Shell script for 2 arrays

Shell Programming and Scripting
1

I have 2 arrays abc and xyz

abc = ( a b c d e f g h i j k l m n o p q r s t u v w x y z )

and

xyz = ( b c d e f )

lets assume a .... z are the file name.

I have to perform a pattern replacement on each file present in abc array accept the files i have in xyz array. and i am doing the update one each file one at a time.

how do i achieve this in shell script?

i might use a for loop for updating each file
for i in ${abc[@]}
do
.....
but if $i also exist in xyz array don't perform the task or update
done

2

Hi kukretiabhi13

Like this so you mean?

#!/bin/bash
abc=( "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z" )
xyz=( "b" "c" "d" "e" "f" )
 
for i in ${abc[@]}
  do
     for ix in ${xyz[@]}
       do
        if [ "$i" == "$ix" ] ; then
         echo $i
        fi
       done
  done

[root@rhnserver ~]# ./del
b
c
d
e
f
3

The following script proceeds the files from array abc but excludes the files from array xyz.

#!/usr/bin/bash

abc=( a b c d e f g h i j k l m n o p q r s t u v w x y z )
xyz=( b c d e f )

for file in "${xyz[@]}"
do
   exclude="${exclude}�${file}�"
done

for file in "${abc[@]}"
do
   if [[ "${exclude}" == *�${file}�* ]]
   then
      echo "Ignore file ${file}"
      continue
   fi
   echo "Proceed file ${file}"
done

Output:

Proceed file a
Ignore file b
Ignore file c
Ignore file d
Ignore file e
Ignore file f
Proceed file g
Proceed file h
Proceed file i
Proceed file j
Proceed file k
Proceed file l
Proceed file m
Proceed file n
Proceed file o
Proceed file p
Proceed file q
Proceed file r
Proceed file s
Proceed file t
Proceed file u
Proceed file v
Proceed file w
Proceed file x
Proceed file y
Proceed file z

Jean-Pierre.

4

Thanks your solution is working but i cannot understand this part.

exclude="${exclude}�${file}�"
and
if [[ "${exclude}" == *�${file}�* ]]

5

The following code builds the list of files to be excluded, the character � surrounds each file inside the list:

for file in "${xyz[@]}"
do
   exclude="${exclude}�${file}�"
done

The resulting value of the variable exclude is �a��b��c��d�

This following statement tets if the file is present inside this list:

if [[ "${exclude}" == *�${file}�* ]]

Hope this will help you.

Jean-Pierre.