this post was submitted on 21 Jun 2023
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Converting space separated string to array (lemmy.world)
submitted 1 year ago by Infernal_pizza@lemmy.world to c/linux@lemmy.ml
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I'm a complete noob when it comes to bash, I extracted some timestamps from an xml file using xmlstarlet however its formatted as a space separated string rather than an array. I need them as an array so that I can use them in a for loop. As far as I can tell you can't do that with xmlstarlet so I need to just convert the string.

I found this thread which says I can use IFS=' ' read -a arr <<< "$line" which works for a basic string but not the one I'm trying to use it with:

2023-06-19T00:00:00+01:00 2023-06-18T00:00:00+01:00 2023-06-17T00:00:00+01:00 2023-06-16T00:00:00+01:00 2023-06-15T00:00:00+01:00 2023-06-14T00:00:00+01:00 2023-06-13T00:00:00+01:00 2023-06-10T00:00:00+01:00 2023-06-03T00:00:00+01:00 2023-05-31T00:00:00+01:00 2023-05-27T00:00:00+01:00

If I use the command on this string it only puts the first part in the array so I get 2023-06-19T00:00:00+01:00

I also tried arr=( $line ) which is also suggested in the thread but that does the same thing. Is there another way I can try to convert this, or a way to export from xmlstarlet straight to an array?

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[–] learnbyexample@programming.dev 3 points 1 year ago

Can't reproduce your issue:

$ line='2023-06-19T00:00:00+01:00 2023-06-18T00:00:00+01:00 2023-06-17T00:00:00+01:00 2023-06-16T00:00:00+01:00 2023-06-15T00:00:00+01:00 2023-06-14T00:00:00+01:00 2023-06-13T00:00:00+01:00 2023-06-10T00:00:00+01:00 2023-06-03T00:00:00+01:00 2023-05-31T00:00:00+01:00 2023-05-27T00:00:00+01:00'
$ arr=( $line )
$ echo "${arr[4]}"
2023-06-15T00:00:00+01:00
[–] second 1 points 1 year ago

Are you sure it's not working? Does echo ${arr[@]} return the whole array? Does echo ${arr[1]} return the second value? I think just echoing $arr without specifying an index returns only the first value.