crontab当中运行命令包含特殊字符的bug

Problem & Summary

• 发现搞了半天都无法在crontab当中执行成功；而直接运行是OK的

/usr/bin/docker exec -it calibre-web /bin/bash -c "cp /books/metadata.db /books/metadata_$(date +'%Y_%m_%d_%H_%M').db && calibredb add --library-path=/books -r /books/_new2add/; rm -rf /books/_new2add/*" >> /var/log/calibre-web-addbook.log 2>&1

• 查看了日子 journalctl -f -u cron

• 看起来是当中的 && 符号被cron给切掉了

Soltion

把需要运行的命令放到script当中

cat > /root/calibre-web-refresh.sh <<EOF
#!/bin/bash
PATH=/opt/someApp/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
/usr/bin/docker exec calibre-web /bin/bash -c "cp /books/metadata.db /books/metadata_$(date +'%Y_%m_%d_%H_%M').db && calibredb add --library-path=/books -r /books/_new2add/; rm -rf /books/_new2add/*"
EOF

chmod +x /root/calibre-web-refresh.sh

*/15 * * * * /root/calibre-web-refresh.sh >> /var/log/calibre-web-addbook.log 2>&1

Screenshots