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I.1.2.9 process-file-side-effects—a variable

Variable: process-file

This variable indicates whether a call of process-file changes remote files.

By default, this variable is always set to ‘t’, meaning that a call of process-file could potentially change any file on a remote host. When set to ‘nil’, a file handler could optimize its behavior with respect to remote file attribute caching. You should only ever change this variable with a let-binding; never with ‘setq’.