| Jari Aalto | d166f04 | 1997-06-05 14:59:13 +0000 | [diff] [blame] | 1 | minus=- |
| 2 | |||||
| 3 | # standard input | ||||
| 4 | fd=0 | ||||
| 5 | |||||
| 6 | exec 3<&$fd | ||||
| 7 | |||||
| 8 | read line <&3 | ||||
| 9 | echo from stdin: $line | ||||
| 10 | |||||
| 11 | # close fd 3 | ||||
| 12 | exec 3<&${minus} | ||||
| 13 | |||||
| 14 | # should give `bad fd', but exact error messages vary | ||||
| 15 | # read line <&3 | ||||
| 16 | |||||
| 17 | # standard output | ||||
| 18 | fd=1 | ||||
| 19 | |||||
| 20 | exec 4>&$fd | ||||
| 21 | |||||
| 22 | echo to stdout >&4 | ||||
| 23 | |||||
| 24 | exec 4>&$minus | ||||
| 25 | |||||
| 26 | # should give `bad fd', but exact error messages vary | ||||
| 27 | # echo to stdout >&4 | ||||
| 28 | |||||
| 29 | unset fd | ||||
| 30 | |||||
| 31 | # these are ambiguous redirects | ||||
| 32 | exec 3<&$fd | ||||
| 33 | exec 4>&$fd | ||||
| 34 | |||||
| 35 | exec 3>&1 4>&2 | ||||
| 36 | |||||
| 37 | exec >&/tmp/err-and-out | ||||
| 38 | echo to stdout | ||||
| 39 | echo to stderr >&2 | ||||
| 40 | |||||
| 41 | exec 1>&3 2>&4 | ||||
| 42 | echo /tmp/err-and-out: | ||||
| 43 | cat /tmp/err-and-out | ||||
| 44 | |||||
| 45 | rm /tmp/err-and-out | ||||
| 46 | |||||
| 47 | fd=/tmp/err-and-out | ||||
| 48 | exec >&$fd | ||||
| 49 | echo to stdout | ||||
| 50 | echo to stderr >&2 | ||||
| 51 | |||||
| 52 | exec 1>&3 2>&4 | ||||
| 53 | echo /tmp/err-and-out: | ||||
| 54 | cat /tmp/err-and-out | ||||
| 55 | |||||
| 56 | rm /tmp/err-and-out | ||||