How to redirect all commands executed on the bash to /dev/null ?
如何将bash上执行的所有命令重定向到/ dev / null?
It's obvious that for a command we have to do:
很明显,对于我们必须做的命令:
command > /dev/null 2>&1
How about all commands that will be executed further on ?
所有将要执行的命令怎么样?
3 个解决方案
#1
5
Simply start a new shell:
只需启动一个新shell:
bash >/dev/null 2>&1
Now you can type commands blind :) If you want to leave that mode type: exit
现在你可以输入命令blind :)如果你想离开那个模式类型:退出
But typing commands blind will normally not what you want. So I would suggest to create a text file like script.sh, place your commands in it:
但盲目输入命令通常不是你想要的。所以我建议创建一个像script.sh这样的文本文件,将命令放在其中:
command1 foo
command2 bar
and than execute it using:
而不是使用以下方式执行:
bash script.sh >/dev/null 2>&1
The ouput of all commands in that script will be redirected to /dev/null now
该脚本中所有命令的输出现在将重定向到/ dev / null
#2
3
Use exec without a command:
在没有命令的情况下使用exec:
exec > /dev/null 2>&1
As hex2mgl pointed out, if you do this in an interactive shell, you won't even see your prompt anymore, as the shell prints that to standard error. I assume this is intended for a script, as it doesn't make a lot of sense to ignore all output from commands run interactively :)
正如hex2mgl指出的那样,如果你在交互式shell中执行此操作,则甚至不会再看到提示符,因为shell会将其打印到标准错误。我假设这是用于脚本,因为忽略来自交互式运行的命令的所有输出没有多大意义:)
#3
0
for scripting or other practical purpose, grouping the command is a nice solution. check http://www.gnu.org/software/bash/manual/html_node/Compound-Commands.html It says specifically Any redirections (see Redirections) associated with a compound command apply to all commands within that compound command unless explicitly overridden.
对于脚本或其他实际目的,对命令进行分组是一个很好的解决方案。查看http://www.gnu.org/software/bash/manual/html_node/Compound-Commands.html具体说明任何与复合命令相关的重定向(请参阅重定向)都适用于该复合命令中的所有命令,除非明确覆盖。
#1
5
Simply start a new shell:
只需启动一个新shell:
bash >/dev/null 2>&1
Now you can type commands blind :) If you want to leave that mode type: exit
现在你可以输入命令blind :)如果你想离开那个模式类型:退出
But typing commands blind will normally not what you want. So I would suggest to create a text file like script.sh, place your commands in it:
但盲目输入命令通常不是你想要的。所以我建议创建一个像script.sh这样的文本文件,将命令放在其中:
command1 foo
command2 bar
and than execute it using:
而不是使用以下方式执行:
bash script.sh >/dev/null 2>&1
The ouput of all commands in that script will be redirected to /dev/null now
该脚本中所有命令的输出现在将重定向到/ dev / null
#2
3
Use exec without a command:
在没有命令的情况下使用exec:
exec > /dev/null 2>&1
As hex2mgl pointed out, if you do this in an interactive shell, you won't even see your prompt anymore, as the shell prints that to standard error. I assume this is intended for a script, as it doesn't make a lot of sense to ignore all output from commands run interactively :)
正如hex2mgl指出的那样,如果你在交互式shell中执行此操作,则甚至不会再看到提示符,因为shell会将其打印到标准错误。我假设这是用于脚本,因为忽略来自交互式运行的命令的所有输出没有多大意义:)
#3
0
for scripting or other practical purpose, grouping the command is a nice solution. check http://www.gnu.org/software/bash/manual/html_node/Compound-Commands.html It says specifically Any redirections (see Redirections) associated with a compound command apply to all commands within that compound command unless explicitly overridden.
对于脚本或其他实际目的,对命令进行分组是一个很好的解决方案。查看http://www.gnu.org/software/bash/manual/html_node/Compound-Commands.html具体说明任何与复合命令相关的重定向(请参阅重定向)都适用于该复合命令中的所有命令,除非明确覆盖。