Functions for fixed length data or records in perl

* pack - convert a list into a binary representation
* read - fixed-length buffered input from a filehandle
* syscall - execute an arbitrary system call
* sysread - fixed-length unbuffered input from a filehandle
* sysseek - position I/O pointer on handle used with sysread and syswrite
* syswrite - fixed-length unbuffered output to a filehandle
* unpack - convert binary structure into normal perl variables
* vec - test or set particular bits in a string

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• Perl