qué hacen los comandos siguientes: tree, cls, man dir, help, ls cd, ver,cmd, su,exit

TREE :.
├── Baixades -> Downloads
├── C:\nppdf32Log\debuglog.txt
├── Compartit -> /home/4eso02/UserFiles/Share
├── Desktop -> /net/home/students/4eso02/Desktop
├── Diagrama 1.dia
├── Diagrama 1.jpeg
├── Documents
│   ├── Captura1.png
│   ├── Captura2.png
│   ├── Captura3.png
│   ├── Documents -> /home/4eso02/UserFiles/Documents
│   ├── Tema 1
│   │   ├── Captura-2.png
│   │   └── Tema 1.odt
│   └── Tema 3
│       ├── Captura-1.png
│       ├── Captura-Finestra sense t\303\255tfasd<fol.png
│       └── Curriculum v\303\255tae.odt
├── Downloads
├── Escriptori 1_001.png
├── Escriptori 1_002.png
├── Grups -> /home/4eso02/UserFiles/Groups
├── Imatges -> /home/4eso02/UserFiles/Pictures
├── M\303\272sica -> /home/4eso02/UserFiles/Music
├── UserFiles
│   ├── Documents
│   │   └── Tema 3
│   │       ├── Abaco.jpg
│   │       ├── Captura.png
│   │       ├── eniac 1\302\252generaci\303\263n.jpg
│   │       ├── Eniac.jpg
│   │       ├── Escriptori 1_001.png
│   │       ├── Escriptori 1_002.png
│   │       ├── historia de la informatica
│   │       │   └── Historia de la informatica.odt
│   │       ├── Hollerithmaquina.jpg
│   │       ├── Leibniz_machine.jpg
│   │       ├── maquina-de-babbage.jpg
│   │       ├── maquinapascal.jpg
│   │       ├──  microprocesador intel 8008.jpg
│   │       ├── Pdp-11.jpg
│   │       └── pdp-1.jpg
│   ├── Groups -> /net/groups
│   ├── Music
│   ├── Pictures
│   │   ├── 327100_227960797261809_951765472_o.jpg
│   │   ├── CIMG6315.JPG
│   │   ├── CIMG6316.JPG
│   │   ├── CIMG6330.JPG
│   │   ├── CIMG6350.JPG
│   │   ├── image (1).jpg
│   │   ├── image (2).jpg
│   │   └── vdcv.jpg
│   ├── Share -> /net/share
│   └── Videos
└── V\303\255deos -> /home/4eso02/UserFiles/Videos



CLS:

 4eso02@llx-pc16:~$ cls
No se ha encontrado la orden «cls» pero hay 19 similares
cls: orden no encontrada
4eso02@llx-pc16:~$



MAN DIR :
DIR(1)                           User Commands                          DIR(1)

NAME
       dir - list directory contents

SYNOPSIS
       dir [OPTION]... [FILE]...

DESCRIPTION
       List  information  about  the FILEs (the current directory by default).
       Sort entries alphabetically if none of -cftuvSUX nor --sort.

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

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

       -A, --almost-all
              do not list implied . and ..

       --author
              with -l, print the author of each file
 Manual page dir(1) line 1








HELP:
4eso02@llx-pc16:~$ help
GNU bash, versión 4.1.5(1)-release (i486-pc-linux-gnu)
Estas órdenes del shell están definidas internamente.  Teclee `help' para
ver esta lista.
Teclee `help nombre' para saber más sobre la función `nombre'.
Use `info bash' para saber más sobre el shell en general.
Use `man -k' o `info' para saber más sobre las órdenes que no están en
esta lista.

Un asterisco (*) junto a un nombre significa que el comando está desactivado.

 job_spec [&]                            history [-c] [-d offset] [n] or hist>
 (( expression ))                        if COMMANDS; then COMMANDS; [ elif C>
 . filename [arguments]                  jobs [-lnprs] [jobspec ...] or jobs >
 :                                       kill [-s sigspec | -n signum | -sigs>
 [ arg... ]                              let arg [arg ...]
 [[ expression ]]                        local [option] name[=value] ...
 alias [-p] [name[=value] ... ]          logout [n]
 bg [job_spec ...]                       mapfile [-n count] [-O origin] [-s c>
 bind [-lpvsPVS] [-m keymap] [-f filen>  popd [-n] [+N | -N]
 break [n]                               printf [-v var] format [arguments]
 builtin [shell-builtin [arg ...]]       pushd [-n] [+N | -N | dir]
 caller [expr]                           pwd [-LP]
 case WORD in [PATTERN [| PATTERN]...)>  read [-ers] [-a array] [-d delim] [->
 cd [-L|-P] [dir]                        readarray [-n count] [-O origin] [-s>
 command [-pVv] command [arg ...]        readonly [-af] [name[=value] ...] or>
 compgen [-abcdefgjksuv] [-o option]  >  return [n]
 complete [-abcdefgjksuv] [-pr] [-DE] >  select NAME [in WORDS ... ;] do COMM>
 compopt [-o|+o option] [-DE] [name ..>  set [--abefhkmnptuvxBCHP] [-o option>
 continue [n]                            shift [n]
 coproc [NAME] command [redirections]    shopt [-pqsu] [-o] [optname ...]
 declare [-aAfFilrtux] [-p] [name[=val>  source filename [arguments]
 dirs [-clpv] [+N] [-N]                  suspend [-f]
 disown [-h] [-ar] [jobspec ...]         test [expr]
 echo [-neE] [arg ...]                   time [-p] pipeline
 enable [-a] [-dnps] [-f filename] [na>  times
 eval [arg ...]                          trap [-lp] [[arg] signal_spec ...]
 exec [-cl] [-a name] [command [argume>  true
 exit [n]                                type [-afptP] name [name ...]
 export [-fn] [name[=value] ...] or ex>  typeset [-aAfFilrtux] [-p] name[=val>
 false                                   ulimit [-SHacdefilmnpqrstuvx] [limit>
 fc [-e ename] [-lnr] [first] [last] o>  umask [-p] [-S] [mode]
 fg [job_spec]                           unalias [-a] name [name ...]
 for NAME [in WORDS ... ] ; do COMMAND>  unset [-f] [-v] [name ...]
 for (( exp1; exp2; exp3 )); do COMMAN>  until COMMANDS; do COMMANDS; done
 function name { COMMANDS ; } or name >  variables - Names and meanings of so>
 getopts optstring name [arg]            wait [id]
 hash [-lr] [-p pathname] [-dt] [name >  while COMMANDS; do COMMANDS; done
 help [-dms] [pattern ...]               { COMMANDS ; }
4eso02@llx-pc16:~$