Shell script array

[Jason Tan]

how to use array in shell script? can show me examples on how to assign/extract value on array? If i'm going to assign nearly thousand of value into array, can it support?

I have this situation, i got list A and list B. I need to compare value on list A and B and output ONLY value that is same on both list, got better idea others than diff command?

[Jdamian]

Did you try 'comm' command ?

[john korterman]

Hi,
an aexample of a ksh array (up to 1024). First, assign some values:

# list_A[1]="position no. 1"
# list_A[2]="position no. 2"
# list_A[0]="position no. zero"
# list_A[1023]="position no. 1023"

Then, show the content:

# echo ${list_A[0]}
position no. zero

# NUMBER=1022
# echo ${list_A[$NUMBER+1]}
position no. 1023

Regards,
John K.

[Carlos Fernandez Riera]

some more commands:

sdiff
join

[Julio Yamawaki]

Also, you can define a string using set -A a b c d e f

and address this VAR_NAME using
$VAR_NAME[0]....

[Stanimir · Accepted solution]

Try to use /after small modifications/ this:

for unm in `awk -F: '{print $1}' /etc/passwd`; do
par1=`grep "$unm" /etc/group`
if [ "$par1" = "" ]; then
echo "no matches for unm"
else
echo "$unm already has in /etc/group"
fi
done

Regards,Stan