grep searching interval

Shell Programming and Scripting
1

Hi all,
I just want to find all values that are in a specified interval. I tryed it with

grep e-[18-17] file

, it does not work.

Is it possible to get values wich are lower a special number, like

grep >e-18 file

?

Thanks a lot

2

Post the input file and the desired output.

3

input

0.4604        7.088    5.351e-10
0.536        8.395    1.612e-12
-0.5311       -8.208     3.72e-12
0.7112        8.725    3.685e-17
0.4604        7.088    5.351e-18
0.536        8.395    1.612e-19
-0.5311       -8.208     3.72e-17
0.7112        8.725    3.685e-13

grep e-[18-17] test.txt

output

0.4604        7.088    5.351e-10
0.536        8.395    1.612e-12
-0.5311       -8.208     3.72e-12
0.7112        8.725    3.685e-17
0.4604        7.088    5.351e-18
0.536        8.395    1.612e-19
-0.5311       -8.208     3.72e-17
0.7112        8.725    3.685e-13
4

Do you need to grep the records containing e-17 and e-18?

grep e-1[78] test.txt
5

it works, thanks!