File Perl

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Operation              Syntax                               Description
Read                   open(INFILE,"Write                  open(OUTFILE, ">filename");          Destroy any existing file and write to a new file.
Append                 open(APP, ">>filename");             Write to the end of an existing file.
Read/write             open(RW, "+Write to a program     open(PIPEOUT, "|filename");          Send data to a program or command. Also called opening a program pipe.
Read from a program    open(PIPEIN"filename|");             Receive data from a program or command.