Print specific lines from file

Question

I have a text file like this:

OBJ O1 = {
{P11},
{0}
};

OBJ O2 = {
{P21},
{P22},
{P23},
{0}
};

OBJ O3 = {
{P31},
{P32},
{0}
};

I want to print only lines starting by OBJ O2 and ending by first {0} after OBJ O2

OBJ O2 = {
{P21},
{P22},
{P23},
{0}
};

Is there a solution to print these lines using cat, sed, awk or grep?

score 1 · Accepted Answer · answered Jul 22 '19 at 15:45

1

You can do this :

awk '/OBJ O2/,/^};$/' file

answered Jul 22 '19 at 15:45

Corentin Limier

Or `awk '$2=="O2"' RS= input` or `awk '$1$2=="OBJO2"' RS= input` – William Pursell Jul 22 '19 at 16:05
`awk '/^OBJ O2/' RS= input` – William Pursell Jul 22 '19 at 16:05
Got it `The empty string "" (a string without any characters) has a special meaning as the value of RS. It means that records are separated by one or more blank lines and nothing else.` - works quite well on this case ! – Corentin Limier Jul 22 '19 at 16:14

score 0 · Answer 2 · answered Mar 19 '21 at 15:04

0

awk '/^OBJ O2/{f=1} f{print; if(/};/) f=0}' file

answered Mar 19 '21 at 15:04

Thomas Hansen

2 Answers2