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3.7.5 Commands and Functions for IO
The following are commands and functions for input/output:
Block group several commands into a single command
Close close a device
CloseLog close a log of a CoCoA session
Format convert object to formatted string
Get read characters from a device
IO.SprintTrunc convert to a string and truncate
Latex LaTeX formatting
More print a string, N lines at a time
OpenIFile open input file
OpenIString open input string
OpenLog open a log of a CoCoA session
OpenOFile open output file
OpenOString open output string
OpenSocket open a socket connection
Print print the value of an expression
Print On print to an output device
PrintLn print the value of an expression
Source read commands from a file or device
Sprint convert to a string
Tag returns the tag string of an object
Tagged tag an object for pretty printing
Untagged untag an object

For details look up each item by name. Online, try ?ItemName or H.Syntax("ItemName").