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Using a pipe puts the loop into a subshell. Any variable changes inside it aren't reflected outside the loop, and once the loop finishes, the subshell ceases to exist. It's kind of like the...

change:
cat $_file | while read _line
do

done
to

while read _line
do

done < $_file

I do not know what you are are trying to accomplish, but try this:
if [ "$_CHAR" -eq "$_CHAR" ] 2>/dev/null || [ "$_CHAR" = "*" ]; then

Use single =
put double quotes around $_CHAR

Put a space between [ and $

Do not put 2>/dev/null inside the brackets

try with "-o" option instead of "||".

So,

You do not need the "2>/dev/null" part in a boolean (if) construct. It doesn't evaluate.
And. I do not know why your first line works. It should not.

---------- Post updated at 09:01...

This might work:
sed 's/SCSGTI:N="$\([0-9]*,\)\{4\}\(.*\)-->RemoteSPC: \([^," ]*\)\( SSN: \([^," ]*\)\)*\(,Sec:RemoteSPC: \([^," ]*\)\)*\( SSN: \([^," ]*\)\)*",.*/\2,\3,\5,\7,\9/' infile |
while...

Do you mean like this?
$ sed 's/SCSGTI:N="$\([0-9]*,\)\{4\}/GT=/;s/-->RemoteSPC: / SPC1=/;s/SSN: /SSN1=/;s/,Sec:RemoteSPC: / SPC2=/;s/SSN: /SSN2=/;s/",.*//' infile
GT=34622991111 SPC1=1111...