Unix shell script,read from file?

how to read contents from the file in unix shell script.plz help.


or give me a link to find it

Unix shell script,read from file?
#!/bin/ksh


# This Korn script will read one line from a file


# and display it on the screen


#


OLDIFS=${IFS}


IFS="\n"


integer LINENO=0


exec 3%26lt; sample.dat


while read -ru3 DATALINE


do


LINENO=${LINENO}+1


echo "${LINENO}\t${DATALINE}"


done


IFS=${OLDIFS}


# end of script