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@mihow
Last active May 16, 2024 20:51
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Load environment variables from dotenv / .env file in Bash
if [ ! -f .env ]
then
export $(cat .env | xargs)
fi
@MansourM
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MansourM commented Nov 24, 2023

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 was working the best for me but this still has 2 problems

  1. code breaks if the value has () characters inside it
  2. can not be used inside a function

here is my solution:

read_env() {
  local filename="${1:-.env}"

  if [ ! -f "$filename" ]; then
    echo "missing ${filename} file"
    exit 1
  fi

  echo "reading .env file..."
  while read -r LINE; do
    if [[ $LINE != '#'* ]] && [[ $LINE == *'='* ]]; then
      export "$LINE"
    fi
  done < "$filename"
}

UPDATED VERSION BELOW

@emilwojcik93
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emilwojcik93 commented Jan 7, 2024

Hi, here is mine solution to read vars from /etc/environemnt file which I used in /etc/profile or /etc/bash.bashrc

oneliner for easier validation if line exists in file
(I removed single quotes ' from conditions, so it could be easier parsed by grep)

while read -r LINE; do [[ ${LINE} =~ ^# || ${LINE} =~ ^PATH= || ! ${LINE} == *=* || ${LINE} =~ ^[0-9] || ${LINE} =~ ^[^a-zA-Z_] ]] || export "${LINE}"; done < "/etc/environment"

or formatad syntax:

while read -r LINE; do 
  if [[ ${LINE} =~ ^# || ${LINE} =~ ^PATH= || ! ${LINE} == *=* || ${LINE} =~ ^[0-9] || ${LINE} =~ ^[^a-zA-Z_] ]]; then
    continue
  else
    export "${LINE}"
  fi
done < "/etc/environment"

@shadiabuhilal
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shadiabuhilal commented Feb 2, 2024

Hi,

Here is my solution to read vars from .env file and ignoring # and cleaning values from ' and ".

https://gist.github.com/shadiabuhilal/220aa09f9bb83caed93a1f87401fcc60

dot-env.sh File:

#!/bin/bash

# Specify the path to your .env file
ENV_FILE=".env"

# Check if the .env file exists
if [ -f "$ENV_FILE" ]; then

  echo "[INFO]: Reading $ENV_FILE file."

  # Read the .env file line by line
  while IFS= read -r line; do
    # Skip comments and empty lines
    if [[ "$line" =~ ^\s*#.*$ || -z "$line" ]]; then
      continue
    fi

    # Split the line into key and value
    key=$(echo "$line" | cut -d '=' -f 1)
    value=$(echo "$line" | cut -d '=' -f 2-)

    # Remove single quotes, double quotes, and leading/trailing spaces from the value
    value=$(echo "$value" | sed -e "s/^'//" -e "s/'$//" -e 's/^"//' -e 's/"$//' -e 's/^[ \t]*//;s/[ \t]*$//')

    # Export the key and value as environment variables
    export "$key=$value"
  done < "$ENV_FILE"
  echo "[DONE]: Reading $ENV_FILE file."
else
  echo "[ERROR]: $ENV_FILE not found."
fi

Enjoy :)

@cihadturhan
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Thanks!
One-liner while running command a script (such as pnpm script)
I added parentheses not to pollute global environment vars. Not sure if it's needed though.

(export $(cat .env | xargs) && pnpm compile)

@rrakso
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rrakso commented Feb 28, 2024

source .env

works for me

wont work if you have # in your .env

@abhidp it seems, that it works well - even with comments in .env! :D (cc: @muthugit)

@MansourM
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MansourM commented Mar 10, 2024

this is the final version that im using, seems to work for all situations

read_env() {
  local filePath="${1:-.env}"

  if [ ! -f "$filePath" ]; then
    echo "missing ${filePath}"
    exit 1
  fi

  echo "Reading $filePath"
  while read -r LINE; do
    # Remove leading and trailing whitespaces, and carriage return
    CLEANED_LINE=$(echo "$LINE" | awk '{$1=$1};1' | tr -d '\r')

    if [[ $CLEANED_LINE != '#'* ]] && [[ $CLEANED_LINE == *'='* ]]; then
      export "$CLEANED_LINE"
    fi
  done < "$filePath"
}

@benoit-cty
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Thanks @MansourM !

@xczdenis
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this is the final version that im using, seems to work for all situations

read_env() {
  local filePath="${1:-.env}"

  if [ ! -f "$filePath" ]; then
    echo "missing ${filePath}"
    exit 1
  fi

  log "Reading $filePath"
  while read -r LINE; do
    # Remove leading and trailing whitespaces, and carriage return
    CLEANED_LINE=$(echo "$LINE" | awk '{$1=$1};1' | tr -d '\r')

    if [[ $CLEANED_LINE != '#'* ]] && [[ $CLEANED_LINE == *'='* ]]; then
      export "$CLEANED_LINE"
    fi
  done < "$filePath"
}

Looks great, but it doesn't work if the .env file contains only 1 row (just one without br)

@MansourM
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MansourM commented Apr 27, 2024

Looks great, but it doesn't work if the .env file contains only 1 row (just one without br)

how do you use it?
you get any errors?
btw u need to comment or remove this line as you don't have the log function
log "Reading $filePath"

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