SHELL

envsub file

envsubst < config.txt  

# Expected output:
# server: https://gitlab.com/skofgar
# username: foo_user
# password: mymonkey

envsub file

envsubst < config.txt > confidential_config.txt

envsub file

# pipe into less
envsubst < config.txt | less

# pipe a deployment "deploy.yml" into kubectl apply
envsubst < deploy.yml | kubectl apply -f -

envsub file

# print content of configuration file
cat config.txt

# expected output:
# server: $SERVER_URL
# username: $USER_NAME
# password: $USER_PASSWORD

# load environment variables
source .env

# replace environment variables in file content
envsubst < config.txt

# expected output
# server: https://gitlab.com/skofgar
# username: foo_user
# password: mymonkey

# replace environment variables and write to new file
envsubst < config.txt > confidential_config.txt

# pipe into less
envsubst < config.txt | less

# pipe a deployment "deploy.yml" into kubectl apply
envsubst < deploy.yml | kubectl apply -f -