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cat: should error when appending to input file redirected to stdin but doesn't #7165

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jfinkels opened this issue Jan 19, 2025 · 0 comments
Open

cat: should error when appending to input file redirected to stdin but doesn't #7165

jfinkels opened this issue Jan 19, 2025 · 0 comments
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U - cat

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@jfinkels
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Environment: Ubuntu 20.04, uutil main branch (git commit d39dcad), GNU coreutils v9.6.3-3189c-dirty.

Steps to reproduce:

touch f && cat <f >>f

What happens now: uutils cat succeeds with no output.

What I expected to happen: GNU cat terminates with an error message:

cat: -: input file is output file

Notes: this is causing a failure in the GNU test file tests/cat/cat-self.sh.
@jfinkels jfinkels changed the title cat: should error when appending to input file but doesn't cat: should error when appending to input file redirected to stdin but doesn't Jan 19, 2025
@sylvestre sylvestre mentioned this issue Jan 19, 2025
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