Komenda man wyświetla stronę podręcznika (manuala) dla poleceń w Linux

$ man top
LS(1)                                        User Commands                                       LS(1)

       ls - list directory contents

       ls [OPTION]... [FILE]...

       List  information  about the FILEs (the current directory by default).  Sort entries alphabeti‐
       cally if none of -cftuvSUX nor --sort is specified.

       Mandatory arguments to long options are mandatory for short options too.

       -a, --all
              do not ignore entries starting with .


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