Environment of redirections

• 回報者: magicant
• 負責人: magicant
• 類型: 問題回報
• 狀態: 關閉
• 元件: shell-main
• 里程碑: (無)
• 優先權: 5 - 中
• 嚴重程度: 5 - 中
• 處理結果: 修正
• 檔案: 無

細節 回覆

XCU 2.9.1 says:

If there is no command name, any redirections shall be performed in a subshell environment

This means:

• Such a redirection should not cause the shell to exit on error.
• Assignments in such a redirection does not survive.

Currently, the latter is not implemented in yash (and the former may or may not be well tested).

Test case:

unset x
< ${x=/no/such/file}
echo $x

Ticket History (3/4 Histories)

2020-10-07 21:29 Updated by: magicant

• New Ticket "Environment of redirections" created

2020-11-03 22:21 Updated by: magicant

評語 回覆

Test added in r4139

2020-11-03 23:53 Updated by: magicant

評語 回覆

POSIX does not specify which of assignments and redirections should be done first when there is no command name in a simple command. However, should the redirections be performed in a subshell, assignments need to be performed before the subshell is forked.

2020-11-05 21:00 Updated by: magicant

• 處理結果 Update from 無 to 修正
• 狀態 Update from 開啟 to 關閉

評語 回覆

Fixed in r4141, r4142, and r4143