Reg : linux 1n -f command

Hi,

 My friend has this below problem.

Can anyone please let me know the complete functionality of ln - f command.
When used in this way ,

For example , statement like this
 ln -f $EUAP_TOP/sql/HWAPREMO.sql $AP_TOP/sql/HWAPREMO.sql
is deleting the file in $AP_TOP/sql directory.

Waiting for your kind reply.

Thanks.
Ann

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