actually, it has no -p option. it has a p type, like
where can you use it in real time? any UNIX system.
What are they used for? Bridging together programs which are difficult to use anonymous pipes with. To get an anonymous pipe you have to be a child process of whatever created it, but named pipes can be opened by any arbitrary process, child or not.
They're also used to make dynamic things which act like files, so when something tries to read what used to be a config file or somesuch they get dynamically-generated output from a program.
Can someone please tell me what the command mknod does and what it's syntax is? I can't find it in my "Unix for dummies" book or "Unix in s nutshell". I found it in an existing script that I want to copy, but I want to understand what I am doing. The script is going to do a full export of an... (3 Replies)
from the man page of su:
EXAMPLES
Example 1: Becoming User bin While Retaining Your Previously
Exported Environment
To become user bin while retaining your previously exported
environment, execute:
example% su bin
Example 2: Becoming User bin and ... (4 Replies)
I'm trying to use the "mknod" call in C to create a clone of /dev/null. I am stumped as to the final parameter I should provide to "mknod()". I am supposed to give it a type dev_t, which specifies a major & minor number. I want to specify major 3, minor 1, but how can I do this?
dev_t seems to... (2 Replies)
Hello,
I'm trying to help a guy out on a VMWARE server, running what looks like a cut down version of redhat? 2.4.9-vmnix2 ...
Bascially the box serves vm clients via allocating a LUN from a SAN.. to cut a long story short, I need to find out which SAN the luns are comming from (could be 1... (0 Replies)
Hi,
I'm a oracle DBA with little knowledge of Unix.
I wanted to write some shell scripts which will be helpful for DBA's regular activity.
As i'm a new to oracle with unix can any plese tell me what are all the activities can be done throgh Unix Shell Scripts also suggest me how to learn... (1 Reply)
this is existing issue for this nfs client, which mounts windows exported
file system, and this is only one UNIX box has this problem, other boxes are
fine.
Here is from messages file.
Jan 24 03:11:10 venus nfs: NFS mknod failed for
server arc: error 2 (RPC: Can't decode result)
Jan... (0 Replies)
Hiya all ... i am a newbie to UNIX,
Just want to knwo what this command does:
/sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'
I think, 'grep shows the line with 'inet addr' (which is the 2nd line, displaying the IP Address, Broadcast Address and Subnet Mask) ... Is... (8 Replies)
I have this working ksh, and it returns like below:
LOGICAL VOLUME: prod_2048_005 VOLUME GROUP: prod1vg
TYPE: raw WRITE VERIFY: off
PHYSICAL VOLUME: hdisk108 VOLUME GROUP: prod1vg
TOTAL PPs: 1023 (130944 megabytes) VG DESCRIPTORS: 1
USED PPs: 904 (115712 megabytes) MAX REQUEST: 1 megabyte... (1 Reply)
Hi Guys,
On my AIX server , I have this file "mknod" present in the /etc/ directory. When i try opening it , I dont find
any ascii characters. It shows some encryption/binary format which is not readable. Is it any executable ? what is the
purpose of having this file in etc folder? what if... (2 Replies)
Discussion started by: DBTuner
2 Replies
LEARN ABOUT HPUX
mknod
mknod(1M)mknod(1M)NAME
mknod - create special files
SYNOPSIS
name major minor
name major minor
name
DESCRIPTION
The command creates the following types of files:
o Character device special file (first form),
o Block device special file (second form),
o FIFO file, sometimes called a named pipe (third form).
name is the path name of the file to be created. The newly created file has a default mode that is readable and writable by all users(0666), but the mode is modified by the current setting of the user's file mode creation mask (see umask(1)).
Character and Block Special Files
Character device special files are used for devices that can transfer single bytes at a time, such as nine-track magnetic tape drives,
printers, plotters, disk drives operating in "raw" mode, and terminals. To create a character special file, use the argument.
Block device special files are used for devices that usually transfer a block of data at a time, such as disk drives. To create a block
device special file, use the argument.
The remaining arguments specify the device that will be accessible through the new special file:
major The major number specifies the major device type (for example, the device driver number).
minor The minor number specifies the device location, which is typically, but not always, the unit, drive, and/or line number.
The major and minor values can each be specified in hexadecimal, octal, or decimal, using C language conventions (decimal: no leading zero;
octal: leading zero; hexadecimal: leading
The assignment of major and minor device numbers is specific to each HP-UX system. Refer to the System Administrator manuals supplied with
your system for details.
Only users who have appropriate privileges can use to create a character or block device special file.
FIFO files
To create a FIFO (named pipe or buffer) file, use the argument. You can also use the command for this purpose (see mkfifo(1)). All users
can use to create FIFO files.
WARNINGS
Access Control Lists
In HFS file systems, optional ACL entries can be added to special files and FIFOs with the command (see chacl(1)). In JFS file systems,
optional ACL entries can be added to special files and FIFOs with the command (see setacl(1)). However, system programs are likely to
silently change or eliminate the optional ACL entries for these files.
SEE ALSO chacl(1), mkdir(1), mkfifo(1), setacl(1), umask(1), lsdev(1M), sam(1M), mknod(2), acl(5), aclv(5), mknod(5).
HP-UX System Administrator manuals
STANDARDS CONFORMANCE
mknod: SVID2, SVID3, XPG2
mknod(1M)