i have a set of command that r executing can u plz explain does this command logon to infomix db


INFORMIXDIR=/usr/informix
INFORMIXSERVER=omc_sys1

INFORMIXSQLHOSTS=${INFORMIXDIR}/etc/sqlhosts_OMC

PATH=${PATH}:${INFORMIXDIR}/bin
DBNAME=omc_db

DBDATE=dmy4/
DBPATH=//omc_mib

export INFORMIXDIR INFORMIXSERVER INFORMIXSQLHOSTS PATH DBNAME DBDATE DBPATH
source /usr/gsm/config/global/pmInfxUserConfig.csh
/usr/bin/sed 's/1999-05-10/'$date11'/g' /home/shafique/GOS/GSR5_gos_0312.ace > /home/shafique/GOS/cellgos.ace