The following error message:

can be fixed by upgrading the man-db package to version 2.5.3-1 or higher. On Debian (when writing this article) this package is available on SID repository or via sources from oficial website.

If you wish to fix the following errors (on debian google for other distributions)

or
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_CTYPE to default locale: No such file or ...

In order to have a dollar sign at the end of each line in VI / VIM editor, set the following parameter while editing:



Every line will be terminated by a $:

Example:
VIM(1)>-->-->-->-->-->-->-->-->--VIM(1)$
$
$
$
N^HNA^HAM^HME^HE$
vim - Vi IMproved, a programmers text editor$
$
S^HSY^HYN^HNO^HOP^HPS^HSI^HIS^HS$
v^Hvi^Him^Hm [options] [file ..]$
v^Hvi^Him^Hm [options] -$
v^Hvi^Him^Hm [options] -t tag$
v^Hvi^Him^Hm [options] -q [errorfile]$
$
e^Hex^Hx$
v^Hvi^Hie^Hew^Hw$
g^Hgv^Hvi^Him^Hm g^Hgv^Hvi^Hie^Hew^Hw e^Hev^Hvi^Him^Hm e^Hev^Hvi^Hie^Hew^Hw$
r^Hrv^Hvi^Him^Hm r^Hrv^Hvi^Hie^Hew^Hw r^Hrg^Hgv^Hvi^Him^Hm ...

Man zip:

To encode a string into base64, echo and openssl system utilities can be used:


The -n switch to echo is used to supress echoing a new line character. For example, below is a difference between base64 encoded string that doesn't contain newline and on that does:

Fortunately for debugging HTTP connections, there is a very simple way of generating one from command line when elinks or lynx are not available.

For this we need the most basic http command and header: GET/POST and Host.



but the above output is not valid for sending it to a web server. We need some new lines added to it:

# echo ...

Apache 'Invalid command 'Order', perhaps misspelled or defined by a module not included in the server configuration' give the above error message when the "Order" directive is used in it's main or vhosts configuration file(s).

This directive needs the authz_host_module module to be loaded into apache. If you compiled apache with shared modules, then look for the following line in httpd.conf and uncomment it:


Restart apache and the error will be gone.

/service/test/log: unable to open supervise/ok: file does not exist

This daemontools error appears when you've just created a new service (test in my case) to be supervised by svscan and you're trying to start it's logging service. The /service/test/log/supervise/ok and /service/test/log/supervise/control files are pipe files used for inter process communication (IPC). The output from main service (test) is sent via pipe (these files) to it's log service. For some reason, svscan doesn't create them when ...

Vi/Vim editor has a handy option when it comes to editing a file: line numbers. This shows how to turn on and of the display of line numbers in vi or vim editors

Vi / vim has two working modes: Command mode and INSERT mode(-- INSERT --). You can switch between them, using the ESC key. Following commands require you to bee in vi / vim command mode.

While editing a document, type the following ...

Rewriting URLs in Apache is a simple thing if you're skilled in RegEx (Regular Expressions). But there can be cases when URL rewriting doesn't work and you need to debug it.

Apache supports two directives that can come in handful: RewriteLog and RewriteLogLevel.

For best results, place these directives into your Virtual host configuration, not in httpd.conf (general Apache config file) so that you'll get information about rewritten URL's only in from the specific vhost. ...