NULL(4) Kernel Interfaces Manual NULL(4)NAME
null - data sink
SYNOPSIS
major device number(s):
raw: 1
minor device encoding:
mem: 0; kmem: 1; null: 2
DESCRIPTION
Data written on a null special file is discarded.
Reads from a null special file always return 0 bytes.
FILES
/dev/null
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
SEE ALSO mem(4)3rd Berkeley Distribution January 28, 1988 NULL(4)
Check Out this Related Man Page
LP(4) Kernel Interfaces Manual LP(4)NAME
lp - line printer
SYNOPSIS
/sys/conf/SYSTEM:
NLP lp_printers # Line Printer
LP_MAXCOL 132 # Maximum number of columns on line printers
/etc/dtab:
#Name Unit# Addr Vector Br Handler(s) # Comments
lp ? 177514 200 4 lpintr # lp-11 line printer
major device number(s):
raw: 5
minor device encoding:
bit 01 specifies 64-character set (instead of 96-character set)
bits 06 are reserved
bits 0370 specify line printer unit: <lp_unit> * 8
DESCRIPTION
Lp provides the interface to any of the standard DEC line printers on an LP-11 parallel interface. When it is opened or closed, a suitable
number of page ejects is generated. Bytes written are printed.
The unit number of the printer is specified by the minor device after removing the low 3 bits, which act as per-device parameters. Cur-
rently only the lowest of the low three bits is interpreted: if it is set, the device is treated as having a 64-character set, rather than
a full 96-character set. In the resulting half-ASCII mode, lower case letters are turned into upper case and certain characters are
escaped according to the following table:
{ (
} )
` '
| !
~ ^
The driver correctly interprets carriage returns, backspaces, tabs, and form feeds. Lines longer than the maximum page width are trun-
cated. The page width is specified via the LP_MAXCOL definition, set to 132 in the GENERIC distribution.
FILES
/dev/lp
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
SEE ALSO lpr(1), dtab(5), autoconfig(8)DIAGNOSTICS
None.
BUGS
Although the driver supports multiple printers this has never been tried.
3rd Berkeley Distribution January 28, 1988 LP(4)
Hi,
I would like to know which files contain a certain string. If I use 'grep "string" *' only the working directory is being searched. I also want to search the subdirectories. When I use 'find . -type f -print |xargs grep "string" > dev/null' I get the message 'xargs: missing quote?'. What's... (11 Replies)
im having trouble with moving files in a directory into /dev/null
for file in $HOME/.trashcan/
do
mv $file /dev/null
done
the error msg i get is:
mv: /dev/null: not a directory.
does anyone know how to fix this?
thanks
primal (16 Replies)
Hi, Anyone can help
My solaris 8 system has the following
/dev/null , /dev/tty and /dev/console
All permission are lrwxrwxrwx
Can this be change to a non-world write ??
any impact ?? (12 Replies)
hi all,
iam new to this forum.i have to submit the script EOD.so please help me.
my requirement is to compare two null values..iam trying to compare two null values :One null value output of the storedprocedure and another iam giving spaces in script.
it is giving the error... (11 Replies)
We have a code to find the DNS entry of a host that has a trailing '-' in its url (format example: mysite-.watch.com):
if(gethostbyname_r(host,host_ent,host_buffer,host_buffer_size,&host_error)==NULL)
{
//failed
}
But when remove the '-' from the host name the code does not return... (12 Replies)
Hi All,
I have a file with 10 columns and get the required data for nine columns properly except 8th. In 8th column i have both NULL and NON NULL values...i.e
certain records have values for all the columns including 8th column and certain records have 8th column as NULL.My requisite is,without... (20 Replies)
hi,
i have to put in my script a command that should tell me if the contents of two different paths are the same.
I thought to write an "if" command who makes the diff of two files which contains the `ls` of the folders and go on with the script if is not null, but i'm afraid of the fact... (13 Replies)
Hi,
after a server (solaris 10) got rebooted, Im faced with the problem that in one of my zones (whole zone) /dev/null is only writeable for root
crw-r--r-- 1 root sys 13, 2 Jul 8 10:16 /dev/null
Unfortunatly chmod didnt help at this point and since its a productive system I dont... (11 Replies)
Hi all,
I want to compute for the average of a file with null values (NaN) for each row. any help on how to do it. the sample file looks like this.
1.4 1.2 1.5 NaN 1.6
1.3 1.1 NaN 1.3 NaN
2.4 1.3 1.5 NaN 1.5
NaN 1.2 NaN 1.4 NaN
I need to do a row-wise averaging such that it will sum only... (14 Replies)
Hi,
I have a log file which is having some xml tags. I need to check the value for a particular xml field is null or not and if it is null i have to add current time as the value for that xml field.
I tried below code to check whether the word count is 0. But even if the xml field is null it... (16 Replies)
Hi,
I've a pipe delimited file and wanted to replace the 3rd field to 099990 where the values are null. How can I achieve it using awk or sed.
20130516|00000061|02210|111554|03710|2|205069|SM APPL $80-100 RTL|S
20130516|00000061|02210|111554|03710|2|205069|SM APPL $80-100 RTL|S... (12 Replies)
I am working on a file with several columns as below
MO_NAME,FAULT_TYPE,CLASS,CODE1,CODE2,CODE3
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2A,53,58
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2B,24
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2A,33
RXOCF-101,BTS INTERNAL,FAULT CODES CLASS 2D,57 ... (12 Replies)
Hi All
My requirement is to find the null values in particular column of a file and reject it in case if it contains null values. But the challenge is that I want a common command which can be used across different file, as the position of the column we need to check for different file may get... (14 Replies)