Little bash scripting learning

Variables:

• $? -- the exit status of last command
• 0 = success
• fail otherwise
• $# -- No. of arguments
• $@  -- All the arguments

Powershell reference

http://ss64.com/ps/

Bash scripting

Start doing a bit bash scripting now....

this is some thing that fairly simple but took me a few minutes to figure out how...

• You can't use alias by default unless you turn on some kind of options
• to run a variable as a command, there are three commands that you can use
• eval, exec, source 
• Variable should be upper case!