Per-process means a single invocation of a program (or script). In other words, once you change it, it will affect files created after that point by that program, and (possibly) child processes created by that program. It will not affect any other programs or users, nor will it be remembered after the program ends.

HTH

In reply to Re (3): Does changing 'unmask' change the system's default value? by VSarkiss
in thread Does changing 'umask' change the system's default value? by newbie00

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