如何在 Linux 系统中为特定用户添加 Cron 作业
linuxoperating systemsoftware & coding
本文将教您如何安排 Cron 作业在一天中的特定时间执行。
Cron 作业的常规语法
MIN HOUR Day of month Month Day of Week Command 0-59 0-23 1-31 1-12 0-6 linux command or script
要查看计算机上现有的 cron 任务列表，请运行以下命令
# crontab -u test1 -l no crontab for test1
要将新的 cron 任务添加到 Test1 用户，请运行以下命令
#crontab -u test1 -e no crontab for test1 - using an empty one Select an editor. To change later, run 'select-editor'. /bin/ed /bin/nano <---- easiest /usr/bin/vim.basic /usr/bin/vim.tiny Choose 1-4 [2]:2 # 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
为其他用户安排作业
cron 的基本用法是在特定时间执行作业，如下所示。这将在每天上午 9 点和下午 6 点执行完整备份 Shell 脚本 (backup_files.sh)
00 09-18 * * * /home/test1/backup_files.sh
解释
00 – 00th Minute 09-18 – 09 AM & 06:00PM * --Every day of the Month * -- Every Month. * --Every day of the week
结论
配置完成后，您应该能够每天在特定时间以特定用户身份运行脚本或命令。这样，我们可以为任何用户指定Cron任务。这类Cron通常用于备份用户数据，例如桌面、下载等。
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有用资源
linux 参考教程 - 该教程包含有关 linux 的更多信息:https://www.cainiaomax.com/linux/
