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Step 1

Come Out of Your Shell

What is a shell?

Windows has a shell.

Two, in fact:

  • CMD.EXE
  • PowerShell.EXE

. . .

Technically, Windows Explorer is a "shell" for the GUI environment.

"UNIX" has lots of shells

  • sh - Bourne shell
    • ash - Almquist shell
      • dash - Debian Almquist shell
    • bash - "Bourne-again" shell
    • ksh - Korn shell
    • zsh - Z shell
  • csh - C shell
  • and many more!

Linux default shell

Typically bash

Comparing CMD.EXE and bash

set in bash

~ $ set
BASH=/bin/bash
BASHOPTS=checkwinsize:cmdhist:complete_fullquote:...
BASH_ALIASES=()
BASH_ARGC=()
BASH_ARGV=()
BASH_CMDS=()
...and so on...

set in CMD.EXE

C:\Users\myuser>set
ALLUSERSPROFILE=C:\ProgramData
APPDATA=C:\Users\myuser\AppData\Roaming
CommonProgramFiles=C:\Program Files\Common Files
CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
CommonProgramW6432=C:\Program Files\Common Files
COMPUTERNAME=JLEHMER650
...and so on...

echo

bash:

~ $ echo $HOME
/home/myuser

CMD.EXE:

C:\> echo %homepath%
\Users\myuser

Similar, but different

  • $variable (bash) vs. %variable% (CMD.EXE)
  • bash is case-sensitive, CMD.EXE is not

Product of your environment

Setting variables

~ $ FOO=myval /home/myuser/myscript
~ $ CURRDATE=`date`
~ $ echo $CURRDATE
Wed Oct 28 11:43:38 CDT 2015

A path! A path!

$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:...

Getting lazy

  • Tab expansion
  • Command history