The command 'e' when entered without a filename is supposed to re-read the current file and discard any changes. However, in GNU ed, it quits instead. The ed implementation supplied with Mac OS X Leopard works as expected. See the example below.
GNU ed: $ ed H P *f file file *a some text . *w 10 *e 10 *a more text . *e ? Warning: file modified *e $ Mac OS X Leopard: $ ed H P *f file file *a some text . *w 10 *e 10 *a more text . *e ? warning: file modified *e 10 *1,$p some text *q $
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