Run python, with a parameter, on a cURL command on one line

Question

I want to run the following commands in one line:

$ curl https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py -O
$ python ./awslogs-agent-setup.py --region eu-west-2

How can I do this?

I tried the following

$ curl https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py -s | python --region eu-west-2

But I get the error:

Unknown option: --

you forgot ./awslogs-agent-setup.py after python, but that's not all, it's looks like ./awslogs-agent-setup.py expect to read a specific file on filesystem - so you will have to update it so it can read curl's output directly as argument — Arount
– Arount, Commented Dec 20, 2017 at 16:54
@Arount awslogs-agent-setup.py is the file being downloaded, he wants to execute it directly from the curl output rather than put it into a local file to execute it. — Barmar
– Barmar, Commented Dec 20, 2017 at 17:03

Inian · Accepted Answer · 2017-12-20 17:15:07Z

6

You could let the python interpreter read from stdin using /dev/stdin (similar to python -) and pass the additional arguments alongside.

curl https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py -s |\
     python /dev/stdin --region eu-west-2

As Barmar points out using /dev/stdin could be OS specific in which case using python - would be more standard

curl https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py -s |\
     python - --region eu-west-2

As curl outputs the file content to stdout, you can pipe it over to the standard input of the interpreter.

Or use process-substitution feature in bash (<()), which lets you treat the output of a command as if it were a file to read from

python <(curl https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py -s) --region eu-west-2

edited Dec 20, 2017 at 17:15

answered Dec 20, 2017 at 16:54

Inian

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1 Comment

Barmar Over a year ago

You can use - as the filename. Python follows the standard convention of treating - as a filename to mean standard input, then you're not depending on the OS-specific /dev/stdin.

Michael Ababio · Accepted Answer · 2017-12-20 18:30:45Z

0

Why not just use &&

curl https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py -O && python ./awslogs-agent-setup.py --region eu-west-2

and if you want to do without creating a file just to delete later, do this:

curl -s https://s3.amazonaws.com/aws-cloudwatch/downloads/latest/awslogs-agent-setup.py | python /dev/stdin --region eu-west-2

Execute bash script from URL

edited Dec 20, 2017 at 18:30

answered Dec 20, 2017 at 17:57

Michael Ababio

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2 Comments

Yahya Uddin Over a year ago

I don't want to create an uneeded file just to delete it

Yahya Uddin Over a year ago

Your second solution seems the same as @Inian answer, except it is in more detail and has more options

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