write a shell script to emulate the Id command of PRIMOS
which lists files and directories.
It list files first with a header FILES and then directories
with a header DIRECTORIES.
This command has several options. The main ones are.
-file select files only
-dir select directories only
-reverse sort in reverse order
-no_header put no header on the output
-brief output the header only
-size display the size of each file
-help display Id´s syntax and options.
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