备份数据库使用带日期功能的crontab-Backupdatabaseusecrontabwithdatefunction

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% signs in a crontab command are converted to newlines, and all data after the first % is sent to the command's stdin. Replace each % with \%.

crontab命令中的%符号将转换为换行符,并将第一个%之后的所有数据发送到命令的stdin。用\%替换每个%。

(And you only had 4 time fields: * * * *; you need 5 (you later fixed the question).)

(你只有4个时间段:* * * *;你需要5个(你后来修复了这个问题)。)

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From the man 5 crontab:

从男人5 crontab:

The ``sixth'' field (the rest of the line) specifies the command to be run.

“第六”字段(行的其余部分)指定要运行的命令。

The entire command portion of the line, up to a newline or % character, will be executed by /bin/sh or by the shell specified in the SHELL variable of the crontab file.

该行的整个命令部分,直到换行符或%字符,将由/ bin / sh或crontab文件的SHELL变量中指定的shell执行。

Percent-signs (%) in the command, unless escaped with backslash (), will be changed into newline characters, and all data after the first % will be sent to the command as standard input. There is no way to split a single command line onto multiple lines, like the shell's trailing "\".

除非使用反斜杠()进行转义,否则命令中的百分号(%)将更改为换行符,并且第一个%之后的所有数据将作为标准输入发送到命令。无法将单个命令行拆分为多行,例如shell的尾部“\”。