Re: [Help-bash] Help With School Assignment, Learning Bash Scripts

[Greg Wooledge]

On Wed, Nov 05, 2014 at 07:46:41PM -0800, Eduardo A. Bustamante López wrote:
> I don't want to make this explanation long, so I'll just give you
> some links you can read on why I said that:
> 
> - http://mywiki.wooledge.org/BashGuide/TestsAndConditionals#Conditional_Blocks
> - http://wiki.bash-hackers.org/syntax/ccmd/if_clause
> - http://mywiki.wooledge.org/glob#extglob 

I'd add one more:

http://mywiki.wooledge.org/BashFAQ/054 -- How can I tell whether a variable
contains a valid number?