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Re: Next steps for /bin/sh
Date: Mon, 29 Feb 2016 12:45:03 +0700
From: Robert Elz <kre%munnari.OZ.AU@localhost>
Date: Sun, 28 Feb 2016 17:11:17 -0500
From: "James K. Lowden" <jklowden%schemamania.org@localhost>
| IMO, in the presence of -e, "false && false" should terminate
| execution, just as "false && true" should. The entire compound
| statement is false because the first one is.
No, it shouldn't. [...]
If it had been that simple, it would be easy, but that doesn't do what
anyone wants if the script is something like
if [ -z "$1" ]; then
# more stuff here
as if the test fails ($1 is not empty) then the test ('[') command
exits with non-zero status, then the 'more stuff' would never be done.
I think all that James meant was that when executing `false && false'
or `false && true' as a top-level command, that whole `&&' term should
return nonzero -- and hence cause the script to fail as a top-level
command -- because the first subterm, `false', returns nonzero.
Of course, if it weren't in a top-level command, e.g. if it were in
the condition of an `if', then it would only cause the alternative
branch of the `if' to be taken, &c.
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