Monthly Archives: August 2011

Linux – Terminal system info, cheat sheet

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This is a small collection of commands that can give you information on a Linux computer.
Most of this commands can be run as non-privileged user, but more information can be obtained if (and should be) run as root:

General system information:

# uname -a

List all hardware

lshw |less

Alternative with Gtk frontend
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Linux – How to create and remove a soft link, symlink or symbolic link

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A soft link, or more common, a symlink, is link a shortcut to the targeted file or directory. So when is removed the original target stays present. This is the opposite of a hard link which is a reference to the target and so, if the hard link is removed, so is the target.

A symlink can be created like:

ln -s /path/ linkname

from the ln man pages:

ln [OPTION]… [-T] TARGET LINK_NAME (1st form)

-s, –symbolic
make symbolic links instead of hard links

To remove a symlink

rm linkname

What is important here is to note that the command doesn’t have the trailing slash:


$ rm linkname/
will output the error:
rm: cannot remove `linkname/': Is a directory

$ rmdir linkname/
will output:
rmdir: linkname/: Not a directory

 

HTML – Prevent js and css files from being cached

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By default, external files such as javascript and css are cached by the browser. If you want to prevent this from caching, simply use this easy tip:

<link href="/stylesheet.css?<?php echo time(); ?>" rel="stylesheet" type="text/css" />

The result will look like this:

<link href="/stylesheet.css?1334567890" rel="stylesheet" type="text/css" />