Convert String to an Array using shell scripting in JSON file.


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Top Forums UNIX for Beginners Questions & Answers Convert String to an Array using shell scripting in JSON file.
# 8  
The normal practice would be to redirect to a temporary file and then move the temp file over the original.

Code:
jq -c '.....' infile > /tmp/jqtemp.$$ && mv -f /tmp/jqtemp.$$ infile

This User Gave Thanks to Chubler_XL For This Post:
# 9  
There are a couple of things I'm a little unhappy with in my proposed solution and I'd like to update to a more robust version.

Firstly if the JSON structure contains array of objects decend() stops drilling down at the array.
Second the IP address RE is inaccurate and and gets false positives eg 999.999.999.999.

These issues are illustrated by the following example:
Code:
{
  "non-ip" : "999.2.3.1",
  "Adaptors" : [
     {"device" : "ip01" , "gateway" : "192.168.0.1" , "net_mask" : "255.255.0.0" },
     {"device": "ip12", "network_ip_v4_address":["10.38.61.1","10.38.32.1"]}
  ]
}

I have tightened down IP address RE and enhanced the decend() function it now takes a parent object parameter and will not apply f to string objects parented by arrays:
Code:
jq -c '
def decend(p;f):
  . as $in
  | if type == "object" then
    reduce keys_unsorted[] as $key
( {}; . + { ($key) : ($in[$key] | decend($in;f)) } ) | f
elif type == "array" then map( decend($in;f) ) | f
elif (p | type) == "array" then .
else f
end;
decend(.;
   if type == "string" and
       test(
           "^(" +
           "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" +
           "\\.){3}" +
           "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" +
           "$")
   then [ . ] else . end)' infile

The example above is not converted correctly:
Code:
{
  "non-ip" : "999.2.3.1",
  "Adaptors" : [
      {"device" : "ip01", "gateway" : ["192.168.0.1"], "net_mask" : ["255.255.0.0"]},
      {"device" : "ip12", "network_ip_v4_address" : ["10.38.61.1", "10.38.32.1"]}
  ]
}

This User Gave Thanks to Chubler_XL For This Post:
# 10  
Thats Great!! I really appreciate it. Thank you so much.. you made my day as I was struggling from quite few days.

This piece of code didn't work for me. Anyways this is not required in my case I believe. --- Firstly if the JSON structure contains array of objects decend() stops drilling down at the array.
Code:
def decend(p;f):
  . as $in
  | if type == "object" then
    reduce keys_unsorted[] as $key
( {}; . + { ($key) : ($in[$key] | decend($in;f)) } ) | f
elif type == "array" then map( decend($in;f) ) | f
elif (p | type) == "array" then .
else f
end;


This piece of code, I mean the Regex is working --- Second the IP address RE is inaccurate and and gets false positives eg 999.999.999.999.
Code:
decend(.;
   if type == "string" and
       test(
           "^(" +
           "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" +
           "\\.){3}" +
           "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" +
           "$")
   then [ . ] else . end)

Moderator's Comments:
Mod Comment
Use code tags as per our rules please.

Last edited by Peasant; 11-29-2019 at 02:11 AM..
# 11  
Any reason why the jq code in the shell script is not executing when run from crontab. The shell code other than jq is executing properly without any issue. How to make it working? anything to do with bashprofile & how to do it? Thanks!
# 12  
My first guess would be the PATH variable doesn't contain the folder where jq is stored. I'd try specifying a PATH in your script:

Find where jq is installed eg:
Code:
$ type jq
jq is hashed (/usr/bin/jq)

Now specify a sane PATH at the top of your cron script:
Code:
#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

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