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Phew, what an ordeal! Far from elegant, utterly clumsy, but it does what is requested:awk '
BEGIN {ARGV[ARGC++] = ARGV[1]
HD[++HDCNT] = "InsertTime"
...

Hi pdathu,
Someone who has been posting questions to this forum for well over 4 years is not "a newbie who has never had a chance to work on the advanced commands".

You may have chosen to use...

Well, one pass only, and slightly prettier:awk '
BEGIN {HD[++HDCNT] = "InsertTime"
HD[++HDCNT] = "DocID"
}

/^#col/ {FS = "\047"
...

given a ${FILE}/a/b/c_d_e.txt get an 'e'.
an alternative solution might be:

echo '/a/b/c_d_e.txt' | nawk -F'[/_.]' '{print $(NF-1)}'

What about this:
sed -e 's/record/ebcdic record/' -e 's/integer (10) present_id;/string (12) present_id;/' Inp_File > Out_File

opt 2>/dev/null this is just redirecting anything output to stderr (typically getopts will print some sort of message about illegal options eg "getopts: -i option unknown" to sterr). For example:
$...

read "man test" for mor information about the condition topic...

and please use code tags for terminal output or script sniplets!

Yes,
if [[ -z $VAR ]] condition is true if $VAR is empty
if [[ -n $VAR ]] condition is true if $VAR is not empty