środa, 13 grudnia 2017

bash - how to concatenate array with given delimiter

Let's declare array
 a=(aa bb cc) 
Now we can display the content with
$echo ${a[@]}
aa bb cc
First, give some naive solutions a try
$for el in ${a[@]}; do echo -n ,$el; done
$printf ",%s" ${a[@]}
Both work well, right? Hmm.. almost.

The last thing to do is get rid of the first comma

$for ab in ${a[@]}; do echo -n ,${ab}; done | cut -c2-

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