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shtests: fix loose ends
src/cmd/ksh93/tests/variables.sh: - Tolerate a bit more time for the SECONDS verification test. src/cmd/ksh93/tests/subshell.sh: - Replace unportable 'head -c 1' by 'dd bs=1 count=1' - Remove unnecessary uses of 'whence'. src/cmd/ksh93/tests/builtins.sh: - Add a regression test for a weirdly specific 'whence' bug exposed by the aforementioned unneccessary uses of 'whence', which only shows up on my old Power Mac G5 running Mac OS X 10.3. For all I know it's a compiler bug, but let's add a more clear failure for it here, in case that happens anywhere else. (cherry picked from commit c3898bd1e6e40874845771d33a5b37220ef0b06e)
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3 changed files with 9 additions and 3 deletions
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@ -679,5 +679,12 @@ expect=$'*: times: incorrect syntax'
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actual=$(set +x; eval 'times Extra Args' 2>&1)
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[[ $actual == $expect ]] || err_exit "times with args: expected $(printf %q "$expect"), got $(printf %q "$actual"))"
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# ======
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# 'whence' builtin
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PATH=$tmp:$PATH $SHELL <<-\EOF || err_exit "'whence' gets wrong path on init"
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wc=$(whence wc)
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[[ -x $wc ]]
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EOF
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# ======
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exit $((Errors<125?Errors:125))
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