With a file that size, you should really be using awk.

Please put code inside [code] tags.

m_arr_ctr=1
cat ${m_recv_dir}/${m_glb_d92_nm}${m_glb_file_seq} |while read d92_line

That cat is an unnecessary external command, but since it is only run once, eliminating it wll make very little difference.

Part of the slowness is due to calling multiple external commands (many of which are unnecessary: there's no need for expr as the shell can do its own arithmetic) for every line.

do
m_brch_cd=`echo "${d92_line}" |cut -c166-168`

What shell are you using? If it's bash or ksh93, you can replace the call to cut:

Code:

m_brch_cd=${d92_line:165:3}

for m_file_name in `echo ${m_a_d92_files[*]}`

An unnecessary subshell (here and later) can add a significant amount of time. Use:

Code:

for m_file_name in "${m_a_d92_files[@]"

do
if [[ `grep "*/" ${m_file_name} | wc -l` = 0 ]]

You don't need wc as well as grep:

Code:

if grep "*/" ${m_file_name} > /dev/null

then
echo "*/" >> ${m_file_name}
fi
done
for m_file_name in `echo ${m_a_d92_list[*]}`
do
rm -f $m_file_name
done
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