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artyom@art:~> test=''
artyom@art:~> if [ $test ]; then echo 'true'; fi;
artyom@art:~> if [ $test -a $test != false ]; then echo 'true'; fi;
true
artyom@art:~> test=true
artyom@art:~> if [ $test -a $test != false ]; then echo 'true'; fi;
true
artyom@art:~> test=false
artyom@art:~> if [ $test -a $test != false ]; then echo 'true'; fi;
artyom@art:~>
A
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