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Full Discussion: How to append to array within conditional block in ksh/korn shell?
Top Forums Shell Programming and Scripting How to append to array within conditional block in ksh/korn shell? Post 302808275 by sanzee007 on Thursday 16th of May 2013 10:30:17 AM
Old 05-16-2013
How to append to array within conditional block in ksh/korn shell?
Hi,
I have one array created and some values are there in ksh. I want to append some other values to it based on some condition in if statement.
Code:
#!/bin/ksh
echo "---------------------------------------------------"
        set -A ipaddr_arr $(egrep -v '^#|^::|^$' /etc/hosts |awk '{print $1}' | uniq) #hosts ips
        set +A ipaddr_arr $(egrep -v '^#|^::|^$' /etc/hosts |awk '{print $1}') 


        if [ "$os" = "solaris" ]
        then
                set +A ipaddr_arr $(egrep -v '^#|^::|^$' /etc/hosts |awk '{print $1}')
        else
               #some other statement
        fi

        COUNT=0
        for str in ${ipaddr_arr[*]}
        do
                echo "$str"
                COUNT=$((COUNT+1))
        done

However after the if condition is executed as true, the array does not contain previous values. The statement within if overwrites the array values, without appending the values to it. As in ksh, +A is for appending values to array. However here it is not behaving properly.

I tried with only giving this in if block, still it gives error in ksh-
Code:
+A ipaddr_arr $(egrep -v '^#|^::|^$' /etc/hosts |awk '{print $1}')

Anyone have any clues..
thanks in advance for your replies.
Last edited by zaxxon; 05-16-2013 at 11:58 AM.. Reason: more code tags
 

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LEARN ABOUT OPENSOLARIS

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)
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