OT: help with text file?

[Cameron Simpson]

On 17Jan2009 22:24, Matthew Flaschen <matthew.flaschen at gatech.edu> wrote:
| Cameron Simpson wrote:
| > On 17Jan2009 20:36, Matthew Flaschen <matthew.flaschen at gatech.edu> wrote:
| > | Dave Stevens wrote:
| > | > I have a sequence of lines of ASCII text of varying length, each of which ends 
| > | > with an integer. Anyone have a quick and dirty way of getting these lines 
| > | > copied to a new file with only the last number on each line of the new file?
| > | 
| > | How about:
| > | grep -o -E [[:digit:]]+$ foo.txt > new_file.txt
| > 
| > I see your grep and raise you a sed:
| > 
| >   sed 's/.*[^0-9]//' foo.txt >new_file.txt
| 
| I see your sed and raise you an optimized but less readable grep.
| 
|     grep -oE [0-9]+$ foo.txt>new_file.txt

Hoping his numbers are whitespace delimited, I raise you an awk,
even more readable than the sed.

  awk '{print $NF}' foo.txt >new_file.txt

I'd point out that you need to do more shell quoting; if the OP has the
misfortune to have a file called '3+$' lying around your grep won't do
what you intend...

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

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