You recently uploaded a new software package to your Junos device and you want to ensure that the file uploaded successfully by verifying the file size. In this scenario, which command should you use?

`file show encoding` displays the encoding of a text file, which is not relevant for verifying file size or upload success of a software package.

`file compare` compares the content of two files, which is not the primary method for checking if a single file uploaded successfully by size.

`file checksum sha1` calculates the SHA1 checksum of a file, used for integrity verification, but not directly for confirming file size or general upload success.

The `file list detail` command displays detailed information about files and directories, including file sizes, permissions, ownership, and modification times. This command is specifically useful for verifying the presence and size of an uploaded software package, which helps confirm successful transfer.