Adding Header and Trailer records to a appended file

Shell Programming and Scripting
1

How can we a shell script and pass date parameters .I have 3 files comming from Datastage with |" delimited
I need append 3 files as above: File1:

P0000|"47416954|"AU|"000|"INS|"0000|"|"20060601|"99991231|"|"|"|"|"01

File 2:

P0001|"47416954|"AU|"000|"INS|"0001|"|"20060501|"99991231|"|"|"|"|"4210|"4210|"1|"2S|"GB|"|"4211|"8M

File 3:

P0002|"47416954|"AU|"000|"INS|"0002|"|"20060601|"99991231|"|"|"|"|"ALLY-POLLARD|"|"LEILA|"|"LEILA|"00|"2|"2|"19760411|"GB|"|"1|"20040828|"|"|"|"JE397813B

After append 3 files i need add Header and trailer for the single file
Header Should have following inforamtion:

RECTYP|"CLientid|"Cleint Name|"email|"RunDate|"RunTime

Rundate:YYYYMMDD format need to be passed
Run Time: HHMMSS in 24 hour format should be passed

Trailer Record:

RECTYP|"RECORD COUNT

Sample output should be like this

HEADR|"GVAADP|"ID |"MANI|"|"OT20060403|"20060403|"050020
P0000|"47416954|"AU|"000|"INS|"0000|"|"20060601|"99991231|"|"|"|"|"01
P0001|"47416954|"AU|"000|"INS|"0001|"|"20060501|"99991231|"|"|"|"|"4210|"4210|"1|"2S|"GB|"|"4211|"8M
P0002|"47416954|"AU|"000|"INS|"0002|"|"20060601|"99991231|"|"|"|"|"POLLARD|"|"LEILA|"|"LEILA|"00|"2|"2|"19760411|"GB|"|"1|"20040828|"|"|"|"JE397813B
TRAIL|"3

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2

What is the information in the header supposed to be generated from?

Everything but the date calculation sounds easy:

( echo HEADER
cat file1 file2 file3
echo FOOTER ) > outfile
3

How can we pass date and time in the header and record count in the Trailer record