parallel bash scripts

[Mark LaPierre]

On 03/27/2012 05:25 PM, bruce wrote:
> hi.
>
> got a couple of test bash scripts.
>
> dog.sh, cat.sh
> each script runs the underlying php in an endless loop.
>
> I'm trying to figure out how to run the scripts in parallel, from the
> same parent shell script. something like:
>
> test.sh
>
>
> where dog.sh would be :
> --------------------------------
> while true
> do
>    pgrep dog
>    if [ $? -ne 0 ]
>    then
>      /dog.php
>    fi
> sleep 5
> done
>
> my current tests, run dog.sh, which runs the dog.php ... but the test
> never gets to run cat.sh
>
> thoughts/comments...
>
> thanks
Hey Bruce,

Do you mean to run these subprograms in parallel or in series?

cat.sh
#! /bin/bash

CAT=0
until [ $CAT -eq 10 ]
do
echo "Inside a dog it's too dark to read. $CAT"
CAT=$[$CAT + 1]
sleep 2
done


dog.sh
#! /bin/bash

DOG=0
until [ $DOG -eq 10 ]
do
echo "Next to a dog a book is man's best friend. $DOG"
DOG=$[$DOG + 1]
sleep 2
done


test.sh
#! /bin/sh

/home/mlapier/test/dog.sh 1>&2 &
/home/mlapier/test/cat.sh 1>&2 &


[mlapier at mushroom test]$ ./test.sh
[mlapier at mushroom test]$ Next to a dog a book is man's best friend. 0
Inside a dog it's too dark to read. 0
Next to a dog a book is man's best friend. 1
Inside a dog it's too dark to read. 1
Next to a dog a book is man's best friend. 2
Inside a dog it's too dark to read. 2
Next to a dog a book is man's best friend. 3
Inside a dog it's too dark to read. 3
Next to a dog a book is man's best friend. 4
Inside a dog it's too dark to read. 4
Next to a dog a book is man's best friend. 5
Inside a dog it's too dark to read. 5
Next to a dog a book is man's best friend. 6
Inside a dog it's too dark to read. 6
Next to a dog a book is man's best friend. 7
Inside a dog it's too dark to read. 7
Next to a dog a book is man's best friend. 8
Inside a dog it's too dark to read. 8
Next to a dog a book is man's best friend. 9
Inside a dog it's too dark to read. 9