sto*_*ord 5 shell bash ksh pipe
我想在发生任何故障(包括管道内部故障)时终止脚本。在bash中,你可以set -eo pipefail,但这在 ksh 中不起作用。
例子:
\n\n# x\nset -eo pipefail\nfalse | true\necho "done: $?" # reached in ksh, unexpected\nfalse\necho "done2" # not reached in either shell, as expected\nRun Code Online (Sandbox Code Playgroud)\n\nbash x # prints nothing, as expected\nksh x # done: 1\nksh --version # ... 93u+ 2012-08-01\nRun Code Online (Sandbox Code Playgroud)\n\n为什么 ksh 在这种情况下不会退出?
\n\n编辑:添加另一个测试
\n\n我将其与其他 shell 进行了比较,得到了不同的结果:
\n\n-bash-5.0$ zsh -c \'set -eo pipefail; false | true; exit 2\' ; echo $?\n1\n-bash-5.0$ ksh -c \'set -eo pipefail; false | true; exit 2\'; echo $?\n2\n-bash-5.0$ bash -c \'set -eo pipefail; false | true; exit 2\' ; echo $?\n1\nRun Code Online (Sandbox Code Playgroud)\n\n除了 ksh 中的错误之外,我不明白是什么导致了这种行为。根据 man ksh 的说法:
\n\n-e Unless contained in a \xe2\x8e\xaa\xe2\x8e\xaa or && command, or the command\n following an if while or until command or in the\n pipeline following !, if a command has a non-zero exit # Pipeline does not follow !\n status, execute the ERR trap, if set, and exit. This # Pipeline has a non-zero exit status\n mode is disabled while reading profiles.\n\npipefail\n A pipeline will not complete until all\n components of the pipeline have completed, and\n the return value will be the value of the last\n non-zero command to fail or zero if no command\n has failed.\nRun Code Online (Sandbox Code Playgroud)\n
它看起来像是 ksh93u+ 引入的回归。ksh93u 在这方面按预期工作(以及 zsh、bash、mksh、yash 和 busybox sh)。
我刚刚在https://github.com/ksh93/ksh/issues/121提出了这个问题
现已修复https://github.com/ksh93/ksh/commit/c049eec854d506ad6110eb50c769b10224c60075,自 v1.0.0-beta.1 起包含