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I have installed samtools under my folder of choice. Also there is another different version of samtools present in /usr/local/bin/samtools I installed under my choice of folder latest version of samtools.

When I use which samtools I get

/usr/local/bin/samtools

How can I permanently use only that release of samtools which I have installed? Do I need to delete /usr/local/bin/samtools and then use export PATH=$PATH:/path/to/my/folder

Thanks

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There is no need to delete /usr/local/bin/samtools. If you add /path/to/your/folder so that it precedes /usr/local/bin/samtools, it will take precedence and will show up when issuing the which samtools command.

export PATH=/path/to/your/folder:$PATH

This will preserve the original samtools which can still be called by absolute path, if necessary.

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