[英]Need to append output from the python script to the file
I'm trying to write a simple shell
script to start and stop my python script. 我正在尝试编写一个简单的
shell
脚本来启动和停止我的python脚本。 The reason I'm doing this is because I want to use tool called monit
to monitor processes and I also would need to be sure that this script is running. 我这样做的原因是因为我想使用名为
monit
工具来监视进程,并且还需要确保此脚本正在运行。 So here is my python script: 所以这是我的python脚本:
import time
for i in range(100):
time.sleep(1)
print 'a'*i
and here is my shell script: 这是我的shell脚本:
#! /bin/bash
PIDFILE=/home/jhon/workspace/producer/wrapper_test.pid
case $1 in
start)
echo $$ > ${PIDFILE};
exec /usr/bin/python /home/jhon/workspace/producer/test.py 1>&2 output
;;
stop)
kill `cat ${PIDFILE}`
;;
*)
echo "Usage: wrapper {start|stop}"
;;
esac
exit 0
The result that I want is lets say I do tail -f output
and I would see staff coming to the file. 我想要的结果是说我执行
tail -f output
并且我会看到工作人员进入该文件。 I also tried to change 1>&2
to just >
but this creates file, and once I press Ctrl + C
than all the data appends to the file. 我还尝试将
1>&2
更改为>
但这会创建文件,一旦按Ctrl + C
,所有数据都会追加到文件中。
But right now, I dont see anything 但是现在,我什么都没看到
For append (you never want to cut the file), use >>
; 对于追加(您永远不想剪切文件),请使用
>>
; to get the stderr too, use 2>&1 要也获得标准错误,请使用2>&1
exec /usr/bin/python /home/jhon/workspace/producer/test.py >> output 2>&1
and 和
import time
import sys
for i in range(100):
time.sleep(1)
sys.stdout.write('a'*i)
sys.stdout.flush()
用> output 2>&1
替换1>&2 output
:
exec /usr/bin/python /home/jhon/workspace/producer/test.py > output 2>&1
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