How trigger multiple dependent programs using shell?

Question

I have an application which is modularised like this:

`APP
    PART1
       part1.sh
    PART2
       part2.o
    PART3
       part3.o`

Input file for part1.o generates a output file that is again input file for part2.o, which generates another file, which is input for part3.o and finally the output for overall app.

I'm intending to have a run.sh file that should take the first input file for the sub-application (part1) and so and forth trigger the rest of the sub-applications and store the last output in a file name, mentioned with command. Something like this:

run.sh input.txt output.txt

Currently my shell looks like this:

OUTPUT1="output1.txt"
OUTPUT2="output2.txt"
./PART1/part1.sh  $0 > OUTPUT1 &&
./PART2/part2.o < OUTPUT1 > OUTPUT2 &&
./PART3/part3.o < OUTPUT2 > $1

Currently, if I run this code, I get the following output indefinitely long:

+ ./run.sh
+ ./run.sh
+ ./run.sh
.
.
.
.

Can anyone help me with this? What am I doing wrong?

What were you expecting < $0 to accomplish? Do you really want part1.sh to process the contents of the file run.sh? — John1024
– John1024, Commented Jun 14, 2016 at 1:16
@John1024 I see. I have fixed that part, but it still causes the same behavior. I want to trigger part1.sh from run.sh (the other way round). — kishoredbn
– kishoredbn, Commented Jun 14, 2016 at 1:22
What do you expect ./PART1/part1.sh $0 to accomplish? Please explain what you think $0 means. — John1024
– John1024, Commented Jun 14, 2016 at 1:29
@John1024 I thought i was referring to input.txt with $0 — kishoredbn
– kishoredbn, Commented Jun 14, 2016 at 1:32

ppp · Accepted Answer · 2016-06-14 01:28:37Z

2

You are using positional parameters incorrectly.

run.sh input.txt output.txt

will populate positional params with values given below

$0 = run.sh

$1 = input.txt

$2 = output.txt

1 Comment

kishoredbn Over a year ago

Sweet. Got it. That was super dumb from my part. Thanks.

Collectives™ on Stack Overflow

How trigger multiple dependent programs using shell?

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related