ctrlz(2m)ctrlz - File's termination style
ctrlz Mode
z - mode line letter.
When enabled ctrlz indicates that an MS-DOS style 'ctrl-z' file termination character should be written out. When clear, a UNIX style of no termination character should be used.
This mode only effects the style in which the buffer is written if auto(2m) mode is enabled.
Ref: ctrlz(2m) File: m2mod030.2 Date: 2022/06/12
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