gmssl:tldr:54f00

This command is using the gmssl utility to encrypt a file using the SMS4 algorithm. Here is a breakdown of each part of the command:

• gmssl: This is the command to invoke the gmssl utility, which is used for cryptographic operations.
• sms4: This is the specific algorithm being used for encryption, in this case, the SMS4 algorithm.
• -e: This flag is used to specify that we want to perform encryption.
• -in ${filename}: This specifies the input file to be encrypted. ${filename} is a placeholder for the actual filename, which should be replaced with the desired input file.
• -out ${filename-sms4}: This specifies the output file, where the encrypted data will be saved. ${filename-sms4} is a placeholder for the output filename, which will be the same as the input filename with "-sms4" appended to it.

So, when you run this command with a specific filename, it will encrypt the content of that file using the SMS4 algorithm and save the encrypted data in a new file with the original filename followed by "-sms4".