I have been busy reading away on devices and filesystems and I am stuck on a particular subject matter.. I'm not understanding the concept behind mknod mkfifo makedev or related commands..
can anyone shed some light on the subject.!
any feedback welcome!
moxxx68 (0 Replies)
I'm having problem writing a shell script using bash that takes a file as an argument. The script should be able to determine what permissions the owner, group and everybody has for the file passed in.
could anyone plz help me out. (3 Replies)
#!/bin/bash
echo $1 | cat - $2 >> /tmp/$$ && mv /tmp/$$ $2
im trying to get the first argument to go in the middle of the second argument which is a file, anyone any ideas. i have only managed to get it to go on the end or the front.
been fiddling about with wc -l, i get the number of lines... (5 Replies)
Suppose that I have some data:
12,30
12,45
2,3
7,8
3,9
30, 8
45,54
56,65
Where (a,b) indicates that a is connected to b. I want to get all connected nodes to one point. For instance, the output of the above
example should be something like:
Group 1
2,3
3,9
Group 2
12,30
12,45... (4 Replies)
Hi all,
I have been struggling with this all day, and it is key to a conversion database I have to write.
The data converts the information out of an array using AWK, and basically all I have to do is figure out how to get the value of a variable inside a variable.
Right now at its... (11 Replies)
I want to search for the line with the group name and add the user into the group. The file format is the same as /etc/group
The code i wrote is
egrep "^$newGID" $group >/dev/null
FS=":"
oldData=awk -F: '{print $3}'
newData= "$oldData,$newUser"
sed -n $4/$newData $group
but a friend... (1 Reply)
Hi All
I have script that find 777 dir with specific extension like .php .Now after finding all 777 directory i will place in httpd.conf using a directory directive ,Now i was not do that,if directory entry exitst in httpd.conf then script ignor it dont show me at stdout else if it dont find... (2 Replies)
I am beginner in awk
awk 'BEGIN{for(i=1;(getline<"opnoise")>0;i++) arr=$1}{print arr}'
In the above script, opnoise is a file, I am reading it into an array and then printing the value corresponding to index 20. Well this is not my real objective, but I have posted this example to describe... (1 Reply)
I am developing a multi-threaded library that helps the transformation of messages between threads in different processes using shared memory.
I am using the pthreads condition facility in order to synchronize access to the shared memory slots through which the messages are passed.
My test... (2 Replies)
I was given this to do,
Write a Shell script to automatically check that a specified user is logged in to the computer.
The program should allow the person running the script to specify the name of the user to be checked, the frequency in seconds at which the script should check. If a... (1 Reply)
Discussion started by: operator
1 Replies
LEARN ABOUT PHP
round
ROUND(3) 1 ROUND(3)round - Rounds a floatSYNOPSIS
float round (float $val, [int $precision], [int $mode = PHP_ROUND_HALF_UP])
DESCRIPTION
Returns the rounded value of $val to specified $precision (number of digits after the decimal point). $precision can also be negative or
zero (default).
Note
PHP doesn't handle strings like "12,300.2" correctly by default. See converting from strings.
PARAMETERS
o $val
- The value to round
o $precision
- The optional number of decimal digits to round to.
o $mode
- Use one of the following constants to specify the mode in which rounding occurs.
+--------------------+---------------------------------------------------+
| Constant | |
| | |
| | Description |
| | |
+--------------------+---------------------------------------------------+
| | |
| PHP_ROUND_HALF_UP | |
| | |
| | Round $val up to $precision decimal places away |
| | from zero, when it is half way there. Making 1.5 |
| | into 2 and -1.5 into -2. |
| | |
| | |
|PHP_ROUND_HALF_DOWN | |
| | |
| | Round $val down to $precision decimal places |
| | towards zero, when it is half way there. Making |
| | 1.5 into 1 and -1.5 into -1. |
| | |
| | |
|PHP_ROUND_HALF_EVEN | |
| | |
| | Round $val to $precision decimal places towards |
| | the next even value. |
| | |
| | |
|PHP_ROUND_HALF_ODD | |
| | |
| | Round $val to $precision decimal places towards |
| | the next odd value. |
| | |
+--------------------+---------------------------------------------------+
RETURN VALUES
The rounded value
EXAMPLES
Example #1
round(3) examples
<?php
echo round(3.4); // 3
echo round(3.5); // 4
echo round(3.6); // 4
echo round(3.6, 0); // 4
echo round(1.95583, 2); // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
?>
Example #2
$mode examples
<?php
echo round(9.5, 0, PHP_ROUND_HALF_UP); // 10
echo round(9.5, 0, PHP_ROUND_HALF_DOWN); // 9
echo round(9.5, 0, PHP_ROUND_HALF_EVEN); // 10
echo round(9.5, 0, PHP_ROUND_HALF_ODD); // 9
echo round(8.5, 0, PHP_ROUND_HALF_UP); // 9
echo round(8.5, 0, PHP_ROUND_HALF_DOWN); // 8
echo round(8.5, 0, PHP_ROUND_HALF_EVEN); // 8
echo round(8.5, 0, PHP_ROUND_HALF_ODD); // 9
?>
Example #3
$mode with precision examples
<?php
/* Using PHP_ROUND_HALF_UP with 1 decimal digit precision */
echo round( 1.55, 1, PHP_ROUND_HALF_UP); // 1.6
echo round( 1.54, 1, PHP_ROUND_HALF_UP); // 1.5
echo round(-1.55, 1, PHP_ROUND_HALF_UP); // -1.6
echo round(-1.54, 1, PHP_ROUND_HALF_UP); // -1.5
/* Using PHP_ROUND_HALF_DOWN with 1 decimal digit precision */
echo round( 1.55, 1, PHP_ROUND_HALF_DOWN); // 1.5
echo round( 1.54, 1, PHP_ROUND_HALF_DOWN); // 1.5
echo round(-1.55, 1, PHP_ROUND_HALF_DOWN); // -1.5
echo round(-1.54, 1, PHP_ROUND_HALF_DOWN); // -1.5
/* Using PHP_ROUND_HALF_EVEN with 1 decimal digit precision */
echo round( 1.55, 1, PHP_ROUND_HALF_EVEN); // 1.6
echo round( 1.54, 1, PHP_ROUND_HALF_EVEN); // 1.5
echo round(-1.55, 1, PHP_ROUND_HALF_EVEN); // -1.6
echo round(-1.54, 1, PHP_ROUND_HALF_EVEN); // -1.5
/* Using PHP_ROUND_HALF_ODD with 1 decimal digit precision */
echo round( 1.55, 1, PHP_ROUND_HALF_ODD); // 1.5
echo round( 1.54, 1, PHP_ROUND_HALF_ODD); // 1.5
echo round(-1.55, 1, PHP_ROUND_HALF_ODD); // -1.5
echo round(-1.54, 1, PHP_ROUND_HALF_ODD); // -1.5
?>
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.0 | |
| | |
| | The $mode parameter was introduced. |
| | |
| 5.2.7 | |
| | |
| | The inner workings of round(3) was changed to |
| | conform to the C99 standard. |
| | |
+--------+---------------------------------------------------+
SEE ALSO ceil(3), floor(3), number_format(3).
PHP Documentation Group ROUND(3)