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Let's say, I'm running multiple instances of process w1 (from source code while1.c) in the background (while1.c contains an infinite while loop):

gcc while1.c -o w1

./w1&

./w1&

./w1&

./w1&

Now I want to get the PID of every instance. For that am doing this:

var=$(/bin/ps r -o pid,cmd|grep "w1"| grep -v "grep"|awk '{print $1}')

That will store pid of all instances of w1 in var.
So, if I do:

echo $var

It will print out PIDs of all instances of w1.

But I want to access individual PIDs, i.e. something like:

echo ${var[0]}

echo ${var[1]}

And so on (something like arrays). How to do that?

PS: echo ${var[0]} is printing all PIDs while echo ${var[1]} or echo ${var[2]} and so on, is printing nothing (i.e. blank lines of output).

Let's say I'm running multiple instances of process w1 (from source code while1.c) in the background (while1.c contains an infinite while loop):

gcc while1.c -o w1
./w1&
./w1&
./w1&
./w1&

Now I want to get the PID of every instance. For that, I am doing this:

var=$(/bin/ps r -o pid,cmd|grep "w1"| grep -v "grep"|awk '{print $1}')

That will store the PIDs of all instances of w1 in $var.
So, if I do:

echo $var

It will print out the PIDs of all instances of w1.

But I want to access individual PIDs, i.e. something like:

echo ${var[0]}
echo ${var[1]}

And so on (something like arrays). How can I do that?

PS: echo ${var[0]} is printing all PIDs while echo ${var[1]} or echo ${var[2]} and so on, is printing nothing (i.e. blank lines of output).

Let's say, am running multiple instances of process while1.c in background (while1.c contains an infinite while loop):

gcc while1.c -o w1

./w1&

./w1&

./w1&

./w1&

Now I want to get the pid of every instance. For that am doing this:

var=$(/bin/ps r -o pid,cmd|grep "w1"| grep -v "grep"|awk '{print $1}')

That will store pid of all instances of w1 in var. So, if i do

echo $var

it will print out pid's of all instances of w1.

But I want to access individual pid's ,i.e., something like:

echo ${var[0]}

echo ${var[1]}

and so on(something like arrays). How to do that?

PS:echo ${var[0]} is printing all pid's while echo ${var[1]}orecho ${var[2]} and so on, is printing nothing(i.e. blank lines of output).

Let's say, I'm running multiple instances of process w1 (from source code while1.c) in the background (while1.c contains an infinite while loop):

gcc while1.c -o w1

./w1&

./w1&

./w1&

./w1&

Now I want to get the PID of every instance. For that am doing this:

var=$(/bin/ps r -o pid,cmd|grep "w1"| grep -v "grep"|awk '{print $1}')

That will store pid of all instances of w1 in var. 
So, if I do:

echo $var

It will print out PIDs of all instances of w1.

But I want to access individual PIDs, i.e. something like:

echo ${var[0]}

echo ${var[1]}

And so on  (something like arrays). How to do that?

PS:  echo ${var[0]} is printing all PIDs while echo ${var[1]} or echo ${var[2]} and so on, is printing nothing  (i.e. blank lines of output).