992 B
992 B
envfilesubst
envfilesubst is a variation of gettext's envsubst, with a different modus operandi.
Firstly, instead of reading the current environment it reads from file in traditional "envfile" format.
Secondly, it will read input from stdin replacing all variable references that can be matched with the envfile. If variables are not explicitly mentioned in the envfile, the references will be left untouched (instead of replacing them with an empty string).
Git
The main git repo is: https://git.netflux.io/rob/envfilesubst
It is also mirrored on GitHub: https://github.com/rfwatson/envfilesubst
Installation
go install git.netflux.io/rob/envfilesubst@latest
Usage
Given an envfile:
# myenvfile
FOO=bar
X=1
Then:
echo "FOO is $FOO and X is ${X}. I don't know $BAZ." | envfilesubst -f myenvfile
The output is:
FOO is bar and X is 1. I don't know $BAZ.