Implement some of the flags that represent output modes

-l - Long output
-C - Force multi-column output; this is the default when output is to a terminal;
-1 - (The numeric digit ``one''.) Force output to be one entry per line. This is the default when output is not to a terminal;
-m - Stream output format; list files across the page, separated by commas.
-x - The same as -C, except that the multi-column output is produced with entries sorted across, rather than down, the columns.

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