global variable not being set Post: 302203166

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Top Forums Shell Programming and Scripting global variable not being set Post 302203166 by robotball on Friday 6th of June 2008 05:57:04 PM

06-06-2008

Registered User

global variable not being set

In ksh I thought a global variable was any variable in a script or function that did not have the typeset command. I have a global in my calling script which I increment in a function, but the value does not change in the calling script. Here is the code:

function f_open_log
{
typeset -r TRUE=0
typeset -r FALSE=1
typeset -r SUCCESS=0
typeset -r FAILURE=1
typeset append=${FALSE}
typeset no_timestamp=${FALSE}

[[ $# -gt 0 ]] && [[ "x$1" = x-a ]] && { append=${TRUE}; shift; }
[[ $# -gt 0 ]] && [[ "x$1" = x-nt ]] && { no_timestamp=${TRUE}; shift; }

[[ $# < 1 ]] && return $FAILURE

next_fh=${LOG_FH_COUNTER}

if [[ ${append} == ${FALSE} ]] ; then
f_file_exists "${1}"
[[ $? == ${FAILURE} ]] && return $FAILURE

f_filechk "${1}"
[[ $? == ${FAILURE} ]] && return $FAILURE

eval "exec $next_fh>$1"
else
f_file_exists -i "${1}"
[[ $? == ${FAILURE} ]] && return $FAILURE

eval "exec $next_fh>>$1"
fi

[[ ${no_timestamp} == ${FALSE} ]] && [[ ${append} == ${FALSE} ]] && f_print_log -nv $next_fh "Log file opened"
[[ ${no_timestamp} == ${FALSE} ]] && [[ ${append} == ${TRUE} ]] && f_print_log -nv $next_fh "Log file re-opened"

(( LOG_FH_COUNTER=LOG_FH_COUNTER + 1 ))

print ${next_fh}
return $SUCCESS
}
******************************
#!/bin/ksh

. f_log.sh

### GLOBALS
VERBOSE=0
LOG_FH_COUNTER=3

echo "LOG_FH_COUNTER START = ${LOG_FH_COUNTER}"

### OPEN LOG
LOG=$(f_open_log myfile)
[[ $? == 1 ]] && print "ERROR in $0" && exit 1

echo "LOG_FH_COUNTER HERE = ${LOG_FH_COUNTER}"

LOG2=$(f_open_log bigfile)
[[ $? == 1 ]] && print "ERROR in $0" && exit 1

echo "LOG_FH_COUNTER AGAIN = ${LOG_FH_COUNTER}"

exit
*************************************************
The value of LOG_FH_COUNTER remains 3 although it should increment to 4 and 5. I did have a print statement in the function and I see the value changing to 4, but when it returns to the calling script it's 3.

Any help would be greatly appreciated. Thanks.

robotball

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LEARN ABOUT OPENDARWIN

variable

variable(n)						       Tcl Built-In Commands						       variable(n)

__________________________________________________________________________________________________________________________________________________

NAME

       variable - create and initialize a namespace variable

SYNOPSIS

       variable ?name value...? name ?value?
_________________________________________________________________

DESCRIPTION

       This  command  is  normally used within a namespace eval command to create one or more variables within a namespace.  Each variable name is
       initialized with value.	The value for the last variable is optional.

       If a variable name does not exist, it is created.  In this case, if value is specified, it is assigned to the newly created  variable.	If
       no  value  is  specified,  the new variable is left undefined.  If the variable already exists, it is set to value if value is specified or
       left unchanged if no value is given.  Normally, name is unqualified (does not include the names of  any	containing  namespaces),  and  the
       variable  is  created in the current namespace.	If name includes any namespace qualifiers, the variable is created in the specified names-
       pace.  If the variable is not defined, it will be visible to the namespace which command, but not to the info exists command.

       If the variable command is executed inside a Tcl procedure, it creates local variables linked to the corresponding namespace variables (and
       therefore  these  variables are listed by info locals.)	In this way the variable command resembles the global command, although the global
       command only links to variables in the global namespace.  If any values are given, they are used to modify the  values  of  the	associated
       namespace variables.  If a namespace variable does not exist, it is created and optionally initialized.

       A name argument cannot reference an element within an array.  Instead, name should reference the entire array, and the initialization value
       should be left off.  After the variable has been declared, elements within the array can be set using ordinary set or array commands.

SEE ALSO

       global(n), namespace(n), upvar(n)

KEYWORDS

       global, namespace, procedure, variable

Tcl									8.0							       variable(n)