不确定发生了什么，因为这个 cronjob 非常简单。我希望我的 cronjob 每 5 分钟运行一次。下面是整个脚本（memory.sh）。
下面是通过 crontab 要求运行的时间表。
我已经复制了 crontab 并crontab memory.sh在我的用户名和 root 下运行，但每次我得到相同的错误：
"/opt/memory.sh":4: bad minute
errors in crontab file, can't install.
内存.sh
#!/bin/bash
now=`date +%Y-%m-%d.%H:%M:%S`
echo "$now" >>/opt/memory.out
ps aux --sort -rss>> /opt/memory.out
echo "$now" >>/opt/memory_free.out
free -m>> /opt/memory_free.out
crontab
# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
#
# For more information see the manual pages of crontab(5) and cron(8)
#
# m h dom mon dow command*
*/5 * * * * /opt/memory.sh
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