 
            
        gdu:tldr:a8201  
        The command you provided is using the gdu command with the --ignore-dirs-pattern option and the argument '${-*[abc]+}'. 
gdu is a tool used for disk usage analysis, similar to the du command. It displays summarized and sorted information about the disk space usage in a directory tree.
The --ignore-dirs-pattern option allows you to specify a regular expression pattern that matches directory names to be ignored during the disk usage analysis. In this case, the pattern is '${-*[abc]+}'.
The pattern '${-*[abc]+}' is a regular expression that matches directories whose names contain any combination of letters 'a', 'b', and 'c'. The * indicates that there can be zero or more characters before and after the pattern.
When this command is executed, it will perform a disk usage analysis using gdu, excluding directories whose names match the given regular expression pattern.