Populate array with a sed/echo combination

Question

I'm trying to rename multiple files containing dates. I want to split the date into year, month and day and then create a new filename in a directory tree like year/month-year/filename_yearmonthday.extension

I already succeeded in creating a sed expression to filter out the date and write it back into three separate variables. I would now like to insert the values into an array, where [0] is year, [1] is month and [2] is day. I tried the following statement:

#!/bin/bash for i in * do myarray=( $(echo ${i} | \ sed -n 's/.*\([0-9]\{4\}\)\([0-9]\{2\}\)\([0-9]\{2\}\).*/\1 \2 \3/p' ) ) done 

but the script complains about Syntax error: "(" unexpected (expecting "done") in the third line containing the sed-expression.

***edit The position of the date keeps changing, so I can't just split by strings.

As of now, I don't even succeed in something like this:

#!/bin/bash myarray=(1 2 3 4) echo ${myarray[@]} 

it always tells me "Syntax error: "(" unexpected (expecting "done")" in the line containing the array. ***endedit

If I do this directly in the command line, it's working. Thanks for the help.

Answer 1

If it were me, I would load up the array like this:

#!/bin/bash string="file_20160825_namegoeson" myarray[0]="${string:5:4}" myarray[1]="${string:9:2}" myarray[2]="${string:11:2}" echo "${myarray[0]}" echo "${myarray[1]}" echo "${myarray[2]}"