Ans:

The UNIX command 'ldd' lists dynamic dependencies of executables or shared objects. Basically, it is used to list what shared libraries an executable depends on. When an executable is launched, it expects to load certain shared libraries
(similar to Windows DLLs)
It uses the environment variable LD_LIBRARY_PATH to find these shared libraries.
LD_LIBRARY_PATH contains a list of directories, each of which will be searched. (similar to the PATH variable)
ldd will display all the shared libraries the executable needs, and where the library was found.
Here is an example:
$ ldd adaimgr
libsocket.so.1 => /usr/lib/libsocket.so.1
libnsl.so.1 => /usr/lib/libnsl.so.1
libm.so.1 => /usr/lib/libm.so.1
libdl.so.1 => /usr/lib/libdl.so.1
libposix4.so.1 => /usr/lib/libposix4.so.1
libsunmath.so.1 => /u16/oracle7/product/7.3.3/lib/libsunmath.so.1
libc.so.1 => /usr/lib/libc.so.1
libucb.so.1 => /usr/ucblib/libucb.so.1
libresolv.so.2 => /usr/lib/libresolv.so.2
libelf.so.1 => /usr/lib/libelf.so.1
libintl.so.1 => /usr/lib/libintl.so.1
libmp.so.1 => /usr/lib/libmp.so.1
libw.so.1 => /usr/lib/libw.so.1

This lists all the libraries adaimgr expects to load, and where they are located.
Using ldd -s will also show the search path ldd used to find the libraries
Using ldd -v will list a more verbose output
See the ldd man pages for more information.
(See frhp10.fr.oracle.com/ports.html for the command to use on platforms other than Solaris)

Ans: Add a fourth digit to the 'chmod' command
For example, to set permissions to 755 you would normally use: chmod 755
To set the setuid bit, add a 4 before the 755, like: chmod 4755
To set the setgid bit, use: chmod 2755
To set them both, use chmod 6755
Or, use the symbolic method like chmod u+s/chmod u-s (to set/unset the setuid bit)
chmod g+s/chmod g-s (to set/unset the setgid bit)
(Remember, the oracle executable must have the setuid bit set or no other users besides oracle will be able to connect to the database)

1.     How do I remove a file that begins with a hyphen? (Like -filename)?

Ans: rm will normally complain about an invalid option if you say: rm -filename
Most UNIX commands will behave this way, treating the characters after the hyphen
as an option.
Rm has an option to say 'end of options, the next parameter is a filename'
The option is '--' (double hyphen)
So you can use: rm -- -filename
Most UNIX commands have a -- option like this to signify end of options.

 My Escape key does not work in VI? Help!

Ans: Go to your NCD boot server machine (orlsun1, 2, 10, or 11)

There should be a file called 'xh' in your home directory.
Add these two lines to the file:
/usr/open win/bin/xmodmap -e 'keycode 9 = grave asciitilde' &
/usr/open win/bin/xmodmap -e 'keycode 14 = Escape' &
Reboot your NCD.
Now, the ~ key (at the top left of the keyboard) is now the Escape key.
The ~ and ` are on the key between the Shift key and Z.

(Control-[also works as Escape)

Ans: A link is a pointer or reference to another file. A directory in UNIX has a list of file names and their corresponding inodes. A directory entry can have an Inode pointing to another file.

This is a hard link. When a hard link is made, then the i-numbers of two different directory file entries point to the same inode.

A symbolic link or a soft link is a special type of file containing links or references to another file or directory in the form of a path. The path may be relative or absolute. To create a symbolic link, following command is used:

Ln –s target link_name
Here, target is the path and link_name is the name of the link. Symbolic links can be created to create a file system based on different views of the user.