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Top Forums Shell Programming and Scripting complex if statement syntax without using 'if ..' keyword in ksh. Post 302504839 by kchinnam on Tuesday 15th of March 2011 02:51:28 PM
Old 03-15-2011
Thaks hergp, that is what I am looking for.. I was wondering what makes my code fail, now I found answer for it.

Short-cut syntax for 'if' construct is really very un-safe and does not replace standard structure. God forbid a un-expected issue makes your last statement in if condition fail, it would cause control go into else part. If its doing a critical work in Production, you will go nuts as to what hit this logic :-)!

Does any one dispute my conclusions? If not stop using short-cut 'if' construct in business critical programs..
 

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gethead(1)						      General Commands Manual							gethead(1)

Name
       gethead - Print FITS or IRAF header keyword values

Synopsis
       gethead [-hptv] [-d pathname] [-n num] <FITS or IRAF file> kw1 kw2 ... kwn

Description
       Print  values of the specified keywords from the given image header.  By default they are all listed on one line, separated by spaces.  The
       -v flag causes the keyword names and values to be printed, one keyword per line.  To read keywords from a list of files, substitute @<list-
       file>  for  the file names on the command line.	To read a lot of keywords, put them, one per line, in a file and substitute @<keylistfile>
       on the command line.  If two @ commands are present, the program will figure out which contains file names and which contains keywords.

Options
       -a     List file name even if keywords are not found

       -d     Root directory for input files (default is cwd)

       -e     Output keyword=value's on one line per file

       -f     Never print filenames (default is to print them if more than one)

       -g     Output keyword=value's on one line per keyword

       -h     flag causes the keyword names to be printed at top of columns.

       -n     Number of decimal places in numeric output

       -o     OR conditions instead of ANDing them

       -p     Print full pathnames of files

       -t     flag causes the output to be in tab-separated tables with keyword column headings.

       -u     Always print ___ if keyword not found, event if only one keyword in search

       -v     Print output as <keyword>=<value>, one per line

Web Page
       http://tdc-www.harvard.edu/software/wcstools/gethead.html

Author
       Doug Mink, SAO (dmink@cfa.harvard.edu)

6 July 2001							     WCSTools								gethead(1)
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