1 03/09/76 input
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 3 Function:  provides a convenient way to enter numbered lines. See Notes.
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 6 Syntax:  input {new_number} {increment}
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 9 Arguments:
10 new_number   number of the first new line; if omitted, lines are
11 entered at the end of the temporary text.
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13 increment   increment of subsequent line numbers (default is 10).
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16 Notes:
17 When this command is invoked, the system types the line number and one
18 space.  The user completes the line.  This input mode is terminated when
19 the user types a newline character without having typed any other
20 character on the line.
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23 If the number given with the input command or a number generated by
24 the input request already exists or would cause the temporary text
25 to be out of sequence, an error message is printed and the user
26 is returned to command level.