Insert parameters to python program from shell script

Question

I need to execute my python program from shell script so that the print commands in my python program will be exposed for reading from another program. the shell script:

#!/bin/bash

if [ $# -lt 1 ] || [ $# -gt 2 ];then
    echo "Usage: $0 APK <duration in seconds>"
    exit 1;
fi

printf "$(python '/root/Desktop/DroidBox_4.1.1/scripts/droidbox.py' $1 $2 -c 'import sys; exec sys.stdin.read()')"

My python program should get the parametrs $1 and $2 but it doesn't recognize those as parametrs but taking -c and the command after it as the parametrs.

For answers like: getting the process input stream in my other project won't work for me. the only way that seems to be working is to use -c option and the command 'exec sys.stdin.read()'.

thank you.

What does droidbox.py look like? If you print(sys.argv) in that script, what does it display? — Simon Fraser
– Simon Fraser, Commented May 23, 2016 at 14:02
I would not use the python output inside printf directly, instead use printf "%s" "$( python ... Then, what input should it read, the stdin of the shell script? Also, as test, you might assign variables from $1 and $2 and then use the variable names on the call to droidbox.py to avoid someone mangling with the position parameters. — Stefan Hegny
– Stefan Hegny, Commented May 23, 2016 at 14:09

smassey · Accepted Answer · 2016-05-23 14:09:43Z

1

It should work pretty well just the way you've written it. In a stripped down version here's what I get:

the (bash) test.sh script:

#!/bin/bash    
python /tmp/test.py $1 $2

the (python) test.py script:

import sys
print "in python"
print sys.argv

and finally a shell session:

smassey@hacklabs:/tmp $ ./test.sh hello world
in python
['/tmp/test.py', 'hello', 'world']

As you can see, the bash script calls the python script which prints values to stdout so they're just as exposed as anything else directed to stdout:

smassey@hacklabs:/tmp $ ./test.sh hello world | grep python | tr 'a-z' 'A-Z'
IN PYTHON

answered May 23, 2016 at 14:09

smassey

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Joris · Accepted Answer · 2016-05-23 14:34:15Z

0

The argparse module is very helpful as well. This allow you to add custom flags to your program (makes it more convenient to works with from a user's perspective as well).

answered May 23, 2016 at 14:34

Joris

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