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If I set a variable using putenv, will other scripts be affected by this.
My understanding is that it is script specific, is that correct? if two different scripts are running at the same time on the server, will it affect the other script?
Yes, the env vars are specific to each particular invocation of a program/script. Just like each program can have its own working directory, its own stdin/stdout/stderr, etc… One script’s environment cannot affect another’s, unless they’re in a parent/child relationship.