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posix: re-allow preset aliases on interactive (re: ddaa145b)

The POSIX standard in fact contains a sentence that specifically
allows preset aliases: "Implementations also may provide predefined
valid aliases that are in effect when the shell is invoked."
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03_01

I had missed that back then. It's still a terrible idea for scripts
(particularly the way 93u+ implemented them), but for interactive
POSIX shells it makes a lot more sense and does not violate POSIX.

src/cmd/ksh93/sh/main.c: sh_main():
- Preset aliases for interactive shell regardless of SH_POSIX.
This commit is contained in:
Martijn Dekker 2022-06-09 21:50:26 +01:00
parent b14e79e9d0
commit 4f9456d69f
3 changed files with 9 additions and 14 deletions

3
NEWS
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@ -11,6 +11,9 @@ Any uppercase BUG_* names are modernish shell bug IDs.
<##pattern redirection operators will not work and the -n option to the
read built-in will not return early when reading from a slow device.)
- An interactive shell initialized in POSIX mode now once again has the
preset aliases defined. This amends a change made on 2020-09-11.
2022-06-08:
- If -B/--braceexpand is turned on in --posix mode, it now only allows brace