Shell Programming and Scripting

echo "CP99978_${cv}.TXT"

file_name="$(echo "CP99978_$cv.TXT")"

function setToXXX() {
  echo changing value of $1
    eval "$1='$FOO'"
    }

    FOO=hello
    BAR=$FOO ;
    echo function, FOO is $FOO
    echo function, BAR is $BAR

    echo "FOO IS CHANGING" ;
    FOO="CHANGED VALUE" ;
    setToXXX BAR # you must call this function 

    echo after function, BAR is $BAR

for CV in CV000 CV09
do
 file_name="CP99978_${CV}.TXT"  ## no need of command substitution here 
 ## do sqlldr part..or other stuffs.
done

cv="$(echo "CV000")"

cv="CV000"

cv=1
cv=2
file=a_$cv
cv=3

job_name="$(echo "load_didrnge.sh")" ==> job_name="load_didrnge.sh"
table_name="$(echo "DIDRNGE")" ==> table_name="DIDRNGE"
cv="$(echo "CV000")" ==> cv="CV000"


cv="$(print 'CV09')" ==> cv="CV09"

# invalid commnad substitution. syntx err!.
file_name=`CP99978_`$cv`.TXT` ==> file_name=CP99978_${cv}.TXT 

# again same thing
file_name="$(awk '{print $1}' $cv )" ==> file_name="$(echo $cv | awk '{print $1}')" or file_name="$(awk '{print $1}' <<< $cv)"