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Operation Syntax Description
Read open(INFILE,"<filename"); Read from the file.
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, "+<filename"); Read and write from an existing file.
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.
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