Replace Environment variable with bash

Question

export const environment = {
  production: true,
  firebase: {
    apiKey: "APIKEY",
    authDomain: "AUTHDOMAIN",
    databaseURL: "DATABASEURL",
    projectId: "PROJECTID",
    storageBucket: "STORAGEBUCKET",
    messagingSenderId: "MESSAGINGSENDERID"
  },
  functionURL:"FUNCTIONSURL",

};

I have this type of file now I want to replace all variables (APIKEY, AUTHDOMAIN,..) using bash, please provide some generic solution!

sed  -i 's/($APIKEY)/('"$Master_APIKEY"')/g'

Already use for every variable in file.

Not clear, could you please mention more details? Like which file you want to edit? from where variable values should be picked up? — RavinderSingh13, Aug 18 '18 at 06:12
how is python related in this question? seems like javascript to me — Arghya Saha, Aug 18 '18 at 06:13
@RavinderSingh13 file already given and variable value should be anything — soheshdoshi, Aug 18 '18 at 06:20
@soheshdoshi if you know what you are replacing exactly then why not just do a `sed "s/$APIKEY/$Master\_$APIKEY"` — Inder, Aug 18 '18 at 06:57
This uses `sed`, which has nothing to do with `bash`. Do you require `bash` code to do this? — cdarke, Aug 18 '18 at 07:06
@soheshdoshi: See: [Difference between single and double quotes in bash](http://stackoverflow.com/q/6697753/3776858) — Cyrus, Aug 18 '18 at 09:23
Do you have a variabele called `APIKEY` with the key to be replaced (like `apiKey`), and the new value that should replace the old one in the variable `Master_APIKEY`? Perhaps start writing your shell varables in lowercase now. — Walter A, Aug 18 '18 at 22:27

builder-7000 · Accepted Answer · 2018-08-20T05:19:41.840

To prepend every variable with the string $Master_ use:

sed 's/\(.*: "\)\(.*\)"/\1$Master_\2"/g' inputfile

this command works like this:

$.*: "$: match everything until the string : " and capture in group 1
$.*$": match everything before the last " and capture in group 2
\1$Master_\2": replace with contents of group 1, followed by $Master_ and contents of group 2.

output:

export const environment = {                                                
  production: true,                                                         
  firebase: {                                                               
    apiKey: "$Master_APIKEY",                                               
    authDomain: "$Master_AUTHDOMAIN",                                       
    databaseURL: "$Master_DATABASEURL",                                     
    projectId: "$Master_PROJECTID",                                         
    storageBucket: "$Master_STORAGEBUCKET",                                 
    messagingSenderId: "$Master_MESSAGINGSENDERID"                          
  },                                                                        
  functionURL:"FUNCTIONSURL",                                               

};

you can include the -i.bak flag to replace the original file and make a backup file.

Wif you want to replace `FUNCTIONSURL` too then replace `$.*: "$` with `$.*: *"$` in the regex in order to match zero or more spaces after the colon. — builder-7000, Aug 22 '18 at 16:39

score 2 · Answer 2 · edited Aug 18 '18 at 08:07

2

Here is an example for what you are trying to acheive:

P.S. you don't need to cat and all, you can directly use sed -i on the file, this is just to demonstrate a single line code where we are inserting a variable on the given pattern:

a=REPLACEMENT ;cat inputfile | sed "s/\"\(.*\)\"/\""$a"_\1\"/g"

the output from the input file provided by you :

export const environment = {
  production: true,
  firebase: {
    apiKey: "REPLACEMENT_APIKEY",
    authDomain: "REPLACEMENT_AUTHDOMAIN",
    databaseURL: "REPLACEMENT_DATABASEURL",
    projectId: "REPLACEMENT_PROJECTID",
    storageBucket: "REPLACEMENT_STORAGEBUCKET",
    messagingSenderId: "REPLACEMENT_MESSAGINGSENDERID"
  },
  functionURL:"REPLACEMENT_FUNCTIONSURL",

};

edited Aug 18 '18 at 08:07

tamara

27
5

answered Aug 18 '18 at 07:23

Inder

3,711
9
27
42

It's give output like apikey : "REPLACEMENT_xyzv" time for replacing placeholder with environment variable – soheshdoshi Aug 18 '18 at 09:15
1

@sheshdoshi can u please share more details about the variable and your implementation?? – Inder Aug 18 '18 at 10:47

Replace Environment variable with bash

2 Answers2