vi srv_request.unl
10157|984|0|0|A|1234|time stamp = 2009-02-21 02:11:56|370987678901206|Card is already hot in
PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.72|
10158|984|0|0|A|1234|time stamp = 2009-02-21 02:31:16|370987678901206|Card is already hot in
PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.72|
10159|984|0|0|A|1234|time stamp = 2009-02-21 03:19:16|370987678901206|Card is already hot in
PPS, error in 10.248.11.33, 10.248.11.33 and 10.248.11.33|
10160|969||0|A|111|time stamp = 2009-02-21 03:23:57|345353453453453454|Card is already hot in
PPS, error in 10.248.11.33, 10.248.11.33 and 10.248.11.33|
10161|984|0|0|A|1234|time stamp = 2009-02-21 04:25:50|370987678901206|Card is already hot in
PPS, error in 10.248.11.33, 10.248.11.33 and 10.248.11.33|
10162|984|0|0|A|1234|time stamp = 2009-02-21 04:27:37|370987678901206|Card is already hot in
PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.72|
10163|984|0|0|A|1234|time stamp = 2009-02-21 04:50:46|370987678901206|Card is already hot in
PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.72|
10164|984|0|0|A|1234|time stamp = 2009-02-21 05:05:48|370987678901206|Card is already hot in
PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.72|
10165|985||0|A|12345|time stamp = 2009-03-18 01:32:56|1234567890|Card is Hotted in PPS, error
in 10.248.11.72, 10.248.11.72 and 10.248.11.72: HOT|
10166|986||0|D|ferant r|time stamp = 2009-03-18 01:42:4 |regemque dedit|Card is already unhot
in PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.|

The above data is unloaded from a table named srv_request
and unloaded to a file called srv_request.unl
using the following command

UNLOAD TO srv_request.unl
SELECT * FROM srv_request

What I have to do is to write shell Program which checks for every row of data in the srv_request.unl file and checks for the time stamp label and decrement the time by 1 hour which is followed by the time stamp label
For example for the first row of data
10157|984|0|0|A|1234|time stamp = 2009-02-21 02:11:56|370987678901206|Card is already hot in
PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.72|
the time stamp = 2009-02-21 02:11:56
so it should be decremented by one hour and the new time stamp should become time stamp = 2009-02-21 01:11:56

After every row data the time stamp decrementation is acieved then the corresponding data will be inserted to srv_request table.
Inserting the data back to the table is simple that can be acieved by following statement

LOAD FROM srv_request.unl
INSERT INTO srv_request

The main headache is in writing the logic for reading each row of data of the file(i.e srv_request.unl) and for each row i need to check for the time stamp label then decrement the time by 1 hour.

Remember I am using Informix Dynamic Server Version 9.40.FC9
and operating System is Unix (HP-Ux)

I know how to read line by line in a file which is something like this
while read line
do
echo $line
done < "myfile"

the problem lies in checking for the string "time stamp" and decrementing the time followed by the string "time stamp"
for example
10157|984|0|0|A|1234|time stamp = 2009-02-21 02:11:56|370987678901206|Card is already hot in
PPS, error in 10.248.11.72, 10.248.11.72 and 10.248.11.72|