ZERO(4) BSD Kernel Interfaces Manual ZERO(4)NAME
zero -- the zero device
The zero device accepts and reads data as any ordinary (and willing) file, but throws away any data written to it, and returns an endless
supply of null bytes when read.
SEE ALSO full(4), null(4)HISTORY
A zero device appeared in 4.4BSD.
BSD April 7, 1996 BSD
Check Out this Related Man Page
PTY(4) BSD Kernel Interfaces Manual PTY(4)NAME
pty -- BSD-style compatibility pseudo-terminal driver
The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals. When the device
/dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver. A device node for this terminal shall be created, which
has the name /dev/ttyXX.
New code should not try to allocate pseudo-terminals using this interface. It is only provided for compatibility with older C libraries that
tried to open such devices when posix_openpt(2) was being called.
The BSD-style compatibility pseudo-terminal driver uses the following device names:
/dev/pty[l-sL-S][0-9a-v] Pseudo-terminal master devices.
/dev/tty[l-sL-S][0-9a-v] Pseudo-terminal slave devices.
SEE ALSO posix_openpt(2), pts(4), tty(4)HISTORY
A pseudo-terminal driver appeared in 4.2BSD.
Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused. A call to stat(2) on a nonexistent
master device will already cause a new master device node to be created. The master device can only be destroyed by opening and closing it.
The pty driver cannot be unloaded, because it cannot determine if it is being used.
BSD August 20, 2008 BSD
I need to do an add function but it should include the prefixed zeros
j=`expr $i + 1`
The output it shows is 124 but I want the output to be 00124
Could any one help me finding out how to do this
Thanks (16 Replies)
How do I trim the leading zeroes, and (+,-) in the currency field ?
I have a text file.
Your bill of +00002780.96 for a/c no. 25287324 is due on 11-06.
Your bill of +00422270.48 for a/c no. 28931373 is due on 11-06.
I want the O/P file to be like.
Your bill of 2780.96 for a/c no. 25287324... (22 Replies)
I want to delete trailing zeros from varible.
if variable value is 1234.567000 result as 1234.567
if variable has 1234.0000 result as 1234
if variable as abcd.fgh result as abcd.fgh
Can somone give me a solution using awk? (16 Replies)
I would like to trim the following input.
My condition is as long as there's a zero on the left of the number, remove the zeros. Can anybody help me by using sed or awk ?
0011 => change to => 11
0333 => change to => 333
4444 => No change => 4444 (13 Replies)
I have file with numeric values. I need to pad each value with leading zeros such that total lenght of each value is 16.
Any... (12 Replies)
hello everyone. I'm hoping someone can help me out here. I have 2 files. It looks like this:
abc1, defg, 50.00, mno,990
abc2, cats, 100.00, pops,991
abc3, dogs, 1.00, treat,992
990, airplanes, runway, doctor
991, jets, birds, much
990,... (13 Replies)
I tried searching the forum but couldn't find a solution for my question.
I have the following data and would like to have a sed syntax to remove the leading zeroes from the 2nd field only:
2010-01-01|123|1|1000|2000|500|1500|600|700... (18 Replies)
I'm trying to write a bash script to perform basic arithmetic operations but I want to run a comparison on the arguments first to check that they're a number greater than zero.
I want an error to pop up if the arguments args aren't >= 0 so I have:
if ! ]; then
echo "bad number: $1"
... (14 Replies)
I have a list of numbers extracted and need to delete the leading zeros from them, but when i do so, the command I am using also deletes numbers that end in Zero as well. eg 10, 20, 30, etc
this is part of a larger script and the only way I can think of is to try and detect the 10,20 30 etc in... (19 Replies)
I have two files of same structure except some rows are missing randomly in each file. How do I fill the missing rows to have the exact ID column (S01 ~ S96) and rest columns filled with "0" with awk? The purpose of this step is to join the two files side by side. The closest thread is... (17 Replies)
In the below awk, I am trying to calculate percent for a given id. It is very close the problem is when the # being used in the calculation is zero. I am not sure how to code this condition into the awk as it happens frequently. The portion in italics was an attempt but that lead to an error. Thank... (13 Replies)
I have a pipe separated file with two major lines. One is header and another is detail line. Header starts with H and Detail start with D.
D|123456|Joes... (13 Replies)
I have to data sets:
One is in .txt format and other is in .csv format, please refer below two outputs from two files.
SOURCE PAYDATE TOTAL_DOLLARS RECORD_COUNT
ASSET 05/25/2018 247643.94
ASSET 06/20/2018 ... (27 Replies)