Problem with running a .sh script in remote location

Question

I have a code of python in lets say test.py. I need to run it using Slurm in a remote location. Thats why I am trying to make a .sh file.

In Putty, I am doing these:

touch main.sh
echo #!/bin/bash > main.sh
....
echo #SBATCH --gres=gpu:1 >> main.sh
....
echo python3 train.py >> main.sh

Then I make it executable with

chmod u+x main.sh

And I try to run it with

bash main.sh

But I am getting this error:

sbatch: error: This does not look like a batch script.  The first
sbatch: error: line must start with #! followed by the path to an interpreter.
sbatch: error: For instance: #!/bin/sh

As I try to check

file main.sh

I am getting

main.sh: ASCII text

I am a novice in bash. So I cant understand what the issue is. Can someone help?

# is the shell comment marker, so the command echo #!/bin/bash > main.sh is treated as echo with the comment #!/bin/bash > main.sh... and of course the comment part is ignored. So you need to quote or escape the #. Depending on what shell you're using and what mode it's in, ! may also be a special character (even in double-quotes!). So it's safest to just single-quote the entire string. — Gordon Davisson
– Gordon Davisson, Commented Jun 27, 2021 at 23:10
@KhabbabZakaria: Depending on how you configure your bash, echo #!/bin/bash will write, when invoked on the command line, #!/bin/bash to stdout, while when invoked in a script (or configured differently), the same statement will just output a newline character. Google for interactive comments to get more insight in this thema. — user1934428
– user1934428, Commented Jun 28, 2021 at 6:29

cardosource · Accepted Answer · 2021-06-27 23:03:31Z

2

The only difference is that I used single quotes

touch main.sh
echo '#!/bin/bash' > main.sh
echo '#SBATCH --gres=gpu:1' >> main.sh
echo 'python3 --version' >> main.sh

echo 'python3 /home/Desktop/train.py' >> main.sh

If train.py is in another directory, you will have to indicate the location

answered Jun 27, 2021 at 23:03

cardosource

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