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| 1 | minus=-
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| 2 |
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| 3 | # standard input
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| 4 | fd=0
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| 5 |
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| 6 | exec 3<&$fd
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| 7 |
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| 8 | read line <&3
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| 9 | echo from stdin: $line
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| 10 |
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| 11 | # close fd 3
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| 12 | exec 3<&${minus}
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| 13 |
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| 14 | # should give `bad fd', but exact error messages vary
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| 15 | # read line <&3
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| 16 |
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| 17 | # standard output
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| 18 | fd=1
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| 19 |
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| 20 | exec 4>&$fd
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| 21 |
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| 22 | echo to stdout >&4
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| 23 |
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| 24 | exec 4>&$minus
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| 25 |
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| 26 | # should give `bad fd', but exact error messages vary
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| 27 | # echo to stdout >&4
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| 28 |
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| 29 | unset fd
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| 30 |
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| 31 | # these are ambiguous redirects
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| 32 | exec 3<&$fd
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| 33 | exec 4>&$fd
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| 34 |
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| 35 | exec 3>&1 4>&2
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| 36 |
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| 37 | exec >&/tmp/err-and-out
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| 38 | echo to stdout
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| 39 | echo to stderr >&2
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| 40 |
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| 41 | exec 1>&3 2>&4
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| 42 | echo /tmp/err-and-out:
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| 43 | cat /tmp/err-and-out
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| 44 |
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| 45 | rm /tmp/err-and-out
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| 46 |
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| 47 | fd=/tmp/err-and-out
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| 48 | exec >&$fd
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| 49 | echo to stdout
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| 50 | echo to stderr >&2
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| 51 |
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| 52 | exec 1>&3 2>&4
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| 53 | echo /tmp/err-and-out:
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| 54 | cat /tmp/err-and-out
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| 55 |
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| 56 | rm /tmp/err-and-out
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|---|
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