convmv:tldr:818e1

The command you provided is using the convmv utility to convert the encoding of a file. Here is a breakdown of the components:

• convmv: This is the command-line program that performs the encoding conversion.
• -f ${from_encoding}: This flag specifies the encoding of the input file. ${from_encoding} needs to be replaced with the actual encoding you want to convert from. For example, if you want to convert from UTF-8, you would replace ${from_encoding} with UTF-8.
• -t ${to_encoding}: This flag specifies the encoding you want to convert the file to. ${to_encoding} needs to be replaced with the actual encoding you want to convert to. For example, if you want to convert to ISO-8859-1, you would replace ${to_encoding} with ISO-8859-1.
• --notest: This option tells convmv not to make any changes to the files but instead only displays what would be done without actually converting them. It is used for a dry run or to see what changes would be made before performing the actual conversion.
• ${input_file}: This is the file you want to convert. ${input_file} needs to be replaced with the actual path and name of the file you want to convert.

So, when you run the convmv -f ${from_encoding} -t ${to_encoding} --notest ${input_file} command, convmv will attempt to convert the encoding of the ${input_file} from ${from_encoding} to ${to_encoding} without making any actual changes to the file.