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脚本添加的 cron 任务不执行，要运行 crontab -e 保存一次才行。
source link: https://www.v2ex.com/t/805504
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脚本添加 cron 内容如下，用户名为 test
#!/bin/bash
USER=test
sudo tee -a /var/spool/cron/crontabs/$USER >/dev/null <<'EOF'
*/5 * * * * echo a >> /tmp/test.txt
EOF
sudo chown -R $USER:crontab "/var/spool/cron/crontabs/$USER"
这里添加后即使 cron 服务已经启动，但还是不执行，要用户运行 crontab -e 保存一次才行
是添加的方法不对吗？
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