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Yes, I have -k in man page. but it is
-k, --key=POS1[,POS2]
start a key at POS1, end it at POS2 (origin 1)

there is no explanation for "-k.". It is comma, not dot.
thank you.

Yes, this one works. But I don't know why even after I read
the man page of sort. There is no "-k.". Would you please
explain why this one works? thank you.

by the way I tried to use --debug,...

Thank you. I tried that. but the file of or10000.dat is still
in front of or100.dat.
it seems not to work.

Hi Everyone,

I have a question:
I have a lot of file named like
or10000.dat, or9100.dat, or100.dat, or3100.dat...
I want to deal with these files according to the
number in the name. So I want...

Thanks

I have many files which contain about two million lines.
Now I want to use sed to delete the 9th line and add a new
line behind the 8th line. I use the command as follows:
for((i=1;i<100;i++));...

it works, Thank you.

I found that
echo "aaa" | awk '{print ",\\";}'
works, and it will give "\".

but
ddd=`echo "aaa" | awk '{print ",\\";}'`; echo $ddd
will not work.
Could anyone tell me why? thank you.