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Extract numerical values from text file in bash script

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Last Modified: 2013-12-26
Hi
  How can I put a numerical value to bash script variable from text file?
I have a text file with entire numerical values in some strings:

$cat numbers.txt:
23424
534
234566
95


I need select an first line put to text varible, convert to numerical value and then make arithmetical operation (add and divide) with these values.

Thank you.
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Commented:
Thank you for fast and exact solution.

Author

Commented:
Hello
  With ghostdog74 solution I get character values from text file and with omarfarid solution I can arithmetical operation in the form that I want.
 Thank you
CERTIFIED EXPERT
Top Expert 2007

Commented:
No need to use expr in a bash/ksh/zsh script as they have inbuilt maths functions, eg:

a=1
let b=a+10

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