pipe

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can program know return value of previous command in pipe chain?

If I have progA | progB, then can I make some progB executable (in any language) which will know the return code of p开发者_StackOverflow中文版rogA?[详细]

2023-03-20 05:43 分类：问答
linux cli: conditional command dependent on original program in pipe chain

If I开发者_开发问答 type: progA | progB && progC then progC is conditional on progB, and not on progA. Is there a way to both pipe the output of progA to progB, and then, after progA is don[详细]

2023-03-20 05:43 分类：问答
pipe usage in virtual tty

i am using a simple pipe programing for writing and reading the tty which made from inserting the program code from the linux device driver book version 3 of o\'reilly. i inserted this 开发者_如何学运[详细]

2023-03-19 20:25 分类：问答
increment bash variable when piping to function

I\'m trying to do the following: function func() # in practice: logs the output of a code block to a file[详细]

2023-03-19 17:32 分类：问答
chaining Popen subprocesses properly

i have a construct like the following: os.mkfifo(\'pipe.tmp\') enc = Popen([\'encoder\', \'-i\', \'pipe.tmp\'])[详细]

2023-03-19 02:36 分类：问答
stdin is missing for any process I pipe into which uses Windows ftype and assoc mechanism to select the correct executable

I\'m on WindowsXP. This seems to affect any process, but I\'ll use Python3.2 to demonstrate it. A script, \'filter.py\':[详细]

2023-03-19 00:34 分类：问答
writing linux shell

I am trying to learn Unix C and doing some exercises for practice. I am currently working on writing my own shell that works similar to the linux bash shell.[详细]

2023-03-18 20:28 分类：问答
how do I pipe with use Parallel::ForkManager?

I want to have children processes write to the parent\'s @array. I\'ve read about piping but I\'m very confused on how to actually implement it:[详细]

2023-03-18 09:43 分类：问答
How to read a long from a pipe?

This concerns unnamed pipes in interprocess communication. I have a pipe and one process stores a value in it and the other want to read this valus which is numerical, either int or long.[详细]

2023-03-18 01:25 分类：问答
how to send unix command from client to server then return the result?

im trying to send a unix command from a client to a server, wait for the server to execute it then return the result to the client.[详细]

2023-03-17 17:46 分类：问答