Load environment variables from dotenv / .env file in Bash

load_dotenv.sh

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

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"

I needed this and after reading the above realized none of the solutions quite worked for my .env file on a Mac... so I modified what @shadiabuhilal into this (which I put into a file called "readenv")

# quick bash function to read .env file
# use it via:
# source readenv
# readenv
#
# or
#
# readenv <filename>
#
# modified from https://gist.github.com/mihow/9c7f559807069a03e302605691f85572
# fixed for whitespace issues, posix compliance (e.g. \t on mac means t)
#
# NOT a standalone script as when used as a standalone script, it'll read in the ENV variables into a sub-process, not the
# calling process

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

  if [ ! -f "$filePath" ]; then
    # silently be done
    # put some error / echo if you prefer non-silent errors
    return 0
  fi

#  echo "Reading $filePath"
  while read -r line; do
    if [[ "$line" =~ ^\s*#.*$ || -z "$line" ]]; then
      continue
    fi

     # Split the line into key and value. Trim whitespace on either side.
    key=$(echo "$line" | cut -d '=' -f 1 | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
    value=$(echo "$line" | cut -d '=' -f 2- | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')

    # Leaving the below here... normally this works, but if you have something like
    # FOO="  string with leading and trailing  "
    # then the leading / trailing spaces are deleted. FOO="a word", FOO='a word', and FOO=a word all generally work
    # so leave the quotes
    # 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/^[[:space:]]*//;s/[[:space:]]*$//')

    # Export the key and value as environment variables
    # echo "$key=$value"
    export "$key=$value"

  done < "$filePath"
}

Also - recommend to use [[:space:]] rather than \s or [ \t] --- on Macs, \s isn't space, and \t isn't TAB but t. Yay standardization!