Cron problem

Hi all, Many an eon have I been a silent watcher of the Informix newsgroup (and thanks again Walt for a job well done), silently watching and waiting for my moment of glory. And now it has come! Every evening at 5pm I run the following from cron 00 17 * * 1,2,3,4,5 /usr/clark/sitedatunl.sh Eight out of ten times this works fine, but every week or so it falls over with the message -802 Cannot open file for run Finderr 802 tells me this:- -802 Cannot open file for run. The SQL command file you specified cannot be opened for reading. Review the file name specified. If it is spelled as you intended, make sure that it exists in the current directory or in a directory named in the DBPATH environment variable and that your account has read permission for it. The strange thing is, I know that the command file is there. This is evidenced by the fact that if I keep typing /usr/clark/sitedatunl.sh a few times (say 5 times over a five minute period) it will work. Maybe it's something to do with my current working directory? There is definitely no-one else on the system editing this file. So what is causing the -802? FYI the shell script INFORMIXDIR=/usr/informix PATH=$PATH:/usr/informix/bin DBDATE=DMY4/TBCONFIG=tbconfig.01 export INFORMIXDIR PATH DBDATE TBCONFIG/usr/informix/bin/dbaccess -s live sitedatunl.sql rcp /tmp/stunload rswa:/usr/rs/rswa/. FYI the SQL command file unload to "/tmp/stunload" select stsh_stockid, stsh_onhandqty / stsm_ssm, (stsh_onordqty + stsh_isordqty) / stsm_ssm, stsh_backordqty / stsm_ssm, stsh_minqty / stsm_ssm, stsh_optqty / stsm_ssm from st_stockhold, st_stockmaster where stsh_siteid = "W" and stsm_stockid = stsh_stockid Any help would be appreciated. Clark __ _ _ / ) // / _// _/_ / // __. __ /_ / __. , , , / ________ (__/ </_(_/|_/ (_/ <_ /___ (_/|_(_(_/_<__(_) / / <_ MIS Manager RS Components - Australian Group