我看不太明白这个exec的意思

ccic

我看不太明白这个exec的意思

我看不太明白这个exec的意思
请版主大哥给我说一说吧~
我知道你的英语好强的！帮我翻译一下吧！
谢谢了~
exec [-cl] [-a name] [command [arguments]]
If command is specified, it replaces the shell. No new process
is created. The arguments become the arguments to command. If
the -l option is supplied, the shell places a dash at the begin-
ning of the zeroth arg passed to command. This is what login(1)
does. The -c option causes command to be executed with an empty
environment. If -a is supplied, the shell passes name as the
zeroth argument to the executed command. If command cannot be
executed for some reason, a non-interactive shell exits, unless
the shell option execfail is enabled, in which case it returns
failure. An interactive shell returns failure if the file can-
not be executed. If command is not specified, any redirections
take effect in the current shell, and the return status is 0.
If there is a redirection error, the return status is 1.

如果命令是指定的，那么它将代替shell。不创建新的进程。这个命令将变成那个命令。

我想我翻译的不对劲吧！ 请大家帮帮忙吧！

Freebird

如果在exec后指定了命令,就替换当前shell进程,而不开启新的进程.
eg:[php]
#!/bin/bash
echo "This line appears ONCE in the script,yet it keep echoing."
echo "The PID of this instance of the script is still $$."

# Demonstrate that a subshell is not forked off.
echo "==============Hit Ctrl-C to exit================"
sleep 1

exec $0
echo "This line will never echo!"

exit 0
[/php]

ccic

谢谢版主

你写的东东我放在SHELL下试了
太神奇了  
我应该怎么学习啊   才能了解到shell程序的编写啊

有没有中文的入门教程啊
请给我几个行吗？
谢谢
谢谢版主先生

Freebird

Post by ccic
谢谢版主

你写的东东我放在SHELL下试了
太神奇了  
我应该怎么学习啊   才能了解到shell程序的编写啊

有没有中文的入门教程啊
请给我几个行吗？
谢谢
谢谢版主先生

书籍自己去书店买,怎么学这个问题,因人而异.买本好书,从头看到尾.再从尾看到头 如果不要用,学了也没什么用.

DSL

楼主是马甲

ccic

楼主是马甲

你在说什么

DSL

我看不太明白这个exec的意思

我看不太明白这个exec的意思
请版主大哥给我说一说吧~
我知道你的英语好强的！帮我翻译一下吧！
谢谢了~
exec [-cl] [-a name] [command [arguments]]
If command is specified, it replaces the shell. No new process
is created. The arguments become the arguments to command. If
the -l option is supplied, the shell places a dash at the begin-
ning of the zeroth arg passed to command. This is what login(1)
does. The -c option causes command to be executed with an empty
environment. If -a is supplied, the shell passes name as the
zeroth argument to the executed command. If command cannot be
executed for some reason, a non-interactive shell exits, unless
the shell option execfail is enabled, in which case it returns
failure. An interactive shell returns failure if the file can-
not be executed. If command is not specified, any redirections
take effect in the current shell, and the return status is 0.
If there is a redirection error, the return status is 1.

如果命令是指定的，那么它将代替shell。不创建新的进程。这个命令将变成那个命令。

我想我翻译的不对劲吧！ 请大家帮帮忙吧！
from: http://bbs.chinaunix.net/forum/v ... 9155&show_type=