UNIX for Dummies Questions & Answers

#!/usr/bin/env bash

# @(#) s1	Demonstrate extraction from XML file, xml_grep, xgrep.
# xml_grep: part of xml-twig-tools package, q.v.
# xgrep: http://wohlberg.net/public/software/xml/xgrep/

# 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 xgrep xml_grep

FILE=${1-data1}

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

pl " Results, xgrep:"
xgrep -t -s "Document:corspd_num/.*/" $FILE

pl " Results, xml_grep:"
xml_grep -t "corspd_num" $FILE

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 5.0.8 (lenny, workstation) 
bash GNU bash 3.2.39
xgrep 0.08 (libxml2,pcre)
xml_grep /usr/bin/xml_grep version 0.7

-----
 Input data file data1:
<?xml version="1.0" encoding="utf-8"?>
<Data>
  <Request>
    <output_option>PCL</output_option>
    <slip_page_indicator>N</slip_page_indicator>
    <corspd_id>0003958228</corspd_id>
    <eff_dt>2015-05-20</eff_dt>
    <pgm_typ_cd>FS</pgm_typ_cd>
    <csld_num/>
    <off_id>000000</off_id>
    <actn_cd>T</actn_cd>
    <cpy_qty>01</cpy_qty>
    <Reason_Codes>
      <Reason_Code>FAS701</Reason_Code>
    </Reason_Codes>
    <Mailing_Addresses>
      <adr_cnt>01</adr_cnt>
      <Mailing_Address>
        <sort_info>954076262Elsa628CF123f3343</sort_info>
        <addresee1>Narah Ornbaun</addresee1>
        <addresee2/>
        <street_adr1>628 Elsa DR</street_adr1>
        <street_adr2/>
        <city>Santa Jose</city>
        <state>CA</state>
        <zip>95407-6262</zip>
        <postnet>*954076262289*</postnet>
        <email>N</email>
        <hrdcpy>Y</hrdcpy>
      </Mailing_Address>
    </Mailing_Addresses>
    <Document><doc_name>ALL_NOA_NO_Budget_Master_Document</doc_name><language>EN</language><corspd_num>CDS 66S-0 (4/00)</corspd_num>

</Document>
  </Request>
</Data>

-----
 Results, xgrep:
<Document><doc_name>ALL_NOA_NO_Budget_Master_Document</doc_name><language>EN</language><corspd_num>CDS 66S-0 (4/00)</corspd_num>  </Document>

-----
 Results, xml_grep:
CDS 66S-0 (4/00)

...<corspd_num>data</corspd_num>...

awk -F'</corspd_num' -v RS='>' 'NF > 1{print $1}' DRIVER_TagString