Adding an escape character (e.g. rm -rf \-filename) or quoting the file name (e.g. rm -rf “-filename”) will not do the job.

The solution is simple: explicitly provide the full or relative path to the file. e.g.:

rm -rf /path/to/-file

or the following – if for instance your current working directory is the one containing the file in question

rm -rf ./-file…

Example 1:

find /path/to/folder -type f -name “*.txt” -mtime -5

This will find ‘files’ (-type f) within the folder /path/to/folder (or one of its sub directories), whose name ends with ‘.txt’, and which were modified (mtime) less than 5 days ago

Example 2:

find /path/to/folder -type d -name “stat*” -mtime +10

This would find ‘directories’ (-type d) within the folder /path/to/folder (or one of its subdirectories), whose name …

So, to keep it short and simple: assume you’d like to forward any traffic coming to your machine (192.168.0.1) on port 80 to machine2 (192.168.0.2) on port 8080 then:

- Enable port forwarding:

echo 1 > /proc/sys/net/ipv4/ip_forward

- Now add the rules:

iptables -t nat -A PREROUTING -p tcp -d 192.168.0.1 –dport 80 -j DNAT –to 192.168.0.2:8080

iptables -t nat -A POSTROUTING -d 192.168.0.2 -j MASQUERADE

The -p tcp flag specifies that the protocol is TCP (as opposed to UDP, ICMP for example).

The -d 192.168.0.1 flag specifies that the …

In some cases, clients that use a version prior to 4.1 will have a problem authenticating against the MySQL database if the latter has a post 4.1 version.

The trick is that after 4.1 (i.e. 4.11 and up), MySQL changed the way it stores the passwords in the user table inside the mysql system database.
Password hashes are now 41 bytes long instead of the old 16 bytes.

So for example, if your MySQL server is 5.0, while your php-mysql library is 4.1, your web …

This usually happens when you edit a file using certain windows-editors, then transfer it to your *nix machine.
Luckily, it is easily to get rid of this control character. While in vi, execute the following command:

:1,$s/^M//g

Important note: do not manually type a caret then the capital M character. Actually, in order to type ^M, press CTRL+V followed by CTRL+M.

A quick note:  the above command will look for the ^M character …

There is an easy way to do so with the help of the vi editor.

This example will illustrate the power of vi:

Suppose you have 100 .html files, and you want to replace the occurence of the string ’2007′ with ’2008′.

As such, execute the following at your prompt:

vi *.html

This will open all the files ending with ‘.html’ in your current working directory. Then issue the following command:

:argdo %s/2007/2008/g | wq

That’s it! the above command will loop over each file, replacing (%) …

Any file or folder has a permission associated to it. Look at it as: ‘who has the power over this file/folder, and what kind of power does he have’.

There are 3 types of permissions:

• read
• write
• execute

These permissions apply to 3 groups of people:

• The file/folder owner
• The group to which the owner of this file/folder belongs
• The rest of the crowd, called world.

So suppose you have a file ‘x’, then …

What if the main server is not running windows? Some prefer to opt for linux, and run several services that benefit client computers on this network (such as dns, dhcp, samba, NIS, etc…)

The good news for linux users is that they can benefit from the same functionality of ICS, but using linux iptables.

The following is a sample rule:

/sbin/iptables -t nat -A POSTROUTING -o …