Unix

Assuming you had a file called 'file' in the current working directory it would try to guess what type of file it is, based on its contents.

A shell program is called a command processor because it has to process commands according to what the user wishes to do. Along with executing commands as specified by the user it also has its own programming language and can be instructed to do things programmatically.

There is one general command for the UNIX (actual UNIX not Linux) which will yield which port is being used by what service: lsof -i

For Linux it is: netstat

For more information for either command, please see these sources:

lsof http://www-uxsup.csx.cam.ac.UK/security/lsof.HTML

netstat http://www-uxsup.csx.cam.ac.UK/security/netstat.HTML

Additional :

'netstat' is a standard tcp/ip utility, so it will work on all platforms using tcp/ip, including windows.

You use the 'chown' command. You must be the owner of the file to do this or the super-user to change ownership.

Not sure what you mean by enter a file; you could use an editor, such as vi, emacs, nano, pine, etc. to edit it.

an extensioin of indexed allocation

A zombie (or defunct) process is one that has ended but for whatever reason the process information has not been removed from the process table. No code or data segments are allocated to the process anymore but the system has not removed it from the process list, so it appears to be still in the system (but isn't because it doesn't have any resources).

In the past the only way to get rid of zombie processes was to reboot the system to restore the system proc table. It is possible to try and get a parent process to execute a 'wait' system call to try and remove it - see related links.

An internal command is one that is built in to the shell interpreter and is likely to be used quite a bit.

An external command is a file in a directory that can be searched, loaded, and executed.

The reason for having internal commands is for performance; it takes a lot less time to have the shell just execute the given internal command than it would take to find it on the system, load it into memory, and then execute it.

AIX is the commercial Unix product produced by IBM. Since it is a server system, you could use it for anything that would require server services, such as Internet services, web services, e-mail services, file services, etc.

AIX in a server mode is no different than other servers in terms of offering resources to be used by other clients.

Solaris 9 is no longer available for purchase or download from Sun Microssystems. You may be able to purchase a used license from other online retailers or on eBay.

DSGET

wc -l filename It will return no of lines in the provided file. wc stands for word count.

The 'ps' command without arguments will give a summary of those processes running in the current environment.

len=0

i=1

echo -n "Enter a String: "

read str

len=`echo $str | wc -c`

len=`expr $len - 1`

halfLen=`expr $len / 2`

while [ $i -le $halfLen ]

do

c1=`echo $str|cut -c$i`

c2=`echo $str|cut -c$len`

if [ $c1 != $c2 ] ; then

echo "string is not palindrome"

exit

fi

i=`expr $i + 1`

len=`expr $len - 1`

done

echo "String is Palindrome"

Linux is far more common these days than traditional Unix. But as any old system administrator will tell you, learn to learn, don't learn the system. There are numerous differences between the different Linux distros, differences between Linux and Unix, and differences between each of the Unices. Learning everything about each system is a daunting task, and probably near impossible. Rather than, say, learning all of the different command line switches for "ls" on each system, just know how to access a man page.

FAT32 is used in Inodes

Hard to say this is a true or false statement; the C language is the same on both platforms; only the API/System calls vary. Since they do similar things it would be almost impossible to say one system is more powerful than another in terms of a programming language that is common to both.

No files are actually "invisible." However, certain files may not be displayed by default as a convenience to the user. These are setting / configuration files for programs in the user's directory.

One could go read the Southern Daily Echo on their website at Daily Echo. It is owned by one of the biggest publishing companies in the United Kingdom.

The usual approach is to create a 'tar' file first of the directory and then compress the tar file. This is also safer because it leaves the original directory intact.

Solaris is a UNIX operating system developed by Sun Microsystems.