Unable to print python array in shell script loop.


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# 1  
Unable to print python array in shell script loop.

I am unable to loop print a python string array in my unix shell script:

Code:
~/readarr.sh '{{ myarr }}'

more readarr.sh

echo "Parameter 1:"$1
MYARRAY= $1
IFS=
MYARRAY=`python <<< "print ' '.join($MYARRAY)"`

for a in "$MYARRAY"; do
  echo "Printing Array: $a"
done

Quote:
Current Output:
Parameter 1: [u/tmp/file.js, u/var/test.txt, u/tmp/llo.rft]
Quote:
Expected Output:
Parameter 1: [u/tmp/file.js, u/var/test.txt, u/tmp/llo.rft]
Printing Array: /tmp/file.js
Printing Array: /var/test.txt
Printing Array: /tmp/llo.rft
Can you suggest what is the issue with my code ?

I wish to run the shell script on IBM AIX machine non-bash shell.
# 2  
start with:
Code:
echo "Parameter 1:"$1
MYARRAY=($1)
IFS=
MYARRAY=`python <<< "print ''.join( \"${MYARRAY}\" )"`

for a in "${MYARRAY[@]}"; do
   echo "Printing Array: $a"
done

This User Gave Thanks to rdrtx1 For This Post:
# 3  
Quote:
Originally Posted by mohtashims

Can you suggest what is the issue with my code ?

I wish to run the shell script on IBM AIX machine non-bash shell.
But you are demonstrating bash constructs, particularly the string redirection, <<<.


You also need to quote each element of the python array:
Code:
$ python <<< "print ' '.join(['u/tmp/file.js', 'u/var/test.txt', 'u/tmp/llo.rft'])"
u/tmp/file.js u/var/test.txt u/tmp/llo.rft

Do you really need to pass this python-style array into your script? Can you pass just a comma-delimited string?
Alternatively:
Code:
printf "Parameter 1: %s\n" "$1"
MYARRAY=`echo "$1" | sed 's/^\[//;s\]$//'`
oldIFS="$IFS"
IFS=,
for a in $MYARRAY
do printf "Printing Array: %s\n" "$a"
done
IFS="$oldIFS"

Assuming AIX has the printf utility.


Andrew
# 4  
Quote:
Originally Posted by apmcd47
But you are demonstrating bash constructs, particularly the string redirection, <<<.


You also need to quote each element of the python array:
Code:
$ python <<< "print ' '.join(['u/tmp/file.js', 'u/var/test.txt', 'u/tmp/llo.rft'])"
u/tmp/file.js u/var/test.txt u/tmp/llo.rft

Do you really need to pass this python-style array into your script? Can you pass just a comma-delimited string?
@Andrew unfortunately the python string array is what is constructed by Ansible's loop / with _items by defaults and then it has to be passed to the shell script for processing.

I do not know if there is an easy way to convert the python string array to something else that suits our requirement inside of the ansible YML.
# 5  
Quote:
Originally Posted by rdrtx1
start with:
Code:
echo "Parameter 1:"$1
MYARRAY=($1)
IFS=
MYARRAY=`python <<< "print ''.join( \"${MYARRAY}\" )"`

for a in "${MYARRAY[@]}"; do
   echo "Printing Array: $a"
done

This suggestion does not work.

Below is the incorrect output recieved with this code:

Quote:
Printing Array: [u/tmp/file.js,
Printing Array: u/var/test.txt,
Printing Array: u/tmp/llo.rft]
# 6  
Quote:
Originally Posted by mohtashims
This suggestion does not work. .....
Why not run the loop in python instead of putting the script in a "shell script" loop?

My guest is that the python script is already written and you want a "wrapper" to run the python script in a loop.

Maybe I am wrong?

Why not copy the python script and modify the original script do perform as you wish?
# 7  
Quote:
Originally Posted by apmcd47
But you are demonstrating bash constructs, particularly the string redirection, <<<.


You also need to quote each element of the python array:
Code:
$ python <<< "print ' '.join(['u/tmp/file.js', 'u/var/test.txt', 'u/tmp/llo.rft'])"
u/tmp/file.js u/var/test.txt u/tmp/llo.rft

Do you really need to pass this python-style array into your script? Can you pass just a comma-delimited string?
Alternatively:
Code:
printf "Parameter 1: %s\n" "$1"
MYARRAY=`echo "$1" | sed 's/^\[//;s\]$//'`
oldIFS="$IFS"
IFS=,
for a in $MYARRAY
do printf "Printing Array: %s\n" "$a"
done
IFS="$oldIFS"

Assuming AIX has the printf utility.


Andrew
The suggestion does not work and does not print anything.

As far as putting single quotes around parameters fine however, the appended 'u' is put by ansible's python array and we do not have control over it. Hence, with single quotes our array will not look as you shared but look something like below:

Quote:
[u'/tmp/file.js', u'/var/test.txt', u'/tmp/llo.rft']
Please suggest.
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