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Perl in a Nutshell

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Function Reference
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sysseek filehandle, offset, whence

A variant of seek() that sets and gets the file's system read/write position using the lseek(2) system call. It's the only reliable way to seek before a sysread() or syswrite(). Returns the new position, or undef on failure. Arguments are the same as for seek.

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Reference: sysreadBook IndexReference: system