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Top Forums Shell Programming and Scripting How to check if export DISPLAY is set or not? Post 302373394 by smarty86 on Friday 20th of November 2009 06:49:12 AM
Old 11-20-2009
How to check if export DISPLAY is set or not?

Hi All,


I use "export DISPLAY=same_host:0.0" to set my export DISPLAY and it is working fine for me..


Problem here is I have developed a script for which i should run export DISPLAY prior to running my script....

so my script should check whether export DISPLAY is set or not.. if set then it should continue else it should give error.. Please Help me
 

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EXPORT(3PVM)															      EXPORT(3PVM)

NAME
pvm_export, pvm_unexport - Mark environment variables to export through spawn SYNOPSIS
C int cc = pvm_export( char *name ) int cc = pvm_unexport( char *name ) Fortran Not available PARAMETERS
name Name of an environment variable to add to or delete from export list. DESCRIPTION
The routines pvm_export and pvm_unexport are provided for convenience in editing environment variable PVM_EXPORT, while maintaining the colon-separated list syntax it requires. The variable can be modified by other means, and at the same time by the pvm_export functions. pvm_export checks to see if a name is already in PVM_EXPORT before including it, and exporting a name more than once is not considered an error. Likewise, pvm_unexport will not complain if you specify a name not in PVM_EXPORT. EXAMPLES
C: /* PVM_EXPORT=SHELL:HOME */ pvm_export("DISPLAY"); pvm_export("TERM"); pvm_unexport("HOME"); /* PVM_EXPORT=SHELL:DISPLAY:TERM */ ERRORS
No error conditions are currently returned by pvm_export and pvm_unexport. SEE ALSO
pvm(1PVM) pvm_spawn(3PVM) 15 May, 1996 EXPORT(3PVM)
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