Shell Programming and Scripting

.I 1
some text
.A
this is the first line
.I 2
some text again
.B 
this is the second line
.I 3
again some text
.C 
this is the third line

.I 1
some text
.A
this is the first line

.I 2
some text again
.B 
this is the second line

.I 3
again some text
.C 
this is the third line

awk '/.I/{c++}{print > c".txt"}' test_file.tst

awk '/.I /{c++}{print > c".txt"}' test_file.tst

awk '/.I /{close(c++".txt")}{print > c".txt"}' test_file.tst

.I 148
.U
870
.S
Br 
.M
abc
.T
tiger.
.P
JOURNAL ARTICLE.
.W
We succeeded in r.
.A
GoY.

awk '/\.I /.....

awk '/^\.I /.....

#!/usr/bin/env bash

# @(#) s1	Demonstrate splitting based on context, csplit.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C csplit

FILE=${1-data1}

# Remove debris from previous runs.
rm -f xx*

pl " Input data file $FILE:"
cat $FILE

pl " Results:"
csplit -k -z -q $FILE '/^\.I/' '{*}'
ls -lgG xx*

SAMPLE=xx02
pl " Sample of output file $SAMPLE:"
cat $SAMPLE

exit 0

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
GNU bash 3.2.39
csplit (GNU coreutils) 6.10

-----
 Input data file data1:
.I 1
some text
.A
this is the first line
.I 2
some text again
.B 
this is the second line
.I 3
again some text
.C 
this is the third line
.I 148
.U
870
.S
Br 
.M
abc
.T
tiger.
.P
JOURNAL ARTICLE.
.W
We succeeded in r.
.A
GoY.

-----
 Results:
-rw-r--r-- 1 41 Sep 25 17:45 xx00
-rw-r--r-- 1 49 Sep 25 17:45 xx01
-rw-r--r-- 1 48 Sep 25 17:45 xx02
-rw-r--r-- 1 88 Sep 25 17:45 xx03

-----
 Sample of output file xx02:
.I 3
again some text
.C 
this is the third line

awk '/^\.I /.....