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In fact, at the moment, most hydrogen is produced using a process known as steam reforming. This takes fossil fuels and combines them with steam, which disassociates the hydrogen from the carbon, However, do not be fooled! This process still leaves a whole lot of carbon dioxide to be gotten rid of. At the moment, there is talk of a technology called sequestration. Sequestration involves separating the carbon dioxide emissions from industry or an item of plant. They are then piped to a facility where they can be forced underground into natural geological features which supposedly will keep the carbon locked up under the earth s surface. Put simply, this technique involves hiding the problem by burying it underground. It is a good technology in so far as it allows the oil companies to maintain the status quo by continually producing oil. However, the carbon dioxide is still present albeit sequestered underground. There is also another incentive for companies to adopt sequestration it increases their oil production! By forcing gas underground, more oil comes to the surface. Economically it makes good sense, environmentally the case is yet to be proven. No one has yet tried sequestration on the scale proposed before it is unknown whether this gas will find ways of escaping back to the atmosphere. One method proposed for making hydrogen using solar energy, is to use bacteria to produce it. Using a process of photosynthesis, certain algae and bacteria have been shown to produce hydrogen gas. This hydrogen can be harnessed and used to power the hydrogen economy.

bash-2.03$ touch lastminute.txt bash-2.03$ ls -l total 4 -rw-r--r-1 root root -rw------1 root root -rwxrwxrwx 1 root users

The new file has full access permissions for the owner, but no access permissions for other users. Resetting the umask does not affect the permissions of other files that have already been created.

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The file permissions we ve covered so far are used by users in their day-to-day filemanagement strategies. However, administrators can use a different set of file permissions that allows files to be executed as a particular user (setUID) and/or as a member of a particular group (setGID). These facilities are very powerful, because they allow unprivileged users to gain access to limited superuser privileges in many cases, without requiring superuser authentication. For example, the volume daemon (vold) allows unprivileged users logged into the console to mount and unmount CD-ROMs and floppy disks, an operation that required superuser privileges in previous Solaris releases. Here, the effective user ID is set to 0, meaning that unprivileged users can effectively run processes as root. The downside to this is obvious: setGID and setUID permissions open a Pandora s box in terms of security, because normal authentication procedures are bypassed. For example, imagine a device management tool that needed to run as setUID 0 in order to read and write device files. If the tool had a standard feature of many UNIX programs, the ability to spawn a shell, the shell spawned would have full root privileges, rather than the privileges of the original user. For this reason, some administrators refuse to

Part III:

allow setGID and setUID permissions to be set. The find command, for example, can be used to scan all local file systems and show files with setUID or setGID privileges:

You can determine whether a file is setUID by root by first checking for files that are owned by root and then checking whether those files have the s flag assigned to the user s permissions. For example, if a file-management tool called filetool were setUID root, the following directory listing would clearly indicate this property:

The chemical symbol for water is H2O. Those with even a smattering of knowledge of chemistry will know that this means a water molecule is comprised of two hydrogen atoms and one oxygen atom. When we pass an electrical current through the water, using the reversible fuel cell as our electrolyzer, we are splitting the water into its constituent parts hydrogen and oxygen. Because of the membrane inside the fuel cell, the hydrogen and oxygen are kept separated. The hydrogen and oxygen can then be piped off, and stored in tanks, where the hydrogen and oxygen can be saved for later use.

The first s in the permissions table refers to setUID root. In addition, this file is also setGID for the sys group, which is indicated by the second s in the permissions table. The setUID bit can be set by using a command like this

where file.txt is the file that requires setUID to be set. The setGID bit can be set by using a command like this

where file.txt is the file that requires setGID to be set. Setting chmod o+s has no impact on the file.

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