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HP OpenVMS Systemsask the wizard |
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The Question is: How can I make DCL DIFFERENCE output only statistics (just like DCL SEARCH /WIN=0 or DCL DIR /NOHEAD/NOTRAIL) and not also the actual differences? (We are using a commandprocedure which attempts to fill the void left by DIFF not supporting wildcards by invoking DIFF for each file returned by F$SEARCH(). Whenever DIFF encounters a non-ascii file - like an executable - then the output of DIFF tends to change the terminal settings because the terminal interprets the DIFF output as control characters - I think. Just knowing that differences exist would suffice for us with these files. Is it correct to test for whether a file is an ASCII file or not usin g the following expression f$file(file,"RFM") .eqs. "FIX" .or. f$file(file,"RAT") .eqs. "RAT"? Thank you very much. The Answer is : One option is to check the status returned from the DIFFERENCES command, like this: $ DIFFER/OUTPUT=NL: file1.ext file2.ext $ IF $STATUS .EQ. %X006C8009 THEN $ GOTO NO_DIFFERENCE or $ IF $STATUS .EQ. %X006C8013 THEN $ GOTO THERE_IS_A_DIFFERENECE A little experimentation with different combinations of input files and the resulting $STATUS values should enable you do do what you want. (Note: the /NOOUTPUT qualifier does not supress output from DIFFERENCES! That's why you have to use /OUTPUT=NL:)
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