I don't think it's a perl problem:
Your semicolon is interpreted as command delimiter by the shell. You should consider either quoting or escaping "twice"!
DB<1> print `echo '\;'`
;
DB<2> print `echo \;`
DB<3> print `echo \\;`
;
DB<4> print `echo ';'`
;
DB<5> print `echo '\\'`
\
To be more precise you have to escape the backslash for perl not the semicolon, such that the shell finally sees an escaped semicolon \;. As you can see by comparing line 1 and 4 escaping the semicolon has no effect for perl!
\; and ; are identical, since there is no special meaning like for \n
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