loopy, loopy, loopy!

[sbc_compliant]

yesterday in class we learned about conditional shell loops:

• if then elif else fi


• case esac

plus shell variables:

• $1, $2, $3 ... $n
  command line arguments
  
• $#
  count of all command line arguments
  
• $*
  all command line arguments
  
• $?
  exit code from last command
  

Today we're learning more about quoting, i/o, and loops.

It's fun to see what I do and don't know. Some of this is review; some is brand-spankin'-new.

Fr'ex, I found I can use $(cmd) in place of `cmd`.