FAQ for the 'Linux' Category

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Explain: #!/bin/bash - or #!/bin/bash -- In A Shell Script

Q. I know #!/bin/bash is shebang line. But, I noticed a few shell script shebang line ends with a single dash ( #!/bin/bash - ) or double dash ( #!/bin/bash – ). Can you explains me purpose of such shebang line?
How To Select Best Linux Desktop Application

Q. I’m new to GNU/Linux world and a single query (apt-cache search office or yum search ‘office’) shows so many application for a single task such as network monitoring or office applications. The number of apps choices just confusing. How do you select application from so many choices?
How To Find Files by Content Under UNIX

Q. I had written lots of code in C for my school work and saved it as source code under /home/user/c/*.c and *.h. How do I find files by content such as string or words (function name such as main() under UNIX shell prompt?
Linux / UNIX: Change Crontab Email Settings ( MAILTO )

Q. I’d like to send email to user@example.com instead of default root user. How do I change email settings under crontab file?
Q. I’d like to send email to user@example.com instead of default root user. How do I change email settings under crontab file?
PHP: Verify And Sanitize Email Address

Q. How do I verify input data such as email address under PHP programming language?
Shell: How To Remove Duplicate Text Lines

Q. I need to sort data from a log file but there are too many duplicate lines. How do I remove all duplicate lines from a text file under GNU/Linux?
Apache Error Client Denied By Server Configuration

Q. I’m running Apache 2 Web sever under CentOS Linux and getting an error that read as follows:

[Wed Sep 17 21:53:49 2008] [error] [client 122.1xx.y9.zzz] client denied by server configuration: /var/www/examples.com/

How do I fix this error?
Linux X11 Connection Rejected Because of Wrong Authentication Error and Solution

Q. I’m trying to login to my remote Ubuntu Linux server from Mac OS X desktop using following command:
ssh -X user@vpn.officeserver.example.com xeyes

But I’m getting an error that read as follows:

X11 connection rejected because of wrong authentication.

How do I fix this error?
Linux / UNIX Shell: Sort IP Address

Q. I’d like to sort a list of IP address stored in a text file. How do I sort by last notation or entire address under Linux or UNIX operating systems?
CentOS / Red Hat Linux Install PHP 5.x PECL Filter Extension

Q. How do I install filter extension for safely dealing with input parameters supplied via a web form using filter_var()?