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Extracting 10 digit number from txt files

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# 8  
Old 08-07-2006
Quote:
Originally Posted by tmarikle
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.
I agree - it's up to you. I like to use cat to pipe everything to next command. The above command is the same as following:

sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p' t1.txt t2.txt t3.txt t4.txt t5.txt
# 9  
Old 08-07-2006
Quote:
Originally Posted by xb88
I agree - it's up to you. I like to use cat to pipe everything to next command. The above command is the same as following:

sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p' t1.txt t2.txt t3.txt t4.txt t5.txt
I'd suggest reading the posted link to UUoC or this one.

BTW......

Code:
sed -n -e 's/.*\([0-9]\{10\}\).*/\1/p' t[1-5].txt

# 10  
Old 08-07-2006
Also BTW, if you need to check for only 10 character numbers, on word boundaries, this alternative may narrow the scope:

Code:
sed -n -e 's/\(\<[0-9]\{10\}\>\)/\1/p'
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