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Full Discussion: Strange type mistake?!
Top Forums Shell Programming and Scripting Strange type mistake?! Post 302913345 by Corona688 on Friday 15th of August 2014 11:46:32 AM
Old 08-15-2014
Oh! I'd missed the IFS! That's very important.

That's almost certainly related to your issue... IFS controls all splitting! So your script is effectively being forcefed each element as one parameter like:

Code:
./script "-N 0 -m 0"

instead of being split like you'd want, into

Code:
./script "-N" "0" "-m" "0"

...because that string contains no single-quotes to split upon.

Anyway, you don't need to set IFS here at all. It only controls how unquoted strings work in an array, it has nothing to do with the behavior of quotes themselves. Just be sure to quote your variables where you don't want them to split!

Code:
CONFIGURATION_ARRAY=( '-N 0 -m 0' '-N 0 -m 1'  )

for configuration in "${CONFIGURATION_ARRAY[@]}"
do
        printf "Quoted does not split: %s\n" "$configuration"
        printf "Unquoted split:  %s\n" $configuration
done

The quotes in red are special. When you put double-quotes around $@ or ${ARRAY[@]} it splits on array elements and not IFS.

This outputs:

Code:
Quoted does not split: -N 0 -m 0
Unquoted split:  -N
Unquoted split:  0
Unquoted split:  -m
Unquoted split:  0
Quoted does not split: -N 0 -m 1
Unquoted split:  -N
Unquoted split:  0
Unquoted split:  -m
Unquoted split:  1

Last edited by Corona688; 08-15-2014 at 12:55 PM..
This User Gave Thanks to Corona688 For This Post:
xraystorm
 

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DESCBGPTION

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OPTIONS

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COMMANDS

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