Want to extract certain lines from big file Post: 302965108

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Top Forums Shell Programming and Scripting Want to extract certain lines from big file Post 302965108 by Aia on Saturday 23rd of January 2016 11:21:34 PM

01-24-2016

Registered User

Extracting the first transaction only.

Code:

perl -ne 'print if /^##transaction\b/ .. /EOT$/; last if /EOT$/' mad_man.example

Code:

##transaction, , , ,blah, blah
%%blah~trannum~blah~blah~blah
0000content01
0001content02
.
.
0010contentnn
0000EOT

---------- Post updated at 09:21 PM ---------- Previous update was at 08:54 PM ----------

Extract the first two transactions:

Code:

perl -ne 'print if /^##transaction\b/ .. /EOT$/; /EOT$/ and ++$n; last if $n==2' mad_man.example

Code:

##transaction, , , ,blah, blah
%%blah~trannum~blah~blah~blah
0000content01
0001content02
.
.
0010contentnn
0000EOT
##transaction, , , ,blah, blah
%%blah~trannum~blah~blah~blah
0000content03
0001content04
.
.
0010contentnn
0000EOT

Extract only the second transaction:

Code:

perl -ne 'if(/^##transaction\b/ .. /EOT$/){ print if $n==1; /EOT$/ and ++$n }; last if $n==2' mad_man.example

Code:

##transaction, , , ,blah, blah
%%blah~trannum~blah~blah~blah
0000content03
0001content04
.
.
0010contentnn
0000EOT

Extracting any transaction by using a variable:

Code:

export t=2; perl -ne 'if(/^##transaction\b/ .. /EOT$/){ print if $n==$ENV{t}; /EOT$/ and ++$n }; last if $n==$ENV{t}+1' mad_man.example

Code:

##transaction, , , ,blah, blah
%%blah~transnum~blah~blah~blah
0000content05
0001content06
.
.
0010contentnn
0000EOT

Extract last transaction:

Code:

perl -ne '/^##transaction\b/ and @t=(); push @t, $_ if /^##transaction\b/ .. /EOT$/; END{print @t}' mad_man.example

Code:

##transaction, , , ,blah, blah
%%blah~transnum~blah~blah~blah
0000content05
0001content06
.
.
0010contentnn
0000EOT

Last edited by Aia; 01-24-2016 at 12:40 AM..

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