I changed PS1 and now ....

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apropos

apropos(1)						      General Commands Manual							apropos(1)

NAME

       apropos - Locates reference pages by keyword

SYNOPSIS

       apropos keyword...

       The apropos command shows which reference pages contain instances of any of the given keywords in their purpose lines.

OPTIONS

       Specifies the word(s) for which apropos should search.

DESCRIPTION

       In  looking  for  keywords,  apropos considers each word separately and ignores the case of letters. Words that are part of other words are
       also considered; thus, when looking for the word compile, apropos will also find all instances of compiler.

       If the output of the apropos command begins with a name and reference section number, you can enter man section name. For example,  if  the
       output of the apropos command is make(1u), you can enter man 1u make to obtain the reference page on System V version of the make command.

       The apropos command works just like the man command with the -k option.

EXAMPLES

       To find reference pages with the keyword password in the purpose line, enter: apropos password

FILES

       Keyword database.

SEE ALSO

       Commands:  man(1), whatis(1), catman(8)

																	apropos(1)

UNIX for Dummies Questions & Answers