Batch File Redirection

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本文详细介绍了命令行中各种重定向操作的使用方法，包括标准输出、标准错误的重定向到文件、设备，以及从文件读取输入等。此外还列举了一些常用的重定向示例，如将输出隐藏或发送到打印机。

Redirection

Commands	Description
command > file	Write standard output of command to file
command 1> file	Write standard output of command to file (same as previous)
command 2> file	Write standard error of command to file (OS/2 and NT)
command > file 2>&1	Write both standard output and standard error of command to file (OS/2 and NT)
command >> file	Append standard output of command to file
command 1>> file	Append standard output of command to file (same as previous)
command 2>> file	Append standard error of command to file (OS/2 and NT)
command >> file 2>&1	Append both standard output and standard error of command to file (OS/2 and NT)
commandA \| commandB	Redirect standard output of commandA to standard input of commandB
commandA 2>&1 \| commandB	Redirect standard output and standard error of commandA to standard input of commandB (OS/2 and NT)
command < file	command gets standard input from file
command 2>&1	command’s standard error is redirected to standard output (OS/2 and NT)
command 1>&2	command’s standard output is redirected to standard error (OS/2 and NT)

Notes:
(1) Where the table mentions redirection to a file you may also use redirection to a device. Redirection from a device is not always possible.
(2) Redirection to the NUL device is often used to hide standard output, instead of displaying it on screen:
COPY *.* A: > NUL
Another frequently used redirection is redirection to a parallel port to print standard output:
DIR > LPT1

For details, please go to http://www.robvanderwoude.com/redirection.php