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Full Discussion: Compare two arrays
Top Forums Shell Programming and Scripting Compare two arrays Post 302762877 by zaxxon on Tuesday 29th of January 2013 07:27:25 AM
Old 01-29-2013
For lists you could do something like:
Code:
#!/usr/bin/ksh

A="1 2 3 4"
B="5 6 2 7"

for a in $A; do
        for b in $B; do
                (( $a == $b )) && print $a
        done
done

exit 0

For arrays you'll have to declare them with set -A ..... and cycle through their elements by incrementing the index. Though it would be most likely 2 loops in each other like the example above.

Update:
Here an example with an array without incrementing the indexes and comparing strings instead of numbers.
But when there is no need for indexes, maybe a list will be sufficient instead of arrays. But when having spaces in file names it might be easier to use them as array elements than in a list (depending how the separator IFS is defined and used in the list of course).

Code:
#!/usr/bin/ksh

set -A ARR1 1 2 3 4
set -A ARR2 5 6 2 7

for a in ${ARR1[*]}; do
        for b in ${ARR2[*]}; do
                [[ "$a" = "$b" ]] && print $a
        done
done

exit 0

Last edited by zaxxon; 01-29-2013 at 08:45 AM.. Reason: no automatic update, merging posts
This User Gave Thanks to zaxxon For This Post:
frodo61
 

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getusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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