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Full Discussion: Null Character Handling
Top Forums Shell Programming and Scripting Null Character Handling Post 302138030 by npk2210 on Friday 28th of September 2007 09:48:37 AM
Old 09-28-2007
Null Character Handling
Hi All,

I have a problem with Null values while reading line by line from a text file. I wrote a shell script to read set of file names from a text file line by line, and zipping the each individual file and copying those zip files into some separate directory, and removing the original file from current directory. My shell script is as follows

#!/usr/bin/ksh
cat OCloader_gdlfiles/loaded_gdl_archive_file_list.txt | while read LINE
do
zip OCloader_archive/gdl_loaded/$LINE.zip OCloader_gdlfiles/$LINE
rm OCloader_gdlfiles/$LINE
done


Note:- Here OCloader_gdlfiles is a soft link to some other directory in unix box.

Now my problem was, Suppose while reading the lines from the text file, if any null input is assigned to the LINE variable then the rm command is as follows

rm OCloader_gdlfiles/NULL

then the corresponding soft link is removing from the unix box. To avoid this how should i change my code. I don't have any idea to do this. Your help will be appriciated.
 

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LEARN ABOUT HPUX

show_link

show link(1m)															     show link(1m)

NAME

       show link - Displays attribute information about the specified soft link

SYNOPSIS

       cdscp show link link-name [attribute-name] [with attribute-name = attribute-value]

ARGUMENTS

       The  full  name	of  a  specific soft link.  The last simple name can contain wildcard characters.  The name of a particular attribute; see
       Description for valid attribute names.  The value of a particular attribute.

DESCRIPTION

       The show link command displays the names and values of the attributes specified in attribute-name.  You can use a combination of attributes
       in  any	sequence  in  a  single command. Use a space to separate multiple attributes.  You can use a with attribute-name = attribute-value
       clause to limit output only to soft links whose attributes have values equal to the specified values.  A space must precede and follow  the
       = (equals sign).  If you do not supply any attributes, the command displays all attributes and their values. The following is a description
       of soft link attributes: Specifies the creation timestamp (CTS) of this soft link Specifies the full name of the directory,  object  entry,
       or other soft link to which the soft link points Specifies a timeout value after which the soft link is either checked or deleted Specifies
       the timestamp of the most recent update to an attribute of the soft link

   Privilege Required
       You must have read permission to the soft link.	If you specify a wildcard soft link name, you also need read permission to  the  directory
       that stores the soft link.

NOTE

       This command is replaced at Revision 1.1 by the dcecp command and may not be provided in future releases of DCE.

EXAMPLE

       The  following command displays the current values of all the attributes associated with the soft link /.:/sales/region1.  cdscp> show link
       /.:/sales/region1

			       SHOW
			   SOFTLINK   /.../abc.com/sales/region1
				 AT   1991-10-15-15:54:40
			    CDS_CTS = 1991-10-15-19:54:35.00000003/08-00-2b-1c-8f-1f
			    CDS_UTS = 1991-10-15-19:54:35.00000006/08-00-2b-1c-8f-1f
		     CDS_LinkTarget = /.../abc.com/sales/service

			       SHOW
			   SOFTLINK   /.../abc.com/sales/region1
				 AT   1991-10-15-15:54:41
			    CDS_CTS = 1991-10-15-19:54:36.00000077/08-00-2b-1c-8f-1f
			    CDS_UTS = 1991-10-15-19:54:36.00000009/08-00-2b-1c-8f-1f
		     CDS_LinkTarget = /.../abc.com/sales/software
		    CDS_LinkTimeout = :
			 Expiration = 1991-10-15-00:00:00.0
			  Extension = +1-00:00:00.000

RELATED INFORMATION

       Commands: create link(1m), delete link(1m), list link(1m), remove link(1m), set link(1m)

																     show link(1m)
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