minisign:tldr:f0827
The command you provided is using the "minisign" program with various options and arguments.
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"minisign": This is the name of the program/command you are executing.
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"-Sm": This option specifies that you want to sign a file using an existing secret key.
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"${filename}": This is the name of the file that you want to sign. Replace "${filename}" with the actual filename or path of the file you want to sign.
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"-c": This option is used to provide an untrusted comment for the signature. "${Untrusted comment}" is a placeholder for the comment you want to include. Replace it with your desired untrusted comment.
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"-t": This option allows you to provide a trusted comment for the signature. "${Trusted comment}" is a placeholder for the comment you want to include. Replace it with your desired trusted comment.
To summarize, the command is using minisign to sign a file with a secret key, and it adds both untrusted and trusted comments to the signature.