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Shell Programming and Scripting

Getting number from a string

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# 1  
Old 01-06-2014
Getting number from a string
I have a string c12 and want to get the number 12

In general instead of 12 I can have any number. I have to capture the number as I need to do some computations on it.

I am using a bash script
# 2  
Old 01-06-2014
Try:
Code:
number=`echo $string | tr -d 'a-zA-Z'`

This User Gave Thanks to bartus11 For This Post:
kristinu
# 3  
Old 01-06-2014
Using parameter expansion:
Code:
bash-4.2$ v=c12
bash-4.2$ echo "${v//[!0-9]}"
12

# 4  
Old 01-06-2014
Longhand using cygwin...
Code:
AMIGA:~> var="c12fg"
AMIGA:~> echo "${var:1:2}"
12
AMIGA:~> _

# 5  
Old 01-06-2014
Some more

Code:
$ echo "c12" | tr -cd '[[:digit:]]' 
12

$ echo "c12" | awk 'gsub(/[[:alpha:]]/,x)' 
12

# 6  
Old 01-06-2014
Code:
result=`echo $string | egrep -o "[0,9]{1,5}"`

Last edited by bartus11; 01-06-2014 at 10:44 AM.. Reason: Please use code tags.
# 7  
Old 01-06-2014
if you have Ruby
Code:
# number=$(echo "c12" | ruby -e "puts gets.scan(/\d+$/)")
# echo $number
12

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