ksh hidden characters in variables Post: 303007611

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Top Forums Shell Programming and Scripting ksh hidden characters in variables Post 303007611 by user052009 on Saturday 18th of November 2017 09:21:04 PM

11-18-2017

Registered User

It's caused when the first character in the options field is a dash. I'm calling the script from the command line. The script was edited using vi. Here's the full output with debug when I use '-options -debug':

Code:

./test.ksh -username user1 -surname user2 -address abc123 -startdate 123 -req 4 -options –debug 
+ print 'INFO - Process arguments ...'
INFO - Process arguments ...
+ [ -n -username ]
+ grep -e '^-[a-z]'
+ echo user1
+ [ '' ]
+ shift
+ SourceTarget=user1
+ shift
+ [ -n -surname ]
+ grep -e '^-[a-z]'
+ echo user2
+ [ '' ]
+ shift
+ DestTarget=user2
+ shift
+ [ -n -address ]
+ grep -e '^-[a-z]'
+ echo abc123
+ [ '' ]
+ shift
+ ADDRESS=abc123
+ shift
+ [ -n -startdate ]
+ grep -e '^-[a-z]'
+ echo 123
+ [ '' ]
+ shift
+ STARTDATE=123
+ UNTIL=123
+ shift
+ [ -n -req ]
+ grep -e '^-[a-z]'
+ echo 4
+ [ '' ]
+ shift
+ REQ=4
+ shift
+ [ -n -options ]
+ [ -n $'\u[2013]debug' ]
+ shift
+ OPT=$'\u[2013]debug'
+ break
+ print 'INFO - Processed inputted arguments...'
INFO - Processed inputted arguments...
+ STR=$'\u[2013]debug'
+ print $'STR Options field: \u[2013]debug'
STR Options field: –debug
+ exit 0

And now if I run the same command but remove the dash from before 'debug' in the options field:

Code:

./test.ksh -username user1 -surname user2 -address abc123 -startdate 123 -req 4 -options debug 
+ print 'INFO - Process arguments ...'
INFO - Process arguments ...
+ [ -n -username ]
+ grep -e '^-[a-z]'
+ echo user1
+ [ '' ]
+ shift
+ SourceTarget=user1
+ shift
+ [ -n -surname ]
+ grep -e '^-[a-z]'
+ echo user2
+ [ '' ]
+ shift
+ DestTarget=user2
+ shift
+ [ -n -address ]
+ grep -e '^-[a-z]'
+ echo abc123
+ [ '' ]
+ shift
+ ADDRESS=abc123
+ shift
+ [ -n -startdate ]
+ grep -e '^-[a-z]'
+ echo 123
+ [ '' ]
+ shift
+ STARTDATE=123
+ UNTIL=123
+ shift
+ [ -n -req ]
+ grep -e '^-[a-z]'
+ echo 4
+ [ '' ]
+ shift
+ REQ=4
+ shift
+ [ -n -options ]
+ [ -n debug ]
+ shift
+ OPT=debug
+ break
+ print 'INFO - Processed inputted arguments...'
INFO - Processed inputted arguments...
+ STR=debug
+ print 'STR Options field: debug'
STR Options field: debug
+ exit 0

Last edited by user052009; 11-18-2017 at 10:27 PM..

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LEARN ABOUT SUNOS

shift

shift(1)							   User Commands							  shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
	   able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
	   performed.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10							    15 Apr 1994 							  shift(1)