CODEWITHSUNDEEP
bash
kursus
kursus

Reputation: 1404

Using the right quotes for exported variables inside a sudo shell envsubst command

I have this bash code that replace some variables in a template text file and write the result somewhere. This works : 

#!/usr/bin/env bash
PROJECTFOLDER=$1
USER=$2

export PROJECTFOLDER USER
CONFIGVARS='$PROJECTFOLDER:$USER'

envsubst "$CONFIGVARS" < template.conf > /home/me/config.inc.php

and a template.conf like so : 

<h1>${USER}</h1>
<h2>${PROJECTFOLDER}</h2>

When called with : 

./script foo bar

This gives : 

<h1>foo</h1>
<h2>bar</h2>

But if I want to save the output to a folder with sudo or root it does not work, as seen here.

What I should do is running the command in a sudo shell (I don't want to use the tee or dd method to keep it simple). 

sudo sh -c 'envsubst "$CONFIGVARS" < template.conf > /etc/config.inc.php'

But whatever combination of quotes ands brackets I try, it gives either 

<h1>${USER}</h1>
<h2>${PROJECTFOLDER}</h2>

or nothing : 

<h1></h1>
<h2></h2>

Solution Thanks to l0b0 : 

envsubst "$CONFIGVARS" < template.conf | sudo tee /etc/config.inc.php

Upvotes: 1

Views: 891

Answers (1)

l0b0
l0b0

Reputation: 58848

What you'll want to do is pipe the command to sudo tee /home/me/config.inc.php.

Upvotes: 3

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