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Full Discussion: IF-Statements not working
Top Forums Shell Programming and Scripting IF-Statements not working Post 302353764 by Henry_Ford on Wednesday 16th of September 2009 06:29:40 AM
Old 09-16-2009
[SOLVED]IF-Statements not working
Dear Community,

I tried for over 4 days to figur this out.
I got a Shell-Code which contains some If-statements which are driving me crazy.
First of all the statements:
Code:
err=0;

echo "If-Test begins..."
if ! [[ "$err"==1 ]];then
echo "If NOT 0"
fi

if [[ "$err"!=0 ]];then
echo "If NOT (inside braces) 0"
fi

if [[ "$err"==1 ]];then
echo "If 0"
fi

if [[ "$err"==1 ]];then
echo "Using \" for 0"
fi

As "err" is 0 the last two statements shouldn't become true.
But when I am running the scrip the secon, third and fourth statement are returning "true" back, the first one not.
I really cannot get it... Where is my mistake?

Actually I tried every form of the comparison:
Code:
$err=0
$err==0
"$err"="0"
"$err"=="0"
'$err'='0'
 '$err'=='0'
$'err'='0'
$'err'=='0'

I also tried to mix the various format (eg. $err=="0") but really nothing is working.

---------- Post updated at 05:29 AM ---------- Previous update was at 05:22 AM ----------

Nervermind, just realisied that I have to put whitespaces between the argument and the variable...
Thanks anyway!
Last edited by Henry_Ford; 09-16-2009 at 07:30 AM.. Reason: [SOLVED]
 

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LEARN ABOUT OSX

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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