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dialects.md

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.env syntax dialects

name SAK EP EO UQV SQV DQV BE ML CL VE DV CS CMT
posix 0 0 0 0 0 0 0 0 0 0 0 0 0
docker 0 - - 1 - - 0 - - - 0 0 -
ruby 1 0 1 2 1 1 1 0 - 1 0 1 1
node 1 - 4 3 1 2 2 - - 2 0 0 -
python 1 0 2 2 2 3 3 0 - 3 1 0 2
php 1 0 3 4 1 4 4 1 - 4 0 0 1
go 1 0 4 2 1 1 1 - - 5 0 0 1
rust 1 0 - 4 0 4 5 - - 1 0 0 0

The posix is a subset of the POSIX shell syntax.

  • SAK: Spaces around the key
    • 0: Remove spaces before the key, spaces after the key are not allowed
    • 1: Remove spaces before and after the key
  • EP: Export prefix
    • 0: Allowed
    • -: Not allowed
  • EO: Export only
    • 0: Allowed
    • 1: Allowed, but must be set to a value
    • 2: Allowed, but treated as None
    • 3: Allowed, but treated as unset?
    • -: Not allowed
  • UQV: Unquoted value (Variable expansion is performed)
    • 0: Spaces and Metacharacters are not allowed
    • 1: Leave spaces as it is (Single and double quote values are not supported)
    • 2: Remove spaces around it
    • 3: Remove spaces around it, but leave comments as is
    • 4: Remove spaces around it, and no spaces allowed
  • SQV: Single quoted value
    • 0: Single quotes cannot be used in it
    • 1: Single quotes can be used in it
    • 2: Single quotes can be used in it, but need to be escaped
  • DQV: Double quoted value
    • 0: Need to escape when used within it: " ` \ $
    • 1: Need to escape when used within it: \
    • 2: Need to escape when used within it: $
    • 3: Need to escape when used within it: "
    • 4: Need to escape when used within it: " \ $
  • BE: Backslash escape (Double quoted value only)
    • 0: None
    • 1: \n, \r (Backslashes of other characters will disappear)
    • 2: \n (Backslashes of other characters will remain)
    • 3: \a,\b, \f, \n, \r, \t, \v (Backslashes of other characters will remain)
    • 4: \f, \n, \r, \t, \v (Backslashes of other characters will cause an error)
    • 5: \n (Backslashes of other characters will cause an error)
  • ML: Multiline within quotes
    • 0: Allowed (single and double quotes)
    • 1: Allowed (double quotes only)
    • -: Not allowed
  • CL: Continuation line with backslash
    • 0: Double quoted value only
    • -: Not allowed
  • VE: Variable expansion
    • 0: Brace only (${VAR}), double quotes
    • 1: Brace and bare (${VAR}, $VAR), single and double quotes
    • 2: Brace and bare (${VAR}, $VAR), unquotes and single and double quotes
    • 3: Brace only (${VAR}), unquotes and single and double quotes
    • 4: Brace only (${VAR}), unquotes and double quotes
    • 5: Brace and bare (${VAR}, $VAR), unquotes and double quotes
    • -: Not allowed
  • DV: Default value (${VAR-default}, ${VAR:-default})
    • 0: Not allowed
    • 1: Allowed (${VAR:-default} only)
  • CS: Command Substitution
    • 0: Not allowed
    • 1: Allowed
  • CMT: Comments at end of line
    • 0: Allowed and requires spaces before #
    • 1: Allowed and no requires spaces before #
    • 2: Allowed and no requires spaces before # except unquoted value
    • -: Not allowed