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strip-nondeterminism:tldr:a4029
This command invokes the utility program "strip-nondeterminism" with two arguments: "--timestamp" and "${unix_timestamp}". The command is also followed by the argument "${filename}".
The "strip-nondeterminism" program is used to remove non-deterministic information from files. Non-deterministic information can include things like timestamps, random numbers, or other data that can cause files to have different checksums or signatures even if their content is the same.
In this specific command, the "--timestamp" option is used to specify that the command should modify the timestamp of the file being processed. "${unix_timestamp}" is a placeholder for the actual UNIX timestamp value that should be used. This value is typically provided by the user or by another script or program.
Finally, "${filename}" is another placeholder that should be replaced with the actual name of the file that needs to have its non-deterministic information stripped.
Overall, this command is trying to remove non-deterministic information from the specified file(s) while setting a specific UNIX timestamp as the file's timestamp.