RosettaCodeData/Task/Environment-variables/Lasso/environment-variables.lasso

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#!/usr/bin/lasso9
define getenv(sysvar::string) => {
local(regexp = regexp(
-find = `(?m)^` + #sysvar + `=(.*?)$`,
-input = sys_environ -> join('\n'),
-ignorecase
))
return #regexp ->find ? #regexp -> matchString(1)
}
stdoutnl(getenv('HOME'))
stdoutnl(getenv('PATH'))
stdoutnl(getenv('USER'))
stdoutnl(getenv('WHAT'))