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Full Discussion: Check if a variable has a value assigned?
Top Forums Shell Programming and Scripting Check if a variable has a value assigned? Post 302312841 by sumeet on Sunday 3rd of May 2009 07:36:41 PM
Old 05-03-2009
Check if a variable has a value assigned?
Hi,

I want to check if a variable has a value assigned to it or not.

I can do following -

Code:
cat $Var > File1
if [ -s File1 ]
then
      echo "$Var has value"
else
      echo "$Var is null"
fi

But I have to check for 3 Variables and I want to wrap it up in couple of unix statements.

Any suggestion is appreciated.

Thanks
Sumeet
 

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LEARN ABOUT OPENSOLARIS

tk_strictmotif

Tk_StrictMotif(3TK)					       Tk Library Procedures					       Tk_StrictMotif(3TK)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_StrictMotif - Return value of tk_strictMotif variable

SYNOPSIS

       #include <tk.h>

       int
       Tk_StrictMotif(tkwin)

ARGUMENTS

       Tk_Window   tkwin   (in)      Token for window.
_________________________________________________________________

DESCRIPTION

       This  procedure returns the current value of the tk_strictMotif variable in the interpreter associated with tkwin's application.  The value
       is returned as an integer that is either 0 or 1.  1 means that strict Motif compliance has been requested, so anything that is not part	of
       the Motif specification should be avoided.  0 means that ``Motif-like'' is good enough, and extra features are welcome.

       This  procedure uses a link to the Tcl variable to provide much faster access to the variable's value than could be had by calling Tcl_Get-
       Var.

KEYWORDS

       Motif compliance, tk_strictMotif variable

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTk	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tk is available on http://opensolaris.org.

Tk									4.0						       Tk_StrictMotif(3TK)
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