How can I update a property in a property file? I am using
cat com/ams/einterfaces/custom/hutchison3guk/config/salesforceupload/SalesForceUploadTest.properties | sed "s@salesforcefile=*@salesforcefile=/opt/AMS/eINcent/live/in/$1@g" > com/ams/einterfaces/custom/hutchison3guk/config/salesforceupload/SalesForceUploadTest1.properties
It is not replacing the value but appending to the existing value.

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Try this
sed "s@salesforcefile=.*@salesforcefile=/opt/AMS/eINcent/live/in/$1@g"

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Excellent.
It worked fine.
Is any way to write on to the same file.
When i am writing on to the same file SalesForceUploadTest the file is becoming zero.

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If I am trying to copy or move i am using the following
mv SalesForceUploadTest1.properties SalesForceUploadTest.properties
cp SalesForceUploadTest1.properties SalesForceUploadTest.properties

but I am getting the following error
mv: cannot access SalesForceUploadTest1.properties
cp: cannot access SalesForceUploadTest1.properties

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You can write to the same file with perl :
perl -p -i -e "s@salesforcefile=.*@salesforcefile=/opt/AMS/eINcent/live/in/$1@g" file

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