[Gllug] parsing command output

[salsaman]

Hi all,
I need a little bash script that should do the following -
run a program and parse the output on stderr. It needs to write the 
fourth field of the 7th and 8th lines to a file. Fields are separated by 
one or more spaces and lines can also start with a space.

E.g. if the output of command "foo" on stderr is:

1abc
2def
3abc
4def
5abc
 6 mmmm
 7abc    123    56 1024    xxx
 8abc    123     56  768    yyy
9 aaa

then the result in out.txt should be:
1024
768


Thanks in advance,
Gabriel.

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