How to sort text file based on number after first letter

Question

I have a text file in linux that looks like this:

H-988   -0.5418829321861267 no
H-989   -0.5033702254295349 yes
H-990   -1.1516857147216797 hi
H-99    -0.5005123019218445 hello

I want to sort this file based on the number coming after the hyphen. So the order should be:

H-99    -0.5005123019218445 hello
H-988   -0.5418829321861267 no
H-989   -0.5033702254295349 yes
H-990   -1.1516857147216797 hi

I tried the grep sort command but it did not work. For example it puts 95 after 949 instead of before same goes for 99 and 990 as the example provided

Answer 1

You should sort as numerically,

sort --numeric-sort --field-separator "-" --key 2 some.txt

or a shorter version

sort -n -t "-" -k 2 some.txt

Answer 2

If the first field always has only two characters before the number, you can skip them:

sort -k1.3,1n ip.txt

-k1.3 tells sort to start considering the field (which is 1 here) only from the third character