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lang-bash
$env_argshave no effect in variable expansion in the command string itself:env A=B echo "$A"echos nothing (or echos what$Aalready contained).A=B echo "$A"behave any differently for you?envcommand allows pre-expansion of the variable definition string, which was what the OP needs). I should have included theenv, but my point applies equally to both versions: any variables in the command itself will be expanded before the custom definitions take effect. The adjusted environment is only useful inside the program. On the other hand,A=B; echo "$A"(as two commands) will of course echoB.