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Top Forums Shell Programming and Scripting ksh Script to Generate Symbolic Links Post 302072906 by dwisconbug on Monday 8th of May 2006 06:37:51 PM
Old 05-08-2006
ksh Script to Generate Symbolic Links

I'm writing a ksh script which will reference a text file I have to create symbolic links for my application:

--file contents--
Link Directory Link Source Link Name
/users/05/dwisconbug bin link2bin


Now, this should create the following link

link2bin -> /users/05/dwisconbug/bin

Before the script creates the symbolic link "link2bin" it needs to see if the link already exists - I know with brute force i can just delete the current link and recreate it, but I want to make sure the current link is pointing to the right source.

How do I use ksh/Unix commands to:

1) "ls -l link2bin" and awk(?) to grab the "link2bin-> /users/05/dwisconbug/bin"

2) If I set the contents of my file to the variables $link_dir, $link_src, and $link_nm generate what I expect the link to look like

3) somehow diff the results from steps #1 and steps #2 to make sure the existing link matches what I have listed in my file?

Any ideas? Thanks in advance!

PS: as you can imagine I need to get this working by the end of the day - so any help is appreciated!
 

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ln(1)							      General Commands Manual							     ln(1)

Name
       ln - link to a file

Syntax
       ln [ -f ] [ -i ] [ -s ] name1 [name2]
       ln [ -f ] [ -i ] [ -s ] name ... directory

Description
       A  link is a directory entry referring to a file.  A file, together with its size and all its protection information may have several links
       to it.  There are two kinds of links: hard links and symbolic links.

       By default makes hard links.  A hard link to a file is indistinguishable from the original directory entry.  Any  changes  to  a  file  are
       effective independent of the name used to reference the file.  Hard links may not span file systems and may not refer to directories.

       Given  one or two arguments, creates a link to an existing file name1.  If name2 is given, the link has that name.  The name2 may also be a
       directory in which to place the link.  Otherwise it is placed in the current directory.	If only the directory is specified,  the  link	is
       made to the last component of name1.

       Given  more  than two arguments, makes links to all the named files in the named directory.  The links made have the same name as the files
       being linked to.

Options
       -f   Forces existing destination pathnames to be removed before linking without prompting for confirmation.

       -i   Write a prompt to standard output requesting information for each link that would overwrite an existing file.  If  the  response  from
	    standard input is affirmative, and if permissions allow, the link is done. The -i option has this effect even if the standard input is
	    not a terminal.

       -s   Creates a symbolic link.

	    A symbolic link contains the name of the file to which it is linked.  The referenced file is used when an operation  is  performed	on
	    the  link.	 A  on a symbolic link returns the linked-to file.  An must be done to obtain information about the link.  The call may be
	    used to read the contents of a symbolic link.  Symbolic links may span file systems and may refer to directories.

See Also
       cp(1), mv(1), rm(1), link(2), readlink(2), stat(2), symlink(2)

																	     ln(1)
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