If I use this
如果我用这个
cmd 2>/var/error.log
Then my error goes to that file but then I can't see on screen.
然后我的错误进入了那个文件，但是我在屏幕上看不到。
Is there any way I can simultaneously show it on screen as well as send to file?
有没有什么方法可以同时显示在屏幕上，同时发送到文件?
2 个解决方案
#1
3
This will display both stdout and stderr on the terminal while only sending stderr to err.log:
这将在终端上显示stdout和stderr，同时只将stderr发送到error .log:
cmd 2> >(tee err.log >&2)
>(...) is process substitution. (The space between the two consecutive > is essential.) This sends stderr and only stderr to the tee command.
>(…)进程替换。(两个连续>之间的空间是必不可少的。)这将发送stderr和唯一的stderr到tee命令。
The >&2 causes the error messages remain in stderr. This would be important, for example, if this line occurs inside some script whose stdin or stderr is being redirected. (Hat tip: Chepner.)
>和2导致错误消息保持在stderr中。这一点很重要，例如，如果这一行发生在某个脚本中，该脚本的stdin或stderr正在被重定向。(提示:帽子Chepner)。
#2
0
cmd 2>&1 | tee /tmp/error.log
#1
3
This will display both stdout and stderr on the terminal while only sending stderr to err.log:
这将在终端上显示stdout和stderr，同时只将stderr发送到error .log:
cmd 2> >(tee err.log >&2)
>(...) is process substitution. (The space between the two consecutive > is essential.) This sends stderr and only stderr to the tee command.
>(…)进程替换。(两个连续>之间的空间是必不可少的。)这将发送stderr和唯一的stderr到tee命令。
The >&2 causes the error messages remain in stderr. This would be important, for example, if this line occurs inside some script whose stdin or stderr is being redirected. (Hat tip: Chepner.)
>和2导致错误消息保持在stderr中。这一点很重要，例如，如果这一行发生在某个脚本中，该脚本的stdin或stderr正在被重定向。(提示:帽子Chepner)。
#2
0
cmd 2>&1 | tee /tmp/error.log