Shell Programming and Scripting

<Header name="[Measure]" TDate="[COB]" PDate="[PCOB]">
        <Config>
                {"config" { "Nation" "Pri:[Region]|Sec:[SecRegion]"}}
        </Config>
</Header>

cat Config.xml | sed -n 's/.*\[//;s/\].*//p'

PCOB
SecRegion

Measure
COB
PCOB
Region
SecRegion

#!/bin/ksh
 
for char in `cat Config.xml | awk '{ for(i=1;i<=length;i++) print substr($0, i, 1)}'`
do
        if [ "${char}" = "[" 2> /dev/null ]
        then
                flag=1
        fi
        if [ "${char}" = "]" 2> /dev/null ]
        then
                flag=0
                print "\n"
        fi
        if [ ${flag} -eq 1 2> /dev/null ] && [ "${char}" != "[" ]
        then
                print "${char}\c"
        fi
done

awk -F'[][]' '{for(i=2;i<=NF;i=i+2) print $i}' Config.xml

perl -lne '@arr=($_=~/\[(\w+)\]/g);$"="\n";print "@arr";'  input_file

awk 'NR>1{print $1}' RS=[ FS=] file

perl -lne 'print $1 while (/\[(.*?)\]/g)' file

sed -n '/\[/ {
        s/^[^\[]*\[//
        s/\]/\n/
        P
        D
        }
      ' Config.xml
Measure
COB
PCOB
Region
SecRegion

awk '{while(match($0,/\[[^]]*]/))
{
 print substr($0,RSTART+1,RLENGTH-2)
 sub(/\[[^]]*]/,"")
}}' file