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Setting the path permanently using shell script

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linux-howto

http://www.unix.com – I'm trying to set the path permanently through a shell script. (/opt/quest/bin:/usr/bin/lab to /.profile.) I tired using echo option like below but it doesn't work. Please suggest me the right way to do so. echo "PATH=$PATH:/opt/quest/bin:/usr/bin/lab" >> /.profile (HowTos)