Using awk
or sed
how can I select lines which are occurring between two different marker patterns? There may be multiple sections marked with these patterns.
For example:
Suppose the file contains:
abc
def1
ghi1
jkl1
mno
abc
def2
ghi2
jkl2
mno
pqr
stu
And the starting pattern is abc
and ending pattern is mno
So, I need the output as:
def1
ghi1
jkl1
def2
ghi2
jkl2
I am using sed to match the pattern once:
sed -e '1,/abc/d' -e '/mno/,$d' <FILE>
Is there any way in sed
or awk
to do it repeatedly until the end of file?
Best Answer
Use
awk
with a flag to trigger the print when necessary:How does this work?
/abc/
matches lines having this text, as well as/mno/
does./abc/{flag=1;next}
sets theflag
when the textabc
is found. Then, it skips the line./mno/{flag=0}
unsets theflag
when the textmno
is found.flag
is a pattern with the default action, which is toprint $0
: ifflag
is equal 1 the line is printed.For a more detailed description and examples, together with cases when the patterns are either shown or not, see How to select lines between two patterns?.