Section04>도움말 퀴즈 답안

Q1>

# man whoami

 

NAME
       whoami - print effective userid

SYNOPSIS
       whoami [OPTION]...

DESCRIPTION
       Print the user name associated with the current effective user ID.  Same as id -un.

       --help display this help and exit

       --version
              output version information and exit

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report whoami translation bugs to <http://translationproject.org/team/>

AUTHOR
       Written by Richard Mlynarik.

COPYRIGHT
       Copyright ⓒ 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The full documentation for whoami is maintained as a Texinfo manual.  If the info and whoami programs are properly installed at your site, the command

              info coreutils 'whoami invocation'

       should give you access to the complete manual.

 

# whatis whoami

 

whoami (1)           - print effective userid

 

 

Q2>

# whoami

 

Q3>

# man who

 

NAME
       who - show who is logged on

SYNOPSIS
       who [OPTION]... [ FILE | ARG1 ARG2 ]

DESCRIPTION
       Print information about users who are currently logged in.

       -a, --all
              same as -b -d --login -p -r -t -T -u

       -b, --boot
              time of last system boot

       -d, --dead
              print dead processes

       -H, --heading
              print line of column headings

       -l, --login
              print system login processes

       --lookup
              attempt to canonicalize hostnames via DNS

       -m     only hostname and user associated with stdin

       -p, --process
              print active processes spawned by init

       -q, --count
              all login names and number of users logged on

       -r, --runlevel
              print current runlevel

       -s, --short
              print only name, line, and time (default)

       -t, --time
                     print current runlevel

       -s, --short
              print only name, line, and time (default)

       -t, --time
              print last system clock change

       -T, -w, --mesg
              add user's message status as +, - or ?

       -u, --users
              list users logged in

       --message
              same as -T

       --writable
              same as -T

       --help display this help and exit

       --version
              output version information and exit

       If FILE is not specified, use /var/run/utmp.  /var/log/wtmp as FILE is common.  If ARG1 ARG2 given, -m presumed: 'am i' or 'mom likes' are usual.

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report who translation bugs to <http://translationproject.org/team/>

AUTHOR
       Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.

COPYRIGHT
       Copyright © 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The full documentation for who is maintained as a Texinfo manual.  If the info and who programs are properly installed at your site, the command

              info coreutils 'who invocation'

       should give you access to the complete manual.

 

Q4>

# who

 

Q5>

# type echo
echo is a shell builtin

# whereis echo
echo: /usr/bin/echo /usr/share/man/man1/echo.1.gz /usr/share/man/man1p/echo.1p.gz

# whatis echo
echo (1)             - display a line of text
echo (1p)            - write arguments to standard output

 

Q6>

# type date
date is /usr/bin/date

# whereis date
date: /usr/bin/date /usr/share/man/man1/date.1.gz /usr/share/man/man1p/date.1p.gz

# whatis date
date (1)             - print or set the system date and time
date (1p)            - write the date and time