search - Remove lines after first match

Question

I need to remove all lines after the first line that contains the word "fox"

Say for example for the following input file "in.txt"

The quick
brown fox jumps
over
the
lazy dog
the second fox
is hunting

The result will be

The quick
brown fox jumps

I prefer a script made in awk or sed but any other command line tools are good, like perl or php or python etc.

For searching purposes I will add this line:

Remove lines after occurrence

Later edit:

I am using gnuwin32 tools in Windows, and the solution I could find was this one:

grep -m1 -n fox in.txt | cut -f1 -d":" > var.txt
set /p MyNumber=<var.txt
head -%MyNumber% in.txt > out.txt

However, I am looking for a solution that is shorter and that is portable (this one contains Windows specific command "set /p"

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Answer 1

awk '{print} /fox/{exit}' file

With GNU sed:

sed '0,/fox/!d' file

or

sed -n '0,/fox/p' file