

foo bar 12,300.50
foo bar 2,300.50
abc xyz 1,22,300.50

How do I replace all , from 3rd field using awk and pass output to bc -l in the following format to get sum of all numbers:
12300.50+2300.50+1,22,300.50

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How do I send a header to my Web server (such as Nginx / Lighttpd / Apache / ISS) on a Apple OS X or Unix or Linux based system using a curl command line option for testing and debugging my web apps or server nodes behind a load balancer?

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I have turned on gzip compression as modern web browser supports and accepts compressed data transfer. However, I’m unable to do so with the wget command. How do I force wget to download file using gzip encoding?

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I‘m currently using Amazon EBS block level storage volumes for use with Amazon EC2 instances powered by Red Hat Enterprise Linux. This volume stores critical webapp and user data. We are moving out to another cloud provider. How do I find files such as *.logs, *.php, *.gz and few other file patterns and securely delete them so that no one can recover it ever?

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How do I find out my DNS server IP address assiged my my ISP under Unix or Linux operating system using command prompt? How do I find preferred dns server under Debian / Ubuntu / Fedora Linux desktop system?

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I‘m trying to install latest version of Hewlett-Packard’s Linux Imaging and Printing software (HPLIP) for my office jet printer. In order to install latest version of HPLIP I removed the hplip-gui, hplip, hplip-cups, hplip-data, hpijs, and hpijs-ppds Debian Linux packages However, I’m getting the following error:

Debian warning: CUPSEXT could not be loaded. Please check HPLIP installation.



How do I fix this error while installing hplip-3.12.9.run under Debian Linux 6.0.5 amd64 bit?

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