Bash Script with smartctl not working

Question

I am pretty new to bash scripting, but I upon setting up a NAS with FreeNAS I found that the GUI has no default implementation for logging HDD temperatures, so I tried to set up a bash script that would log temps to a file and run as a cron job. What I ended up piecing together looks very messy, but works when run as a script from the console.

HDDtemps.sh:

#!/bin/bash --
PATH=$PATH:/tmp:/usr/local/sbin
printf '%s %s %s %s %s\n' $(echo -n $(date +"%b %d %T")) ' :: ada0 Temperature Celsius =   ' $(echo $(smartctl -A /dev/ada0 | grep Temperature_Celsius) | awk '{print $10}') >> temperatures.txt
printf '%s %s %s %s %s\n' $(echo -n $(date +"%b %d %T")) ' :: ada1 Temperature Celsius =   ' $(echo $(smartctl -A /dev/ada1 | grep Temperature_Celsius) | awk '{print $10}') >> temperatures.txt
exit;

When executed by cron however, the file is created and is printed into, but only

Feb 17 19:22:00 :: ada0 Temperature Celsius =

is written to the file, the temperature is does not appear. I am not sure what I am doing wrong here, and I would appreciate any help.

Thanks!

EDIT:

The cronjob is

* * * * * sh /path/to/HDDtemps.sh

Answer 1

也许，验证smartctl二进制文件是否存在于/ usr / sbin /中，并在cronjob运行的脚本中为smartctl指定绝对路径/ usr / sbin / smartctl ，因此将smartctl替换为/ usr / sbin / smartctl 。