We can execute the script directly, but using cron has no effect. If you check the log (/ var/log/cron), an error will be reported by orphan (no passwd entry)

Reason: environment variable

Solution

1. All commands need to be written in absolute path form, such as:/usr/local/bin/docker.

2. Use the following code at the beginning of the shell script:

#!/bin/sh

. /etc/profile
. ~/.bash_profile

3. Add environment variables in/etc/crontab, and add the command./etc/profile before the executable command/ Bin/sh to make the environment variable effective, for example:

20 03 * * * . /etc/profile;/bin/sh /var/www/runoob/test.sh

“21442;” “32771;”https://www.runoob.com/linux/linux-comm-crontab.html