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Extracting 10 digit number from txt files

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# 1  
Old 08-07-2006
Extracting 10 digit number from txt files
Hi,

Was wondering if you could give me an example of extracting a 10 digit number from 5 txt files using a regular expression (the number is always different ) and storing the numbers in variables

Thanks

C19
# 2  
Old 08-07-2006
What you have attempted so far? It sounds like homework.
# 3  
Old 08-07-2006
Not quite homework!, i'm a developer for Barclays bank, shell scripting is new to me, and wondered about regular expressions, I've just ordered Shells by example, hopefully that should point me in the right direction...
# 4  
Old 08-07-2006
Try this:

your_variable=`cat t1.txt t2.txt t3.txt t4.txt t5.txt | sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p'`
# 5  
Old 08-07-2006
Quote:
Originally Posted by xb88
Try this:

your_variable=`cat t1.txt t2.txt t3.txt t4.txt t5.txt | sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p'`
once again..... why do you need 'cat'?
# 6  
Old 08-07-2006
Quote:
Originally Posted by vgersh99
once again..... why do you need 'cat'?
send the contents of the files (1 -5) to sed command for processing.
# 7  
Old 08-07-2006
Quote:
Originally Posted by xb88
send the contents of the files (1 -5) to sed command for processing.
vgersh99's point is that cat is not necessary since sed can read from multiple files. It's the whole UUoC (useless use of cat) idea.
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