Sponsored Content
Full Discussion: Access a File as a Device?
Top Forums UNIX for Advanced & Expert Users Access a File as a Device? Post 302622121 by Scrutinizer on Wednesday 11th of April 2012 03:56:57 PM
Old 04-11-2012
FWIW, $(( X + 5 )) is 100% POSIX. Especially if shell code is to be used in a mixed environment I would suggest to limit oneself to what is specified by POSIX. The fact that /bin/sh may point to different shells, does not matter, for /bin/sh points to a POSIX compliant shell, so your code will most probably run there.

If you require more advanced features then another option would be to use ksh93 which is also available on many systems and still is the most advanced shell IMHO (and also very fast). You could also use bash if that that is available...
 

10 More Discussions You Might Find Interesting

1. Linux

Non exclusive sound device access!!

Hi, I was wondering if any of you guys know of way to make applications that use sound device on linux to access it in a "non-exclusive manner", the aim is to be able to use more than one application that requires the sound device. Thanks (0 Replies)
Discussion started by: andryk
0 Replies

2. Linux

attempt to access beyond end of device

Hi, we have running 8 box sles 9 cluster and on an nfs filesystem we have the problem which is grepped from /var/log/messages. Jun 8 13:40:46 qnclpx02 kernel: attempt to access beyond end of device Jun 8 13:40:46 qnclpx02 kernel: sdat: rw=0, want=8894615912, limit=314572800 Is there... (1 Reply)
Discussion started by: ortsvorsteher
1 Replies

3. UNIX for Dummies Questions & Answers

controll access to a device

Hello everyone, I write a program (Linux & Solaris) that will run as non-root user, but the program must have rw access to a device /dev/ipmi (on linux) or /dev/bmc (on solaris). What is the standard way of granting such access? Linux: chmod on /dev/ipmi ? suid root my program? Solaris:... (1 Reply)
Discussion started by: Pavel.Bures
1 Replies

4. Homework & Coursework Questions

The pseudo-device provides a “backdoor” for gaining root access for a particular user.

Problem statement. In this part of the assignment, delegates will create a pseudo-device and write a device driver for it. The pseudo-device provides a “backdoor” for gaining root access for a particular user. Instead of compiling the device driver into the kernel, delegate will create a module.... (1 Reply)
Discussion started by: nyjilgeorge1
1 Replies

5. OS X (Apple)

Not mounted, no-driver USB device in terminal (how to access?)

hi, i am on a quest to access and even mount if possible a drive on os x. there is no driver for the device, but it lists fine in the system profiler. can i access its location from the terminal? how? here is what i get on the system profiler: Speed: Up to 480 Mb/sec Manufacturer: SAMSUNG ... (3 Replies)
Discussion started by: sontarieh
3 Replies

6. UNIX for Advanced & Expert Users

How the user process can access the character device loaded by my module

I am trying to load into the kernel a system-call dynamically (without restarting the kernel and compailing it) in an attempt to (once in kernel mode) write to user process's memory. (I know there is a way to do this with the ptrace interface but it is not an option.) I know the only way to... (1 Reply)
Discussion started by: hopelessProgram
1 Replies

7. Cybersecurity

Can't access my device DJI Phantom 3 which uses UNIX. Need Help please!

Equipment: DJI Phantom 3 I have the root and passwords access, but I cannot find out how to access the equipment. There is a USB port going to a miniUSB that connects to the equipment, but on Windows is detecting the connection as being a Serial Port (COM3). I need some help in order to gain... (5 Replies)
Discussion started by: nobr3ga
5 Replies

8. Ubuntu

Cannot access or boot encrypted drive (gave up waiting for root device...)

I cannot access or boot from my C drive. I'm running Zorin 9 and the drive is a Samsung SSD. The disk was encrypted on install, and that has not given me any problems before. When I start the system it gets to the memory test page, and does not then load the password prompt, which it used to.... (1 Reply)
Discussion started by: David4321
1 Replies

9. UNIX for Dummies Questions & Answers

Exclusive access for few IPs to NTP device

How to provide a client exclusive access to the NTP device or NTP server. Example: 1. Configured md5 authentication for a subnet added below restriction line to the subnet as below in ntp.conf file. Also configured the keys and md5 authentication working . restrict 192.168.1.0 mask... (1 Reply)
Discussion started by: iqtan
1 Replies

10. HP-UX

Failed to open tape device /dev/rmt/0mn:Device busy (errno = 16)

Hi, Unable to make tape backup, please help. /opt/ignite/bin/make_tape_recovery -a /dev/rmt/?mn -I -v -m tar -x inc_entire=vg00 * Creating local directories for configuration files and archive. ======= 04/25/16 16:28:08 IST Started /opt/ignite/bin/make_tape_recovery. (Mon... (4 Replies)
Discussion started by: anuragr
4 Replies
proto(4)						     Kernel Interfaces Manual							  proto(4)

NAME
proto - prototype job file for at SYNOPSIS
DESCRIPTION
When a job is submitted to or the job is constructed as a POSIX shell script (see at(1)). The job file is created in as follows: o creates a header describing the job as an job or a job. jobs submitted to all queues other than queue are listed as jobs. The header is: for an job, or for a job. o A set of POSIX shell commands is added to make the environment (see environ(5)) for the job the same as the current environment. o then copies text from the prototype file to the job file, except for special variables that are replaced by other text: Replaced by the current working directory. Replaced by the current file size limit (see ulimit(2)). Replaced by the current umask (see umask(2)). Replaced by the time at which the job should be run, expressed as seconds since January 1, 1970, 00:00 Coordinated Universal Time, preceded by a colon. Replaced by text read by from the standard input (that is, the commands provided to to be run in the job). o When a job is submitted to queue queue, uses the file as the prototype file if it exists. Otherwise, it uses the file EXAMPLES
The following file creates commands to change the current directory, file size limit, and umask in the job to their respective values as they existed when was originally run. These commands are inserted before the commands in the job: SEE ALSO
at(1), queuedefs(4). STANDARDS CONFORMANCE
proto(4)
All times are GMT -4. The time now is 06:14 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy