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lang-bash
ifstatement is executing the contents of the variable which is the Bash builtintrue. Any command could be set as the value of the variable and its exit value would be evaluated.&&and||operators:# t1=true; t2=true; f1=false;#if $t1 || $f1; then echo is_true ; else echo is_false; fi;(returns "true", since t1=true) #if $t1 && $f1 || $t2; then echo is_true ; else echo is_false; fi(returns "true", since t2=true) . Again, this ONLY works because "true"/"false" are bash-builtins (returning true/false). You can't use "if $var..." unless var is a cmd (ie, true or false)