aspell:tldr:00691

This command is used to list misspelled words in a file using the aspell spell-checking utility in Linux.

Here is how the command works:

1. ${filename} is a placeholder that should be replaced with the actual name of the file you want to check for misspelled words. Make sure to provide the correct path to the file if it's not in the current directory.

2. cat is a command used to read the contents of a file and print it to the standard output. In this case, ${filename} is passed as an argument to cat, which outputs the content of the file.

3. | (pipe) is a feature in Linux that allows you to take the output of one command and use it as the input for another command. In this command, the output of cat ${filename} is piped to the next command.

4. aspell list is the second command in the pipeline. It uses the aspell list command to check the words in the input for spelling mistakes and lists any misspelled words it finds.

Overall, the command takes the content of the file specified by ${filename}, pipes it to aspell list, and then displays a list of misspelled words found in the file.