linux + run find command with parameter

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http://unix.stackexchange.com – when I run find command , to search files with perl name , then I able to find them: find /tmp -name '*perl*' /tmp/perl.pl /tmp/run-perl-stage.pl . but when I set the perl name in PARAMETER and run again the find command then I not get any results ? how to run the find command with $PARAMETER ? PARAMETER=perl find /tmp -name '*$PARAMETER*' not get any results find /tmp -name '*\$PARAMETER*' not get any results (HowTos)