Load environment variables from dotenv / .env file in Bash

# Local .env
if [ -f .env ]; then
    # Load Environment Variables
    export $(cat .env | grep -v '#' | sed 's/\r$//' | awk '/=/ {print $1}' )
fi

is what I use.. <.< it allows me to comment inside of the .env file :X and handles /r proper.. hope that helps everyone <3

Here is a modified version of this code that allows for variable expansion

if [ -f .env ]; then
  export $(echo $(cat .env | sed 's/#.*//g'| xargs) | envsubst)
fi

This worked for me. Thanks

Went for:

loadEnv() {
  local envFile="${1?Missing environment file}"
  local environmentAsArray variableDeclaration
  mapfile environmentAsArray < <(
    grep --invert-match '^#' "${envFile}" \
      | grep --invert-match '^\s*$'
  ) # Uses grep to remove commented and blank lines
  for variableDeclaration in "${environmentAsArray[@]}"; do
    export "${variableDeclaration//[$'\r\n']}" # The substitution removes the line breaks
  done
}

It does not glob or swallow quotes, tested with:

WITH_QUOTES=''

# Comment
WITNESS=whatever

WITH_GLOB=*.sh

In this folder (so the glob matches the shell file):

.
├── .env
└── loadEnvTest.sh

With command:

source ./loadEnvTest.sh; loadEnv .env; echo "$WITH_QUOTES $WITH_GLOB"

Outputs:

'' *.sh

darbe habercisi

One I use (bash specific) which behaves correctly in presence of calling environment override:

. <(sed -n 's/^\([^#][^=]*\)=\(.*\)$/\1=${\1:-\2}/p' .env 2>/dev/null) || true

if [ ! -f .env ]
then
  export $(cat .env | xargs)
fi

I hate bash so much...... it took me 30 minutes to understand it should be if [ -f .env ] instead of if [ ! -f .env ]

[ ! -f .env ] || export $(sed 's/#.*//g' .env | xargs)

Update:
TEXT="abc#def" not work as expected, so just replace line begin with #.

[ ! -f .env ] || export $(grep -v '^#' .env | xargs)

@chengxuncc

using export $(grep -v '^#' .env | xargs) could not export the following,

A=10
B=$A
C=${A}

now, echo $B produces $A while it should print 10

@chengxuncc

using export $(grep -v '^#' .env | xargs) could not export the following,

A=10
B=$A
C=${A}

now, echo $B produces $A while it should print 10

@ShivKJ Of course, it will equal to export A=10 B=$A C=${A} and doesn't work like shell script. Another example is /etc/environment have same behavior and don't accept variable definition.

If you're wondering how to load a .env file with direnv: direnv already supports that :)

dotenv "testing.env"

Docs: https://direnv.net/man/direnv-stdlib.1.html

The Problem

The problem with .env files is that they're like bash, but not completely.
While in bash you'd sometimes put quotes around values:

name='value ! with > special & characters'

in .env files there are no special characters, and quotes are not supported: they're part of the value. As a result, such a string has to be escaped when imported into bash.

The Solution

This version withstands every special character in values:

set -a
source <(cat development.env | sed -e '/^#/d;/^\s*$/d' -e "s/'/'\\\''/g" -e "s/=\(.*\)/='\1'/g")
set +a

Explanation:

• -a means that every bash variable would become an environment variable
• /^#/d removes comments (strings that start with #)
• /^\s*$/d removes empty strings, including whitespace
• "s/'/'\\\''/g" replaces every single quote with '\'', which is a trick sequence in bash to produce a quote :)
• "s/=\(.*\)/='\1'/g" converts every a=b into a='b'

As a result, you are able to use special characters :)

To debug this code, replace source with cat and you'll see what this command produces.

Thank you! I have some long and unusually formatted environment variables, and this was the only solution which didn't choke on them.

~/bin/envs

set -a
source .env
set +a
exec $@

$> envs go run .

export $(grep -v '^#' .env | xargs)

Thanks so much. I love it.

export $(grep -v '^#' .env | xargs)

Hats off man

Doesn't work for me because of JWT in the .env with lots of newlines.
Had to manually vim copy paste the contents instead.

this worked for me, from @rjchicago snippet
set -o allexport; source .env; set +o allexport

Here is a modified version of this code that allows for variable expansion

if [ -f .env ]; then
  export $(echo $(cat .env | sed 's/#.*//g'| xargs) | envsubst)
fi

worked like a charm. Thanks!

FWIW If you need to just run a command with environment from an env file, this could help:

env $(cat .env|xargs) CMD

provided there are no other lines except env definitions in form of VAR=VALUE. Don't remember where I found it, but does the trick for me.

You can actually get away without xargs

env $(cat .env) <command>

export $( grep -vE "^(#.*|\s*)$" .env )

The cleanest solution I found for this was using allexport and source like this

set -o allexport
source .env set
+o allexport

This was by far the best solution here for me, removed all the complexity around certain chars, spaces comments etc. Just needed a tweak on formatting to prevent others being tripped up, should be:

set -o allexport
source .env
set +o allexport

The above worked fine for me, but thought I'd share the solution I went with: https://stackoverflow.com/a/30969768/179329 set -o allexport; source .env; set +o allexport

I like this too.

oh-my-zsh users can also activate the dotenv plugin.

source .env

works for me

wont work if you have # in your .env

Thanks for this.

Great work ! :)

• I have .env with [VAR1=xyz, VAR2=233, NPM_TOKEN=123]

• Seems that this example from @valmayaki :

if [ -f .env ]; then
  export $(echo $(cat .env | sed 's/#.*//g'| xargs) | envsubst)
fi
# always response as one liner with all the variables

• I switched to use this without xargs:

export "$(grep -vE "^(#.*|\s*)$" .env)"
# as it's responding with single value ex: 
echo $NPM_TOKEN # just print the single variable

thanks to all for great cooperation <3

The above worked fine for me, but thought I'd share the solution I went with: https://stackoverflow.com/a/30969768/179329 set -o allexport; source .env; set +o allexport

This works!

The cleanest solution I found for this was using allexport and source like this

set -o allexport
source .env set
+o allexport

This was by far the best solution here for me, removed all the complexity around certain chars, spaces comments etc. Just needed a tweak on formatting to prevent others being tripped up, should be:

set -o allexport source .env set +o allexport

Many thanks for this solution reference

That 's great, thanks

@chengxuncc

using export $(grep -v '^#' .env | xargs) could not export the following,

A=10
B=$A
C=${A}

now, echo $B produces $A while it should print 10

this read line by line, allowing to use previous set variables

  while read -r LINE; do
    if [[ $LINE == *'='* ]] && [[ $LINE != '#'* ]]; then
      ENV_VAR="$(echo $LINE | envsubst)"
      eval "declare $ENV_VAR"
    fi
  done < .env

@wffranco

@chengxuncc
using export $(grep -v '^#' .env | xargs) could not export the following,

A=10
B=$A
C=${A}

now, echo $B produces $A while it should print 10

this read line by line, allowing to use previous set variables

  while read -r LINE; do
    if [[ $LINE == *'='* ]] && [[ $LINE != '#'* ]]; then
      ENV_VAR="$(echo $LINE | envsubst)"
      eval "declare $ENV_VAR"
    fi
  done < .env

This solution is helpful!
Thanks a lot!