Can not test many arguments Post: 90097

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Top Forums Shell Programming and Scripting Can not test many arguments Post 90097 by vino on Friday 18th of November 2005 07:12:55 AM

11-18-2005

Registered User

You might want to check the man pages. See the following in bold.
From man ksh

Code:

       [[ expression ]]
              Similar to the test and [ ... ] commands (described later), with
              the following exceptions:
                �    Field splitting and file name  generation  are  not  per-
                     formed on arguments.
                �    The  -a  (and) and -o (or) operators are replaced with &&
                     and ||, respectively.
                �    Operators (e.g., -f, =, !, etc.) must be unquoted.
                �    The second operand of != and = expressions  are  patterns
                     (e.g., the comparison in
                                        [[ foobar = f*r ]]
                     succeeds).
                �    There  are two additional binary operators: < and > which
                     return true if their first string operand is  less  than,
                     or  greater  than,  their  second string operand, respec-
                     tively.
                �    The single argument form of  test,  which  tests  if  the
                     argument  has  non-zero  length,  is not valid - explicit
                     operators must be always be used, e.g., instead of
                                              [ str ]
                     use
                                           [[ -n str ]]
                �    Parameter, command and arithmetic substitutions are  per-
                     formed  as  expressions are evaluated and lazy expression
                     evaluation is used for the &&  and  ||  operators.   This
                     means that in the statement
                                  [[ -r foo && $(< foo) = b*r ]]
                     the  $(<  foo)  is  evaluated if and only if the file foo
                     exists and is readable.

vino

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let

let(1)								   User Commands							    let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

   ksh93
       let [expr...]

DESCRIPTION

   ksh
       Each arg is a separate arithmetic expression to be evaluated.

   ksh93
       let  evaluates  each expr in the current shell environment as an arithmetic expression using ANSI C syntax. Variables names are shell vari-
       ables and they are recursively evaluated as arithmetic expressions to get numerical values. let has been made obsolete by the ((...))  syn-
       tax of ksh93(1) which does not require quoting of the operators to pass them as command arguments.

EXIT STATUS

   ksh
       ksh returns the following exit values:

       0    The value of the last expression is non-zero.

       1    The value of the last expression is zero.

   ksh93
       ksh93 returns the following exit values:

       0     The last expr evaluates to a non-zero value.

       >0    The last expr evaluates to 0 or an error occurred.

ATTRIBUTES

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

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

SEE ALSO

       ksh(1), ksh93(1), set(1), typeset(1), attributes(5)

SunOS 5.11							    2 Nov 2007								    let(1)