Reference/StrCmp
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StrCmp
str1 str2 jump_if_equal [jump_if_not_equal]
Compares (case insensitively) str1 to str2. If str1 and str2 are equal, Gotos jump_if_equal, otherwise Gotos jump_if_not_equal.
StrCmp $0 "a string" 0 +3 DetailPrint '$$0 == "a string"' Goto +2 DetailPrint '$$0 != "a string"'
Command introduced with NSIS v1.2g
