# /etc/crontab: system-wide crontab# Unlike any other crontab you don't have to run the `crontab'# command to install the new version when you edit this file# and files in /etc/cron.d. These files also have username fields,# that none of the other cr…
at一次性计划任务 格式: at + 时间 命令 安装at # yum install at -y 如果执行at命令时,出现一下情况 Can't open /var/run/atd.pid to signal atd. No atd running? 解决办法: # chkconfig --level 35 atd on # service atd start 普通用户也能够做计划任务 at+未来时间 # at 2018-11-11 Ctrl + d结束所要添加执行的命令 24进制的时间 # a…