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String replace in shell script

Hi Friends and Guru's

I need to replace a string in my script..

my sample file :

root# cat passwd
################################
This is script generated file

tftp = off
dns = off

my script:
#!/bin/sh
cat /nir/passwd | grep tftp >/dev/null
RC=$?
if [ "$RC" = 0 ] ; then
echo "Tftp is exist"
RM=`cat /nir/passwd | grep tftp | awk '{print$3}'`

if [ $RM = off ] ; then

echo "Fail: TFTP is : $RM: Do you want to make it : ON"
else
echo " TFTP is | ON......exiting"
fi
fi

in my sample its showing tftp = off and it should to modified to tftp = on.

any help is appreciateable

Thanks In Advance
JNReddy

Here's one solution... the answer you seek is in bold text.

Code:

#!/bin/bash



FILE=passwd



state=`grep tftp $FILE | awk '{print $3}'`



if [ "$state" == "" ]; then

        echo "Error; TFTP not defined in $FILE"

        exit 1



elif [ "$state" == "off" ]; then

        echo -n "Do you want to enable TFTP (y/n)? [y] "

        read ans



        if [ "$ans" == "" -o "$ans" == "y" ]; then

                sed -e "s/tftp = off/tftp = on/" -i $FILE

                echo "TFTP has been turned ON."

        else

                echo "TFTP will be left OFF... exiting"

        fi



elif [ "$state" == "on" ]; then

        echo -n "Do you want to disable TFTP (y/n)? [y] "

        read ans



        if [ "$ans" == "" -o "$ans" == "y" ]; then

                sed -e "s/tftp = on/tftp = off/" -i $FILE

                echo "TFTP has been turned OFF."

        else

                echo "TFTP will be left ON... exiting"

        fi



else

        echo "TFTP is neither ON or OFF... exiting"

        exit 1

fi



exit 0

Hi dwhitney67,

Thanks a Lot it's an excellent script, it solved my task....

Thanks a lot...

Thanks
JNReddy

Please mark as SOLVED once you have a solution