Question

I know how to echo / add text to the end of a file:

echo "{ "fruit":"apple" , "amount":"10" }" >> file.txt

My question is how to add a object to the json file below:

the file – file.txt (empty):

{
"fruit": [

]
}

Expected result:

{
"fruit": [
{ "fruit":"apple" , "amount":"10" } #object to add

]
}

Answer 1

ed is the standard text editor.

#!/bin/bash

{
ed -s file.json <<EOF
/\"fruit\": \[
a
{ "fruit":"apple" , "amount":"10" } #object to add
.
wq
EOF
} &> /dev/null

Don’t know why you want to use bash for that, though, there are much better tools around!

Done.