comment on

I'm working as a root so I should have permission to create any file

That is simply not true. There are a number of possibilities that can prevent even root to write to a file (or create it):

file is readonly
directory if readonly
filesystem is readonly (for example CDROM)
out of filehandles
out of memory
disk full
file system errors that implicitly make the filesystem readonly
file locked by another program
directory locked by another program (most likely kernel during some directory move operations)
file on a network filesystem where you don't have permissions
Some "virtual" files can't be written to (/proc/*)
...The list goes on and on and on to ever more obscure "error" conditions...

BREW /very/strong/coffee HTTP/1.1
Host: goodmorning.example.com

418 I'm a teapot

In reply to Re^3: Problem with switching log files by cavac
in thread Problem with switching log files by ice_ice_ice

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		`&`
	<		`<`
	>		`>`
	[		`[`
	]		`]`

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.