Update of bug #61070 (project groff):
Status: Need Info => In Progress
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Follow-up Comment #5:
Unix Version 7 nroff said exactly "User Abort." if .ab was given no arguments,
and exited _with status zero_ (shame! SHAME!).
PDP-11 simulator V3.8-1
sim> set cpu 11/45
Disabling XQ
sim> set tto 7b
sim> att rl unix_v7_rl.dsk
sim> boot rl
@boot
New Boot, known devices are hp ht rk rl rp tm vt
: rl(0,0)rl2unix
mem = 177856
# Restricted rights: Use, duplication, or disclosure
is subject to restrictions stated in your contract with
Western Electric Company, Inc.
Thu Sep 22 06:42:34 EDT 1988
login: dmr
$ nroff
.ab
User Abort.
$ echo $?
0
$ nroff
.ab foo
foo
$ echo $?
0
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