Invoking shell from java, it complaints "stty: standard input: Invalid argument"

Question

I invoke a shell command by Process class from java and it prints

"stty: standard input: Invalid argument"

no matter whether the command is right or wrong (normal output of shell command is shown too). If I run the shell command in shell, no such error message is shown.

The command is something like this: {"/bin/csh", "-c", "echo hello"}

I did nothing but very simple things to invoke "echo hello" from java. This code acutually runs ok several weeks ago, so I think something wrong with my bash recently, not java — solotim, Mar 29 '10 at 08:38
i believe there are ways in Java to perform operating system functions and there is no need to call system commands. what command are you calling that Java doesn't have a module for that? — ghostdog74, Mar 29 '10 at 09:11
Well, I want to create a shell embeded in java. User can input any shell command and java will execute them and return stdout/stderr to java gui. — solotim, Mar 30 '10 at 02:48

score 8 · Answer 1 · answered Mar 29 '10 at 08:18

8

You are invoking the stty command from your .profile, or .bash_profile. You'll have to redirect its standard error to /dev/null.

stty blah blah blah 2>/dev/null

stty can't deal with the pseudo-tty that Java provides in shelling out.

answered Mar 29 '10 at 08:18

Jonathan Feinberg

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Thanks, but what blah stands for? – solotim Mar 29 '10 at 08:34
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It doesn't matter what it stands for. Invoking stty in a context where there isn't a tty, such as an exec'd process, is wrong. You can't do it. – user207421 Mar 29 '10 at 09:15

score 4 · Accepted Answer · answered Mar 29 '10 at 09:09

4

Try using the -f option of csh to disable the reading of the .chsrc and .login files:

    {"/bin/csh", "-cf", "echo hello"}

answered Mar 29 '10 at 09:09

user85421

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@solotim: why not? anyway, if it works, it's an indication that the .cshrc or the .login script is trying to adjust the terminal without checking if there is one. The next step should be to add this check to the scripts... – user85421 Mar 30 '10 at 08:57

score 1 · Answer 3 · answered Mar 29 '10 at 08:24

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Quoth the documentation for java.lang.Process:

"The methods that create processes may not work well for special processes on certain native platforms, such as native windowing processes, daemon processes, Win16/DOS processes on Microsoft Windows, or shell scripts. The created subprocess does not have its own terminal or console."

Perhaps you would like the java.lang.ProcessBuilder, instead.

answered Mar 29 '10 at 08:24

msw

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Thanks. But actually I used ProcessBuilder too, it turns out the same results. – solotim Mar 29 '10 at 08:27

score 0 · Answer 4 · edited May 23 '17 at 12:02

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Have you look here. I managed to run some commands like this

edited May 23 '17 at 12:02

Community

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answered Mar 29 '10 at 08:48

Shervin Asgari

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Invoking shell from java, it complaints "stty: standard input: Invalid argument"

4 Answers4

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