How to search a pattern in a file and loop

Question

     I have a csv config file:
HLR, /data/hlr1.csv
HLR, /data/hlr2.csv
PCMR, /data/pcmr.csv
XYZ, /pkg/xyz4.csv
I have a shell script which will be passed a parameter. This parameter I need to lookup in the first field of the cofig file and display the corresponding second field in the config file. For example if the parameter passed to shell script is HLR I need to lookup the config file and should retrieve:
/data/hlr1.csv
/data/hlr2.csv

Answer 1

An example (it might be done in other ways) :
# cat config.csv
HLR, /data/hlr1.csv
HLR, /data/hlr2.csv
PCMR, /data/pcmr.csv
XYZ, /pkg/xyz4.csv
# grep HLR config.csv | cut -f2 -d" "
/data/hlr1.csv
/data/hlr2.csv
# grep XYZ config.csv | cut -f2 -d" "
/pkg/xyz4.csv
If you need a loop you can do something like this
# cat config.sh
grep $1 config.csv | cut -f2 -d" " | while read FILE
do
        echo $FILE
        # do here something else
done