Shell Functions and Path Variables, Part 1

Shell utilities can simplify the maintenance of your path variables.


Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

user entering a variable name can also be solved

Mohamed Mustafa Z's picture

I was having a problem when a user enters a input
i wanted to store the value of the variable into another on the fly. if the input was not a variable it shd get the value as is. I.E
echo "Enter oracle path:"
read $VAR

here if the user enters $ORACLE_HOME i wanted the var to have the value of $ORACLE_HOME and if he enters /oracle/binxyz i wanted as it is
that was solved by:
eval VAR=\"$VAR\"

Thanks for the posting :)

testoptions 'problem'

joe Davison's picture

Nice example.

I was nasty, though, I tried: testoptions -a -b "a b" -c

It took a while to figure out what the error message meant -- the eval sees a form like
opt_b=a b
and tries to find a command 'b' to execute with $opt_b == 'a'...

The fix was a couple of escaped quotes in the eval and in the final echo:
eval opt_$argname=\"$OPTARG\" # set option name
echo opt_b=\"$opt_b\"


Free Dummies Books
Continuous Engineering


  • What continuous engineering is
  • How to continuously improve complex product designs
  • How to anticipate and respond to markets and clients
  • How to get the most out of your engineering resources

Get your free book now

Sponsored by IBM

Free Dummies Books
Service Virtualization

Learn to:

  • Define service virtualization
  • Select the most beneficial services to virtualize
  • Improve your traditional approach to testing
  • Deliver higher-quality software faster

Get your free book now

Sponsored by IBM