How to find the number of records in an IFS file

I have a CLP that converts an IFS file to a DB file.

I would like to do an ovrdbf for number of records on the output file to make sure it
doesn't exceed it's limits.

There are millions of records in the files.
I have tried this but I think it only works on System i files. (Not IFS)
DCLF FILE(QAFDMBR)
DSPFD FILE(&INPUTFILE) TYPE(*MBR) OUTPUT(*OUTFILE) +
FILEATR(*ALL) OUTFILE(QTEMP/QAFDMBR)
OVRDBF FILE(QAFDMBR) TOFILE(QTEMP/QAFDMBR) POSITION(*START)
RCVF
/* The number of records are in &MBNRCD */
OVRDBF FILE(&OUTPUTFILE) SEQONLY(*YES &MBNRCD)

I have tried this but I don't understand where the number of records ends up.
QSH CMD('cat /home/Payroll/ATU_PAYROLL_DATA_FY14_372_398.txt | wc -l')

I have never used QSH before.

Thanks,

Gary Kuznitz