Removing duplicate items from an array Post: 303007381

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Top Forums Shell Programming and Scripting Removing duplicate items from an array Post 303007381 by mukulverma2408 on Wednesday 15th of November 2017 10:29:20 PM

11-15-2017

Registered User

Removing duplicate items from an array

Hello Experts,

I am trying to write a shell script to find duplicate items in an array, this is what i have tried :

Code:

#!/bin/bash
echo "This is another sample Progg to remove duplicate items from an array"
echo "How many number do you want to insert"
read n
for (( i=0; i<$n; i++ ))
do
   echo "Enter Number"
   read num
   arr[i]=$num
done
 echo "Insertion is done, Below are the element of the array"
 echo ${arr[@]}

for (( i=0; i<$n; i++ ))
do
    echo "------------i here is ${arr[i]}-------" 
    for (( j=0; j<$n; j++ ))
  do
       echo "j here is ${arr[j]}"
      if [[ $i -eq $j ]]
        then
           echo "Skip this iteration"
            continue
        else
           if [[ arr[i] -eq arr[j] ]]
             then
                 echo "There is a duplicate!!"
                 arr=(${arr[@]:0:$j} ${arr[@]:(( $j+1))})
                 break
           fi
      fi
  done
done
echo ${arr[@]}

The script is working properly and removing the duplicate element as expected, the problem is since i am using a counter (variable n) equivalent to number of items in array to loop, the number of iteration is always constant even though I am popping out the duplicate element as soon as it is encountered.

Any help on how to optimise the script to remove the iteration that are not required?

mukulverma2408

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LEARN ABOUT SUSE

menu_items

items(3MENU)															      items(3MENU)

NAME

       items - make and break connections between items and menus

SYNOPSIS

       #include <menu.h>
       int set_menu_items(MENU *menu, ITEM **items);
       ITEM **menu_items(const MENU *menu);
       int item_count(const MENU *menu);

DESCRIPTION

       The function set_menu_items changes the item pointer array of the given menu.  The array must be terminated by a NULL.

       The function menu_items returns the item array of the given menu.

       The function item_count returns the count of items in menu.

RETURN VALUES

       The function menu_items returns a pointer (which may be NULL).  It does not set errno.

       The function item_count returns ERR (the general curses error return value) if its menu parameter is NULL.

       The function set_menu_items returns one of the following codes on error:

       E_OK The routine succeeded.

       E_BAD_ARGUMENT
	    Routine detected an incorrect or out-of-range argument.

       E_NOT_CONNECTED
	    No items are connected to the menu.

       E_POSTED
	    The menu is already posted.

       E_SYSTEM_ERROR
	    System error occurred (see errno).

SEE ALSO

       ncurses(3NCURSES), menu(3MENU).

NOTES

       The header file <menu.h> automatically includes the header file <curses.h>.

PORTABILITY

       These routines emulate the System V menu library.  They were not supported on Version 7 or BSD versions.

       The SVr4 menu library documentation specifies the item_count error value as -1 (which is the value of ERR).

AUTHORS

       Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S. Raymond.

																      items(3MENU)