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2009-05-13 01:53:47来源：未知阅读 ()

ECHO(1)
               NetBSD General Commands Manual                ECHO(1)
NAME
   echo -- 将参数写到标准输出
SYNOPSIS
   echo [-n] [string ...]
DESCRIPTION
   echo 程序将输入的以空格隔开、以换行结束的任何参数写到标准输出。
   有如下选项：
   -n 不打印结尾的换行符。
EXIT STATUS
   echo 返回0表示成功，返回>0表示错误。
SEE ALSO

printf(1)
STANDARDS
   echo 程序符合 IEEE Std 1003.2 (``POSIX.2'') 标准。
NetBSD 3.0                      July 22, 1993                   NetBSD 3.0
1  /* $NetBSD: echo.c,v 1.15 2003/11/25 03:40:18 simonb Exp $  */
2
3  /*
4   * Copyright (c) 1989, 1993
5   *  The Regents of the University of California.  All rights reserved.
6   *
7   * Redistribution and use in source and binary forms, with or without
8   * modification, are permitted provided that the following conditions
9   * are met:
10   * 1. Redistributions of source code must retain the above copyright
11   * notice, this list of conditions and the following disclaimer.
12   * 2. Redistributions in binary form must reproduce the above copyright
13   * notice, this list of conditions and the following disclaimer in the

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