grep problem - UNIX for Dummies Questions & Answers

asal_email2 · #1 (**permalink**) 06-22-2005

I know that grep will display the matched line, but how about if I want to get the matched characted, for example:

file.txt contains:
Hello 123 World
This is a56 letter34
56are you su345re ?
1000 yes I do

I want to list all instances of digits that appear e.g:
123
56
34
56
345
1000

do I have to use sed ?

Thanks !

ortsvorsteher · #2 (**permalink**) 06-22-2005

Hello,

you can use

grep [0-9] filename

but without sed.... it doesnt work...

regards

matrixmadhan · #3 (**permalink**) 06-22-2005

i believe this wont work

above reply would extract the entire line if matched

and the question was to retrieve only the numeric instances from the file

vino · #4 (**permalink**) 06-22-2005

For grep.

Code:

grep -o '[0-9][0-9]*' filename

Vino

asal_email2 · #5 (**permalink**) 06-22-2005

Thanks

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