如何从脚本中的“ killall”命令捕获所有输出？

Question

I originally had a 'killall' command redirect the output to a file and got this on three separate runs:

No matching processes belonging to you were found
kill -TERM 7370
No matching processes belonging to you were found

I wanted a timestamp, so I changed my script to this:

d=$(date "+%Y-%m-%d %H:%M:%S : ")
r=$(killall osascript 2>&1)
echo "$d$r"
exit 0

and now I get this (three separate runs):

2017-08-18 16:14:01 : No matching processes belonging to you were found
2017-08-18 16:29:01 :
2017-08-18 16:44:02 : No matching processes belonging to you were found

This is missing the kill -TERM nnnn detail.

How do I capture all the output?

Thanks.

Answer 1

You can use the option -v, --verbose in order to list the processes which received the issued signal. (See man killall )

-v, --verbose

Report if the signal was successfully sent.

Hence, your script should look like this:

#!/bin/bash
d=$(date "+%Y-%m-%d %H:%M:%S : ")
r=$(killall -v osascript 2>&1)
echo "$d$r"
exit 0

Replacing osascript with sleep gives me the following output:

2017-08-21 17:14:30 : Killed sleep(12493) with signal 15