Supppose we have the file test.txt containing :

blabla
blabla
foo
here
is the
text
to keep between the 2 patterns
bar
blabla
blabla

The following code can be used :

sed -n '/foo/,/bar/p' test.txt

For the following output :

foo
here
is the
text
to keep between the 2 pattern
bar

Supppose we have the file test.txt containing :

blabla
blabla
foo
here
is the
text
to keep between the 2 patterns
bar
blabla
blabla

The following code can be used :

sed -n '/foo/,/bar/p' test.txt

For the following output :

foo
here
is the
text
to keep between the 2 patterns
bar