#!/usr/bin/env bash

# @(#) s3	Demonstrate match across lines, grep.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
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 grep

FILE=${1-data1}

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

pl " Results, grep for RITE AID back to ST*82 across lines:"
if grep -F -B1 'RITE AID' $FILE |
grep -q -F -A1 'ST*82'
then
  printf "$FILE\n"
fi

FILE=data3
pl " Input data file $FILE:"
cat $FILE

pl " Results, grep for RITE AID back to ST*82 across lines:"
if grep -F -B1 'RITE AID' $FILE |
grep -q -F -A1 'ST*82'
then
  printf "$FILE\n"
fi

exit 0

$ ./s3

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 5.0.8 (lenny, workstation) 
bash GNU bash 3.2.39
grep GNU grep 2.5.3

-----
 Input data file data1:
ISA*00* 00 *ZZ*NATIONSBANK *14*0030020520500 *140918*1200*U*00401*000006436*0*P*^ 
GS*RA*014578892*IGIHCJEEJ*20140918*1200*6442*X*004010
ST*820*000006482 
N1*PR*RITE AID HDQTRS. CORP.*1*014578892

-----
 Results, grep for RITE AID back to ST*82 across lines:
data1

-----
 Input data file data3:
ISA*00* 00 *ZZ*NATIONSBANK *14*0030020520500 *140918*1200*U*00401*000006436*0*P*^ 
GS*RA*014578892*IGIHCJEEJ*20140918*1200*6442*X*004010
ST*820*000006482 
not a matching line
N1*PR*RITE AID HDQTRS. CORP.*1*014578892

-----
 Results, grep for RITE AID back to ST*82 across lines: