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1. Homework & Coursework Questions
Good evening, I'm trying to do my own shell and I encountered some issues while creating it. Indeed when I try such a command I have
DAUPHINE> DAUPHINE> ls -l | grep terminal > fichier
DAUPHINE> cat fichier
My shell is named DAUPHINE
Whereas I should have:
Code:
... (0 Replies)
Discussion started by: AntoineCompagni
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Hi,
I am learning shell scripting for the first time. I use AT&T Korn Shell, Version AJM 93u+ 2012-08-01, compiled from source on NetBSD.
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3. AIX
Dear all experts,
I have a script written to compress a list of files, during compressing, some of the files are having same name. When the compressing started, the same name file will be prompted with message whether to overwrite the old file. I need to enter "y" to continue.
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Hi,
I want to change the shell prompt, using the cd command.
I have a shell prompt like this -
p78-mfx(dgaw1078/9781)$
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here the shell prompt should change like this -
p78-mfx(dgaw1078/9781)log4j$ (6 Replies)
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5. Shell Programming and Scripting
I'm new to working with pipes, so I don't know whether the following is expected behaviour or a bug on the part of an application.
Since Version 0.47, Inkscape provides a non-GUI interactive shell mode of operation. I am trying to time the program's performance in converting SVG files to PNG... (1 Reply)
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Hi,
I saw something in weird in Shell prompt.
I did the following steps
1) Typed ls -l and pressed ESC without entering
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currently, I set my prompt in my .cshrc file as:
set prompt = "%B%h %m %P %/ \n% "
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Thanks (3 Replies)
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Hi, I´m using SCO Unix 5.0.5 and I want to configure de variable PS1, so when I type the command:
cd /etc/
the prompt shows
/etc/_>
Is that possible with sh shell? I´ll appreciate your help.
Thanks, a Happy New Year! (1 Reply)
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9. UNIX for Dummies Questions & Answers
When I login to a specific machine (running Solaris 2.8; actually serveral machines behave this way), with a known good account, I don't get any shell prompt, and no screen responses to various commands such as ID and PWD. Any ideas on what is causing this, and how to change this behavior? (2 Replies)
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pipe(2) System Calls Manual pipe(2)
Name
pipe - create an interprocess channel
Syntax
include <limits.h> /*Definition of PIPE_MAX*/
pipe(fildes)
int fildes[2];
Arguments
fildes Passing an address as an array of two integers into the system call.
Description
The system call creates an I/O mechanism called a pipe. The file descriptors returned can be used in and operations. Their integer values
will be the two lowest available at the time of the function call. The O_NONBLOCK and FD_CLOEXEC flags will be clear on both file descrip-
tors.
When the pipe is written using the descriptor fildes[1], up to PIPE_MAX bytes of data are buffered before the writing process is suspended.
A read using the descriptor fildes[0] picks up the data.
It is assumed that after the pipe has been set up, two (or more) cooperating processes (created by subsequent calls) pass data through the
pipe with and calls.
The shell has a syntax to set up a linear array of processes connected by pipes.
For further information on how and calls behave with pipes, see the and reference pages.
A signal is generated if a write on a pipe with only one end is attempted.
Restrictions
Should more than 4096 bytes be necessary in any pipe among a loop of processes, deadlock may occur.
The underlying implementation of pipes is no longer socket based, but rather implemented through the file system. Any application that
needs socket functionality from pipes should use the system call.
Return Values
The function value zero is returned if the pipe was created; -1 if an error occurred.
Diagnostics
The call fails if:
[EMFILE] Too many descriptors are active.
[ENFILE] The system file table is full.
[EFAULT] The fildes buffer is in an invalid area of the process's address space.
Environment
Differs from the System V definition in that ENFILE is not a possible error condition.
See Also
sh(1), fork(2), read(2), socketpair(2), write(2)
pipe(2)