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08.08.2007 at 08:31AM PDT, ID: 22749596
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8.0

quoting param in scripts (bash)

Asked by dportabella in Bourne-Again Shell (bash)

Tags:

Having these two scripts:

+++++++ test ++++++++++
#! /bin/bash

echo p1 = $1
echo p2 = $2
echo p3 = $3
+++++++++++++++++++++

+++++++ add_param ++++
#! /bin/bash

./test newparam $*
+++++++++++++++++++++

this is an example execution:
$ ./add_param p1 p2  
p1 = newparam
p2 = p1
p3 = p2

However, when the parameters have spaces, it does not have the expected behavior:
$ ./add_param "p1 with spaces" p2
p1 = newparam
p2 = p1
p3 = with

This can be solved by modifying the add_param script as follows:
+++++++ add_param ++++
#! /bin/bash

./test newparam "$1" "$2"
+++++++++++++++++++++

With this, we have:
$ ./add_param "p1 with spaces" p2
p1 = newparam
p2 = p1 with spaces
p3 = p2

Correct.

However, I had to substitute $* for  "$1" "$2" ...
What if I didn't know the number of parameters in advance?

I could substitute if for "$1" "$2" ... "$9".
However, this does not look nice to me, and it still could have more than 9 parameters.

What is the correct way to write the "add_param" script?





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[+][-]08.08.2007 at 08:35AM PDT, ID: 19655075

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[+][-]08.08.2007 at 08:47AM PDT, ID: 19655203

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About this solution

Zone: Bourne-Again Shell (bash)
Tags: bash
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Solution Provided By: ozo
Participating Experts: 1
Solution Grade: A
 
 
 
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