What I'm trying to do is:
我想要做的是:
-
Start a process that outputs text continously
启动一个连续输出文本的过程
-
Pipe that output to two commands:
管道输出到两个命令:
- A logger script
- 'head' command, so I can save the first lines the initial process output.
记录器脚本
'head'命令,所以我可以保存初始进程输出的第一行。
What I tried so far (unsuccessfuly) is:
到目前为止我尝试过的(不成功)是:
./myProgram | tee > (myLogger log.txt) | head > firstLines.txt
./myProgram | tee>(myLogger log.txt)| head> firstLines.txt
The problem is that the myProgram exits as soon as head is finished.
问题是,头部完成后myProgram会立即退出。
Even if I use -i in tee command, I can't get myProgram to keep running.
即使我在tee命令中使用-i,也无法让myProgram继续运行。
Since the logger may append the incoming text to an existing file, executing head log.txt > firstLines.txt won't work in this case.
由于记录器可能会将传入的文本附加到现有文件,因此在这种情况下执行head log.txt> firstLines.txt将不起作用。
2 个解决方案
#1
1
You can use awk as an alternative to do both:
您可以使用awk作为两者的替代方法:
./myProgram |
awk 'NR<=10{print > "firstLines.txt"} NR>10{close("firstLines.txt")} 1' > log.txt
#2
1
Like this maybe:
也许这样:
yes | awk 'FNR<4 {print >>"file"; close("file")} 1' | more
where yes is your program, file is where you send the output of head to, and more is your logger.
如果是您的程序,则文件是您将头部输出发送到的位置,更多是您的记录器。
#1
1
You can use awk as an alternative to do both:
您可以使用awk作为两者的替代方法:
./myProgram |
awk 'NR<=10{print > "firstLines.txt"} NR>10{close("firstLines.txt")} 1' > log.txt
#2
1
Like this maybe:
也许这样:
yes | awk 'FNR<4 {print >>"file"; close("file")} 1' | more
where yes is your program, file is where you send the output of head to, and more is your logger.
如果是您的程序,则文件是您将头部输出发送到的位置,更多是您的记录器。