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envsubst

envsubst is a Go package for expanding variables in a string using ${var} syntax. Includes support for bash string replacement functions.

Documentation

Documentation can be found on GoDoc.

Supported Functions

Expression Meaning
${var} Value of $var
${#var} String length of $var
${var^} Uppercase first character of $var
${var^^} Uppercase all characters in $var
${var,} Lowercase first character of $var
${var,,} Lowercase all characters in $var
${var:n} Offset $var n characters from start
${var:n:len} Offset $var n characters with max length of len
${var#pattern} Strip shortest pattern match from start
${var##pattern} Strip longest pattern match from start
${var%pattern} Strip shortest pattern match from end
${var%%pattern} Strip longest pattern match from end
${var-default If $var is not set, evaluate expression as $default
${var:-default If $var is not set or is empty, evaluate expression as $default
${var=default If $var is not set, evaluate expression as $default
${var:=default If $var is not set or is empty, evaluate expression as $default
${var/pattern/replacement} Replace as few pattern matches as possible with replacement
${var//pattern/replacement} Replace as many pattern matches as possible with replacement
${var/#pattern/replacement} Replace pattern match with replacement from $var start
${var/%pattern/replacement} Replace pattern match with replacement from $var end

For a deeper reference, see bash-hackers or gnu pattern matching.

Unsupported Functions

  • ${var-default}
  • ${var+default}
  • ${var:?default}
  • ${var:+default}

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Go package emulates bash environment variable substitution

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