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Not sure if this is safe:
. ./config_env.txt
while read line
do
eval echo $line >>new_properties.txt
done < ./config_properties.txt
Each line is evaluated first, expanding any shell...

awk '
NR==FNR { # for first file
c=0; # set column counter to 0
...

awk '
NR==FNR {c=0; for (i=4; i<=length; i+=2) a[substr($0,1,3),c++]=substr($0,i,2); next }
{
sub(substr($0,1,7),substr($0,1,3));
c=0;
l=substr($0,1,3);
for (i=4; i<=length; i+=2)...

Hi Shash,
Your desired output doesn't make any sense to me. When you find lines in both files for a given key, the data from the fields in both files are intermixed. When data is only found in one...

How about - for exactly your sample files given in post#1 -
awk '
{$0 = substr($0,1,3) " " substr($0,length-3,2) " " substr($0,length-1,2)
}

NR == FNR ...

awk -F";" '{if ($3"|"$4 != prev ) {print }prev=$3"|"$4}' filename

Would this work:sed 's/|/<\/td><td class="metric" align="right">/6; s/|/<\/td><td class="metric">/g; s/^/<tr><td class="metric">/; s/$/<\/td><\/tr>/' file
<tr><td class="metric">20150731</td><td...

While the single-quote-flag is discussed in e.g. my (linux) man printf it is not in FreeBSD. So its behaviour depends on the implementation.
bash (4.3.42(1)-release):printf "%'.2f\n"...

That's because of the e-mail-client is using a true type font.
You'll need to either select a monospace font or send an HTML file.

Bit simpler? Tryawk -F'|' '
{IX = $1 FS $2
}
FNR==NR {T3[IX] = $3
T4[IX] = $4
next
}
IX in T3 ...

Here is an awk approach:-
awk -F\| '
NR == FNR {
A[$1 FS $2] = $0
next
}
($1 FS $2) in A {
split(A[$1 FS $2], T)
...

Why? If it is a variable you can define it in any way you want, no?

Or is it some external input you need to use? In this case: how did it get into this variable? Perhaps there is a better way to...

You might try sth. along this line (tested in bash):OI="$IFS"
IFS=,
table_arr=($table_name)
col_arr=($col_name)
IFS="$OI"

Yes, there is. But in fact there is a better (and MUCH better readable) way to accomplish this if you use arrays - a feature almost every modern shell offers:

#! /bin/ksh

table[1]="table1" ;...

Not sure what you require. Would this fit your needs:IFS=","; for i in $src1; do src2=$i; echo $src2; done

You might want to give this a try:

while IFS="=" read part1 part2 ; do
print - "part1 is: $part1 part2 is $part2"
done < /path/to/file

Where file might contain:

part1=part2
a=b...