I have a python list as a string with the following structure:
var="["127.0.0.1:14550","127.0.0.1:14551"]"
I would like to turn the string into a bash array to be able to loop through it with bash:
for ip in ${var[@]}; do
something
done
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1Welcome to Stack Overflow. SO is a question and answer page for professional and enthusiast programmers. Please add your own code to your question. You are expected to show at least the amount of research you have put into solving this question yourself.0stone0– 0stone02020-12-10 16:25:49 +00:00Commented Dec 10, 2020 at 16:25
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1I don't understand the question. How do you expect a python variable to be used in a bash script? The two contexts are completely separate.John Gordon– John Gordon2020-12-10 16:28:14 +00:00Commented Dec 10, 2020 at 16:28
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1That list resembles JSON, have you tried parsing it using a JSON parser? Such as jqoguz ismail– oguz ismail2020-12-10 16:34:12 +00:00Commented Dec 10, 2020 at 16:34
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2 Answers
Use Perl to parse the Python output, like so (note single quotes around the string, which contains double quotes inside):
array=( $( echo '["127.0.0.1:14550","127.0.0.1:14551"]' | perl -F'[^\d.:]' -lane 'print for grep /./, @F;' ) )
echo ${array[*]}
Output:
127.0.0.1:14550 127.0.0.1:14551
Alternatively, use jq as in the answer by 0stone0, or pipe its output through xargs, which removes quotes, like so:
array=( $( echo '["127.0.0.1:14550","127.0.0.1:14551"]' | jq -c '.[]' | xargs ) )
The Perl one-liner uses these command line flags:
-e : Tells Perl to look for code in-line, instead of in a file.
-n : Loop over the input one line at a time, assigning it to $_ by default.
-l : Strip the input line separator ("\n" on *NIX by default) before executing the code in-line, and append it when printing.
-a : Split $_ into array @F on whitespace or on the regex specified in -F option.
-F'[^\d.:]' : Split into @F on any chars other than digit, period, or colon, rather than on whitespace.
print for grep /./, @F; : take the line split into array of strings @F, select with grep only non-empty strings, print one per line.
SEE ALSO:
perldoc perlrun: how to execute the Perl interpreter: command line switches
