get matched lines + lines after the matched lines till empty line

[ogniemi]

example:

#-begin text file
====
adate
1111

bleble
ble
====
adate
2222

ble
ble

====
adate

ble
====
adate
5
5

ble
#-end text file

'grep'ing for "====" expected result is:

====
adate
1111
====
adate
2222
====
adate
====
adate
5
5


thx in adv.!

 

[feherke]

Hi

See if your [tt]grep[/tt] has -A option.

-A NUM, --after-context=NUM
Print NUM lines of trailing context after matching lines.
Places a line containing -- between contiguous groups of
matches.

Feherke.

http://rootshell.be/~feherke/

 

[ogniemi]

i haven't gnu grep...

 

[ogniemi]

...besides for each matched line numer of lines after this matched line is not the same

 

[feherke]

Hi

sed -n '/^====$/{p;n;/^$/!{p;n;/^$/!p}}' /input/file

[gray]# or[/gray]

awk '$0=="===="{print;getline;if(NF){print;getline;if(NF)print}}' /input/file

Feherke.

http://rootshell.be/~feherke/

 

[p5wizard]

You might also try the grep -p (paragraph). Only thing is, you get the whole paragraph (also the lines preceding your match).

awk can be helpful:

# awk '/\=\=\=\=/,/^$/' file

but you get the empty line also...

HTH,

p5wizard

 

[ogniemi]

Thank you but I made a mistake - after the "adate" there is empty line so the expected result is:

====
adate

1111
====
adate

2222
====
adate

====
adate

5
5


in the other words i need grep from matched line till second occurence of empty line after that matched line

 

[Salem]

perl -n -e 'print if ( /adate/ .. /^$/ );' file.txt

--

 

[p5wizard]

or with awk:

awk '{
if ($0 == "====") {flag=2}
if ($0 == "") {flag--}
if (flag > 0) {print}
}' file


HTH,

p5wizard

 

[p5wizard]

or if the starting RE is embedded in other text:

awk '{
if ($0 ~ "====") {flag=2}
if ($0 == "") {flag--}
if (flag > 0) {print}
}' file


HTH,

p5wizard

 

[PHV]

Or perhaps this ?
awk '/^====/{nr=3+NR}NR<=nr' /path/to/textfile

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ181-2886