bash function implement python command












1















I have this 



python -c "import sys, urllib as ul; 

    print ul.quote('sample hihi ')"


How can I wrap it into a bash function, so I can call it like a function like so:



urlencode('sample hihi ')


Thanks






bash functions







share|improve this question


















  • 1





    This question should asked on stackoverflow, the possibility to receive an answer is higher then here.

    – AtomiX84
    Jan 14 at 9:49











  • @AtomiX84 shell scripting is perfectly on topic here. Please don't recommend moving on topic questions.

    – terdon♦
    Jan 15 at 15:14
















1















I have this 



python -c "import sys, urllib as ul; 

    print ul.quote('sample hihi ')"


How can I wrap it into a bash function, so I can call it like a function like so:



urlencode('sample hihi ')


Thanks






bash functions







share|improve this question


















  • 1





    This question should asked on stackoverflow, the possibility to receive an answer is higher then here.

    – AtomiX84
    Jan 14 at 9:49











  • @AtomiX84 shell scripting is perfectly on topic here. Please don't recommend moving on topic questions.

    – terdon♦
    Jan 15 at 15:14














1












1








1








I have this 



python -c "import sys, urllib as ul; 

    print ul.quote('sample hihi ')"


How can I wrap it into a bash function, so I can call it like a function like so:



urlencode('sample hihi ')


Thanks






bash functions







share|improve this question














I have this 



python -c "import sys, urllib as ul; 

    print ul.quote('sample hihi ')"


How can I wrap it into a bash function, so I can call it like a function like so:



urlencode('sample hihi ')


Thanks






bash functions




bash functions






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Jan 14 at 9:41









Born vs. MeBorn vs. Me

115




115








  • 1





    This question should asked on stackoverflow, the possibility to receive an answer is higher then here.

    – AtomiX84
    Jan 14 at 9:49











  • @AtomiX84 shell scripting is perfectly on topic here. Please don't recommend moving on topic questions.

    – terdon♦
    Jan 15 at 15:14














  • 1





    This question should asked on stackoverflow, the possibility to receive an answer is higher then here.

    – AtomiX84
    Jan 14 at 9:49











  • @AtomiX84 shell scripting is perfectly on topic here. Please don't recommend moving on topic questions.

    – terdon♦
    Jan 15 at 15:14








1




1





This question should asked on stackoverflow, the possibility to receive an answer is higher then here.

– AtomiX84
Jan 14 at 9:49





This question should asked on stackoverflow, the possibility to receive an answer is higher then here.

– AtomiX84
Jan 14 at 9:49













@AtomiX84 shell scripting is perfectly on topic here. Please don't recommend moving on topic questions.

– terdon♦
Jan 15 at 15:14





@AtomiX84 shell scripting is perfectly on topic here. Please don't recommend moving on topic questions.

– terdon♦
Jan 15 at 15:14










1 Answer
1






active

oldest

votes


















4














You should pass the function arguments into your Python code as regular shell arguments, which can be accessed there through the sys.argv array. In the Bash function, its call arguments can be accessed e.g. through "$*", which returns all arguments as a single, space separated string argument (as if it were quoted as a whole, not separate tokens).



Here's an example that follows your original code:



urlquote() { python -c 'import sys, urllib as ul; print ul.quote(sys.argv[1])' "$*" ;}


However, as Python 2 support will end soon, here's the better Python 3 equivalent:



urlquote() { python3 -c 'import sys, urllib.parse as ul; print(ul.quote(sys.argv[1]))' "$*" ;}


The invocation is the same for both, type the function name followed by the string you want to encode as argument. Don't forget to quote it appropriately:



$ urlquote "roses are red, violets are blue..."

roses%20are%20red%2C%20violets%20are%20blue...



Note: Don't ever directly inject shell arguments into your Python code string, like python -c "print('$x')", as this could lead to easily exploitable security risks if you ever plan to run your function on untrusted input, allowing people to run arbitrary commands!



Have a look at this shell example, where I craft the argument in the variable x in a way to run the system command uname (which is harmless and just prints "Linux", but you can do everything here):



$ x="');import os;os.system('uname');('"



$ python3 -c "print('$x')"

Linux





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    4














    You should pass the function arguments into your Python code as regular shell arguments, which can be accessed there through the sys.argv array. In the Bash function, its call arguments can be accessed e.g. through "$*", which returns all arguments as a single, space separated string argument (as if it were quoted as a whole, not separate tokens).



    Here's an example that follows your original code:



    urlquote() { python -c 'import sys, urllib as ul; print ul.quote(sys.argv[1])' "$*" ;}


    However, as Python 2 support will end soon, here's the better Python 3 equivalent:



    urlquote() { python3 -c 'import sys, urllib.parse as ul; print(ul.quote(sys.argv[1]))' "$*" ;}


    The invocation is the same for both, type the function name followed by the string you want to encode as argument. Don't forget to quote it appropriately:



    $ urlquote "roses are red, violets are blue..."
    
roses%20are%20red%2C%20violets%20are%20blue...



    Note: Don't ever directly inject shell arguments into your Python code string, like python -c "print('$x')", as this could lead to easily exploitable security risks if you ever plan to run your function on untrusted input, allowing people to run arbitrary commands!



    Have a look at this shell example, where I craft the argument in the variable x in a way to run the system command uname (which is harmless and just prints "Linux", but you can do everything here):



    $ x="');import os;os.system('uname');('"
    

    
$ python3 -c "print('$x')"
    
Linux





    share|improve this answer




























      4














      You should pass the function arguments into your Python code as regular shell arguments, which can be accessed there through the sys.argv array. In the Bash function, its call arguments can be accessed e.g. through "$*", which returns all arguments as a single, space separated string argument (as if it were quoted as a whole, not separate tokens).



      Here's an example that follows your original code:



      urlquote() { python -c 'import sys, urllib as ul; print ul.quote(sys.argv[1])' "$*" ;}


      However, as Python 2 support will end soon, here's the better Python 3 equivalent:



      urlquote() { python3 -c 'import sys, urllib.parse as ul; print(ul.quote(sys.argv[1]))' "$*" ;}


      The invocation is the same for both, type the function name followed by the string you want to encode as argument. Don't forget to quote it appropriately:



      $ urlquote "roses are red, violets are blue..."
      
roses%20are%20red%2C%20violets%20are%20blue...



      Note: Don't ever directly inject shell arguments into your Python code string, like python -c "print('$x')", as this could lead to easily exploitable security risks if you ever plan to run your function on untrusted input, allowing people to run arbitrary commands!



      Have a look at this shell example, where I craft the argument in the variable x in a way to run the system command uname (which is harmless and just prints "Linux", but you can do everything here):



      $ x="');import os;os.system('uname');('"
      

      
$ python3 -c "print('$x')"
      
Linux





      share|improve this answer


























        4












        4








        4







        You should pass the function arguments into your Python code as regular shell arguments, which can be accessed there through the sys.argv array. In the Bash function, its call arguments can be accessed e.g. through "$*", which returns all arguments as a single, space separated string argument (as if it were quoted as a whole, not separate tokens).



        Here's an example that follows your original code:



        urlquote() { python -c 'import sys, urllib as ul; print ul.quote(sys.argv[1])' "$*" ;}


        However, as Python 2 support will end soon, here's the better Python 3 equivalent:



        urlquote() { python3 -c 'import sys, urllib.parse as ul; print(ul.quote(sys.argv[1]))' "$*" ;}


        The invocation is the same for both, type the function name followed by the string you want to encode as argument. Don't forget to quote it appropriately:



        $ urlquote "roses are red, violets are blue..."
        
roses%20are%20red%2C%20violets%20are%20blue...



        Note: Don't ever directly inject shell arguments into your Python code string, like python -c "print('$x')", as this could lead to easily exploitable security risks if you ever plan to run your function on untrusted input, allowing people to run arbitrary commands!



        Have a look at this shell example, where I craft the argument in the variable x in a way to run the system command uname (which is harmless and just prints "Linux", but you can do everything here):



        $ x="');import os;os.system('uname');('"
        

        
$ python3 -c "print('$x')"
        
Linux





        share|improve this answer













        You should pass the function arguments into your Python code as regular shell arguments, which can be accessed there through the sys.argv array. In the Bash function, its call arguments can be accessed e.g. through "$*", which returns all arguments as a single, space separated string argument (as if it were quoted as a whole, not separate tokens).



        Here's an example that follows your original code:



        urlquote() { python -c 'import sys, urllib as ul; print ul.quote(sys.argv[1])' "$*" ;}


        However, as Python 2 support will end soon, here's the better Python 3 equivalent:



        urlquote() { python3 -c 'import sys, urllib.parse as ul; print(ul.quote(sys.argv[1]))' "$*" ;}


        The invocation is the same for both, type the function name followed by the string you want to encode as argument. Don't forget to quote it appropriately:



        $ urlquote "roses are red, violets are blue..."
        
roses%20are%20red%2C%20violets%20are%20blue...



        Note: Don't ever directly inject shell arguments into your Python code string, like python -c "print('$x')", as this could lead to easily exploitable security risks if you ever plan to run your function on untrusted input, allowing people to run arbitrary commands!



        Have a look at this shell example, where I craft the argument in the variable x in a way to run the system command uname (which is harmless and just prints "Linux", but you can do everything here):



        $ x="');import os;os.system('uname');('"
        

        
$ python3 -c "print('$x')"
        
Linux






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 14 at 10:28









        Byte CommanderByte Commander

        64.1k27176294




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