StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POTerminal emulator implementation - problems with repeated input
primarykey
Id
8850461
data
AcceptedAnswerId
8851708
AnswerCount
1
ClosedDate
CommentCount
11
CommunityOwnedDate
CreationDate
2012-01-13T12:19:08.730
FavoriteCount
0
LastActivityDate
2012-01-13T14:17:23.110
LastEditDate
2012-01-13T13:27:04.363
LastEditorUserId
417204
OwnerUserId
417204
ParentId
0
PostTypeId
1
Score
1
ViewCount
776
LastEditorDisplayName
text
Body
I am trying to implement a terminal emulator in Java. It is supposed to be able to host both cmd.exe on Windows and bash on Unix-like systems (I would like to support at least Linux and Mac OS X). The problem I have is that both <code>cmd.exe</code> and <code>bash</code> repeat on their standard output whatever I send to their standard input. For example, in bash, I type "<code>ls</code>", hit enter, at which point the terminal emulator sends the input line to bash's stdin and flushes the stream. The process then outputs the input line again "<code>ls\n</code>" and then the output of the <code>ls</code> command. This is a problem, because other programs apart from <code>bash</code> and <code>cmd.exe</code> don't do that. If I run, inside either bash, or <code>cmd.exe</code>, the command "<code>python -i</code>", the python interactive shell does not repeat the input in the way <code>bash</code> and <code>cmd.exe</code> does. This means a workaround would have to know what process the actual output came from. I doubt that's what actual terminal emulators do. Running "<code>bash -i</code>" doesn't change this behaviour. As far as I know, <code>cmd.exe</code> doesn't have distinct "interactive" and "noninteractive" modes. <hr> EDIT: I am creating the host process using the <code>ProcessBuilder</code> class. I am reading the stdout and stderr and writing to the stdin of the process using a technique similar to the <a href="http://www.physionet.org/physiotools/puka/sourceCode/puka/StreamGobbler.java" rel="nofollow">stream gobbler</a>. I don't set any environment variables before I start the host process. The exact commands I use to start the processes are <code>bash -i</code> for bash and <code>cmd</code> for cmd.exe. I'll try to post minimal code example as soon as I manage to create one.
Tags
<bash><shell><terminal><cmd><terminal-emulator>
Title
Terminal emulator implementation - problems with repeated input
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USHonza
UserOwnerUserId
1. USHonza
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POTerminal emulator implementation - problems with repeated input
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.