Bash JSON string into variable

Question

my idea is to put json string into variable JSON, i have a command whom takes a console login to user in AWS IAM, the comand is : aws iam create-login-profile --cli-input-json file://create-login-profile.json

in create-login-profile.json is the json following content :

{
"UserName": "roberto.viquezzz", 
"Password": "aaaaaaaaaaa", 
"PasswordResetRequired": true}

i try to write bash script whom contains json var "JSON" like following code:

JSON="{\"UserName\": \"roberto.viquezzz\",\"Password\": \"aaaaaaaaaaa\",\"PasswordResetRequired\" : true}"
aws iam create-login-profile --cli-input-json $JSON

and if i type in console ./file.sh the file execute create a console user. if it try to execute this code i get an error : Unknown options: "aaaaaaaaaaa","PasswordResetRequired", :, true}, "roberto.viquezzz","Password":

but if i execute this code from command line like :

aws iam create-login-profile --cli-input-json "{\"UserName\": \"roberto.viquezzz\",\"Password\": \"aaaaaaaaaaa\",\"PasswordResetRequired\": true}"

all is be ok , maybe whom know whats wrong ? please suggest!

ALWAYS put double quotes around the use of a variable in bash. Otherwise all nasty characters in its value (spaces, newlines, etc.) are interpreted to split the string into several arguments. — Alfe
– Alfe, Commented Oct 11, 2017 at 12:15
You don't need double-quotes unless you have some variables to expand inside. Just use single-quotes jsonVar='{ "UserName": "roberto.viquezzz", ; "Password": "aaaaaaaaaaa", ; "PasswordResetRequired": true}'; echo "${jsonVar}" — Inian
– Inian, Commented Oct 11, 2017 at 12:17
@Inian he would still need to quote it. Unless he adds the single quotes inside the value of the variable. — neuhaus
– neuhaus, Commented Oct 11, 2017 at 12:20

neuhaus · Accepted Answer · 2017-10-11 12:13:28Z

4

Put quotes around $JSON:

aws iam create-login-profile --cli-input-json "$JSON"

The quotes that are there during the assignment get consumed by the shell. You can verify this by issuing echo $JSON. By adding the quotes you will make sure that the entire string is passed to the command "aws" as a single argument.

answered Oct 11, 2017 at 12:13

neuhaus

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