Commands

1.  apt-get
2.  cat
3.  cd
4.  chmod
5.  clear
6.  cp
7.  df
8.  du
9.  echo
10.  getconf LONG_BIT
11.  hostname
12.  ifconfig
13.  init 0
14.  ip a
15.  locate
16.  ls
17.  man/--help
18.  mkdir/rmdir
19.  mv
20.  nano/vi/jed
21.  netstat
22.  ping
23.  poweroff
24.  ps
25.  pwd
26.  rm
27.  shutdown
28.  sudo
29.  sudo halt/sudo reboot
30.  tar
31.  touch
32.  uname
33.  zip/unzip

Command Syntax

https://ss64.com/bash/

https://sevenzip.osdn.jp/chm/cmdline/syntax.htm

Switches

On the command line, a switch consists of a switch specifier, either a dash  or a forward slash , followed by the name of the switch. Switch names cannot be abbreviated.

Some switches take an argument after the switch name. No spaces or tabs are allowed within a switch specification. Switch names are not case sensitive, but arguments can be case sensitive.

Switch can be used in any place in command line.