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POBash parse & concatenate arguments for executing python
 

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  1. POBash parse & concatenate arguments for executing python
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    <p>I've got a bootstrap (bash) that should filter out some arguments before it starts the propper python script.</p> <p>The problem is that whenever i pass a string with spaces into the bootstrap it gets mangled up once it arrives at python</p> <p>e.g executing</p> <pre><code>./myBootStrap.sh --preload "argl bargl" -j -as -argl --postload "my Test" </code></pre> <p>prints this</p> <pre><code>Executing myBootStrap --preload "argl bargl" -j -as -argl --postload "my Test" </code></pre> <p>and my python script prints its argument </p> <pre><code>got arguments ['myBootStrap','--preload', '"argl', 'bargl"', '-j', '-as', '-argl', '--postload', '"my', 'Test"'] </code></pre> <p>as you see the "argl bargl" and "my Test" get split up into ['"argl','bargl"'] &amp; ['"my', 'Test"'] instead of staying combined.</p> <p>any idea whats wrong with my code ?</p> <p>thanks heaps!</p> <hr> <p>myBootStrap.sh</p> <pre><code>#!/bin/bash declare -a argv for ((i=1;i&lt;=${#@};i+=1)) do arg=${@:i:1} if [[ "$arg" == "--preload"* ]];then i=$i+1 marg=${@:$((i)):1} preLoadO=$arg preLoadA=" \"${marg}\"" argv=("${argv[@]}" $arg) argv=("${argv[@]}" $preLoadA) elif [[ "$arg" == "--postload"* ]];then i=$i+1 marg=${@:$((i)):1} postLoadO=$arg postLoadA=" \"${marg}\"" argv=("${argv[@]}" $arg) argv=("${argv[@]}" $postLoadA) else argv=("${argv[@]}" $arg) fi done arguments=$(printf " %s" "${argv[@]}") arguments=${arguments:1} echo "Executing myBootStrap" $arguments exec myBootStrap $arguments </code></pre> <p>and the python script myBootStrap</p> <pre><code>#!/usr/bin/env python import sys print 'got arguments %s'%sys.argv </code></pre>
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    1. COpython has builtin capabilities for allowing you to parse command line arguments: [`getopt`](http://docs.python.org/library/getopt), [`argparse`](http://docs.python.org/library/argparse) or [`optparse`](http://docs.python.org/library/optparse) (deprecated!). do yourself a favour and use them, it's a lot easier then parsing aruments in bash using `printf` and manually quoting strings...
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      1. USmata
    2. COunfortunately i have to go through bash first, because it sets up a lot of env-variables etc, so there is no way to go around bash :(
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      1. USSeb
    3. COthen i'd recommend [GNU `getopt`](http://linux.die.net/man/1/getopt)
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      1. USmata
 

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