How to delete characters after a "." (dot) in the first column?

Question

I want to delete characters after "." in the first column of my file, which looks like this:

location    LR  alpha
14884399.000000 0.471193    3.029710e+01
14904434.024291 0.440564    1.300841e-05
14924469.048583 0.356903    1.329721e-05

I want it to look like this:

location    LR  alpha
14884399    0.471193    3.029710e+01
14904434    0.440564    1.300841e-05
14924469    0.356903    1.329721e-05

I have tried these 2, they work but delete the second and the third columns:

echo ${input_var} | sed 's/\.[^ ]*/ /g' chr22.E.Asia.clrout

cat chr22.E.Asia.clrout | sed chr22.E.Asia.clrout col=1 's/\.[^ ]*/ /g' > new_chr22.E.Asia.clrout```

Thank you so much in advance!

Answer 1

From the comment seem's that you have resolved, however, here another couple of ways :

sed -E 's/(^[[:digit:]]+)\.[[:digit:]]+([[:space:]]+)/\1\2/g' file

Or awk:

awk '{ sub(/\.[[:digit:]]+/, " ", $1) }1' file