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Full Discussion: multiple conditions in if statements
Top Forums Shell Programming and Scripting multiple conditions in if statements Post 20513 by Jimbo on Sunday 28th of April 2002 09:42:39 AM
Old 04-28-2002
On assignments to a variable, do x= instead of $x= .

When you use a mixture of -o and -a, you might have to control precedence. In the following, the first line would test true because -o has precedence:
if [ a = a -o b = b -a c = C ]
But add parentheses (you would need to backslash these) and it would now test false:
if [ ( a = a -o b = b ) -a c = C ]

Also, when checking for several values, a case statement makes for nice clean code, and even more handy when each value will result in a different action:
Code:
case $x in
 +|-|/|%) x=$vr1;;
       *) print "You have entered an invalid option."
          exit 1;;
esac

Jimbo
 

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LEARN ABOUT SUSE

execute

EXECUTE(7)							   SQL Commands 							EXECUTE(7)

NAME

       EXECUTE - execute a prepared statement

SYNOPSIS

       EXECUTE name [ ( parameter [, ...] ) ]

DESCRIPTION

       EXECUTE	is  used  to execute a previously prepared statement. Since prepared statements only exist for the duration of a session, the pre-
       pared statement must have been created by a PREPARE statement executed earlier in the current session.

       If the PREPARE statement that created the statement specified some parameters, a compatible set of parameters must be passed to the EXECUTE
       statement,  or  else an error is raised. Note that (unlike functions) prepared statements are not overloaded based on the type or number of
       their parameters; the name of a prepared statement must be unique within a database session.

       For more information on the creation and usage of prepared statements, see PREPARE [prepare(7)].

PARAMETERS

       name   The name of the prepared statement to execute.

       parameter
	      The actual value of a parameter to the prepared statement. This must be an expression yielding a value that is compatible  with  the
	      data type of this parameter, as was determined when the prepared statement was created.

OUTPUTS

       The command tag returned by EXECUTE is that of the prepared statement, and not EXECUTE.

EXAMPLES

       Examples are given in the Examples [prepare(7)] section of the PREPARE [prepare(7)] documentation.

COMPATIBILITY

       The  SQL  standard includes an EXECUTE statement, but it is only for use in embedded SQL. This version of the EXECUTE statement also uses a
       somewhat different syntax.

SEE ALSO

       DEALLOCATE [deallocate(7)], PREPARE [prepare(7)]

SQL - Language Statements					    2010-05-14								EXECUTE(7)
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