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Full Discussion: problems calling out variables in a loop
Top Forums Shell Programming and Scripting problems calling out variables in a loop Post 302339689 by strasner on Friday 31st of July 2009 07:01:00 AM
Old 07-31-2009
problems calling out variables in a loop
good afternoon forums.
i have a problem that ive been trying to work out all morning and cant seem to get my head around it.
what i have in my script is individual letters saved in different variables. so if the word unix was saved then 'u' would be stored in the variable 'wvar1' 'n' in 'wvar2' 'i' in 'wvar3' and x in 'wvar4'.
what i want to do is loop through each of these to see wether an inputed letter 'in1' is the same as what is in each variable, one at a time. I have come up with the following script.
Code:
1)for (( i = 0; i <= 4; i++ ))
2)do
3)rdm=$(($rdm + 1))
4)testvar=$(eval echo $wvar$rdm)
5)if [[ $in1 = $testvar ]]
6)then
7)eval xnum$rdm=$in1
8)fi

1-makes the code loop 4 times
3-adds 1 to the variable rdm each time it loops around
4-testvariable changes each time it goes through the loop to be equal to wvar1 the first time it loops, wvar2 for the second time etc...
5-if the inputed character is equal to the saved variable then do the next command
7-creates a new variable which is equal to the inputed character

I hope i explained my problem well enough for some genius to figure out whats wrong with it. I have been on this same problem for a day and a half now...
 

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LEARN ABOUT CENTOS

export

EXPORT(1P)						     POSIX Programmer's Manual							EXPORT(1P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       export - set the export attribute for variables

SYNOPSIS

       export name[=word]...

       export -p

DESCRIPTION

       The shell shall give the export attribute to the variables corresponding to the specified names, which shall cause them to be in the  envi-
       ronment of subsequently executed commands. If the name of a variable is followed by = word, then the value of that variable shall be set to
       word.

       The export special built-in shall support the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.

       When -p is specified, export shall write to the standard output the names and values of all exported variables, in the following format:

	      "export %s=%s
", <name>, <value>

       if name is set, and:

	      "export %s
", <name>

       if name is unset.

       The shell shall format the output, including the proper use of quoting, so that it is suitable for reinput to the shell	as  commands  that
       achieve the same exporting results, except:

	1. Read-only variables with values cannot be reset.

	2. Variables  that  were  unset  at  the time they were output need not be reset to the unset state if a value is assigned to the variable
	   between the time the state was saved and the time at which the saved output is reinput to the shell.

       When no arguments are given, the results are unspecified.

OPTIONS

       See the DESCRIPTION.

OPERANDS

       See the DESCRIPTION.

STDIN

       Not used.

INPUT FILES

       None.

ENVIRONMENT VARIABLES

       None.

ASYNCHRONOUS EVENTS

       Default.

STDOUT

       See the DESCRIPTION.

STDERR

       The standard error shall be used only for diagnostic messages.

OUTPUT FILES

       None.

EXTENDED DESCRIPTION

       None.

EXIT STATUS

       Zero.

CONSEQUENCES OF ERRORS

       Default.

       The following sections are informative.

APPLICATION USAGE

       None.

EXAMPLES

       Export PWD and HOME variables:

	      export PWD HOME

       Set and export the PATH variable:

	      export PATH=/local/bin:$PATH

       Save and restore all exported variables:

	      export -p > temp-fileunset a lot of variables... processing. temp-file

RATIONALE

       Some historical shells use the no-argument case as the functional equivalent of what is required  here  with  -p.  This	feature  was  left
       unspecified  because  it is not historical practice in all shells, and some scripts may rely on the now-unspecified results on their imple-
       mentations. Attempts to specify the -p output as the default case were unsuccessful in achieving consensus. The	-p  option  was  added	to
       allow portable access to the values that can be saved and then later restored using; for example, a dot script.

FUTURE DIRECTIONS

       None.

SEE ALSO

       Special Built-In Utilities

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								EXPORT(1P)
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