#!/usr/bin/env bash

# @(#) s1	Demonstrate extraction of string=integer.

# 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 grep awk

FILE=${1-data1}

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

pl " Results:"
grep -E -o '(USU-INOCT|USU-OUTOCT)=[0-9]+' $FILE |
tee f1 |
awk -F= '
/IN/	{ sumi += $2 ; next }
/OUT/	{ sumo += $2 }
END	{ print sumi, sumo, sumi+sumo }
'

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) 
bash GNU bash 3.2.39
grep GNU grep 2.5.3
awk GNU Awk 3.1.5

-----
 Input data file data1:
 <MSCC-1>   <RSU>  </RSU>  <USU> USU-TariffTimeChange=0 USU-INOCT=12772 USU-OUTOCT=39177</USU> <USU> USU-TariffTimeChange=1 USU-INOCT=178 USU-OUTOCT=144</USU> SID=46 RG=46 R.REASON=VLD </MSCC-1>   
 <MSCC-1>   <GSU>  GSU-TOTOCT=1024000 </GSU>  SID=46 RG=46 VALTIME=1700 RESULT-CODE=2001 V.Q.THRESHOLD=102400 </MSCC-1>   
 <MSCC-1>   <RSU>  </RSU>  <USU> USU-INOCT=139072 USU-OUTOCT=818813</USU> SID=46 RG=46 R.REASON=VLD </MSCC-1>   
 <MSCC-1>   <GSU>  GSU-TOTOCT=1024000 </GSU>  SID=46 RG=46 VALTIME=1700 RESULT-CODE=2001 V.Q.THRESHOLD=102400 </MSCC-1>   
 <MSCC-1>   <RSU>  </RSU>  <USU> USU-INOCT=122714 USU-OUTOCT=902004 USU-R.RES=QEX</USU> SID=46 RG=46 </MSCC-1>   
 <MSCC-1>   <GSU>  GSU-TOTOCT=1024000 </GSU>  SID=46 RG=46 VALTIME=1700 RESULT-CODE=2001 V.Q.THRESHOLD=102400 </MSCC-1>   
 <MSCC-1>   <RSU>  </RSU>  <USU> USU-INOCT=121962 USU-OUTOCT=902846 USU-R.RES=QEX</USU> SID=46 RG=46 </MSCC-1>   
 <MSCC-1>   SID=46 RG=46 RESULT-CODE=4012 </MSCC-1>   
 <MSCC-1>   <USU> USU-INOCT=52 USU-OUTOCT=0</USU> SID=46 RG=46 R.REASON=FNL </MSCC-1>

-----
 Results:
396750 2662984 3059734