truncate

问题 I have a file, foo.txt , containing the following lines: a b c I want a simple command that results in the contents of foo.txt being: a b 回答1: Using GNU sed: sed -i '$ d' foo.txt The -i option does not exist in GNU sed versions older than 3.95, so you have to use it as a filter with a temporary file: cp foo.txt foo.txt.tmp sed '$ d' foo.txt.tmp > foo.txt rm -f foo.txt.tmp Of course, in that case you could also use head -n -1 instead of sed . MacOS: On Mac OS X (as of 10.7.4), the equivalent

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: How to split a string in PHP at nth occurrence of needle? Let's say I have a string variable: $string = "1 2 3 1 2 3 1 2 3 1 2 3"; I want to cut off the end of this string starting at the fourth occurrence of the substring "2", so $string is now equal to this: "1 2 3 1 2 3 1 2 3 1" Effectively cutting of the fourth occurrence of "2" and everything after it. How would one go about doing this? I know how to count

问题 I am developing a project in VB.Net and I am using Gujarati fonts (non-Unicode). I have placed a DaraGridView (DGV) and displaying the data stored in database in DGV. In DGV, if the contents of the cell is truncated, the DGV shows ellipses (three dots) (...); but as the font is set to a Gujarati font, it displays a Gujarati alphabet "ઈઈઈ" instead of "..." because the Gujarati character "ઈ" is coded with the English "." (dot) character. In Gujarati font, "." can be generated with the English

问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . How do I truncate a string thats 120 characters to 100 characters but have the count of the length start from the end of the string? So that the 20

问题 I've been wondering - I have a lot of use with sysdate on my system, and when comparing it to my date columns I have to use trunc(sysdate) since the format of sysdate is DD/MM/YYYY HH24:MI:SS . I looked over the internet for other functions to return current date on format of DD/MM/YYYY but had no luck, current_date , current_timestamp and ETC also gives me the hours format.. I need this for better performance when comparing an indexed date column to the current date. So , anybody know of a

问题 For various purposes I find myself needing to truncate an IP address, I need to alter an IP address within my program from (xx.x.x.x) to (xx.x.x.1) by changing the last number after the final "." in the string to the value of 1. I theorise that this could be achieved by either truncating the string from the very end up to the final ".", and adding a "1" onto the end of it, or somehow by ordering the program to alter the string value after the final "." to be equal to 1 - none of which i know

问题 I'm working with an array A in MATLAB. The values in this array have up to 5 decimals. I would like to truncate those values to a less number of decimal. Is there a way to accomplish this? Thanks! 回答1: For some reason, Matlab's "truncate" function is called fix . So >> fix(3.5) ans = 3 >> fix(-3.5) ans = -3 To truncate, round, floor, or ceil anything to a given number of decimals, multiply by powers of tens, truncate, round, floor, or ceil, and then divide the result by powers of tens. So: >>

问题 I want to see a specification about "Truncate table with foreign key constraints" like below. Does anyone know where it is defined ? On the minus side, if you have a foreign key constraint referring to the table you are trying to truncate, this won't work - even if the referring table has no data in it! This is because the foreign key checking is done with DDL rather than DML. This can be got around by temporarily disabling the foreign key constraint(s) to the table. http://www.orafaq.com/faq

问题 I'm aware of various ways to truncate an HTML string to a certain length including/not including the HTML tags as part of the result and/or truncating while preserving whole words and whatnot. My issue, though, is if the string includes special characters such as – or & I need to truncate a string to 100 characters (or a few less if it would otherwise truncate in the middle of a special character). Right now I have a function: $result= truncateIfNecessary(strip_tags($fullText), 100); //ignore

问题 I'm new to mysql and need some basic things. I need to round the decimals like : 21,4758 should be 21,48 0,2250 should be 0,22 23,0850 should be 23,08 22,9950 should be 22,99 I tried lots of thing but couldn't make it. Thanks. 回答1: DECLARE @old decimal(38, 10) DECLARE @p decimal(38, 10) SET @p = 21.4758 SET @p = @p * 100 SET @p = @p - 0.01 SET @p = ROUND(@p, 0) SET @p = @p / 100.0 SELECT @p 回答2: Try this: // round the value to two decimal places SELECT ROUND(<YOUR_FIELD>, 2) field FROM <YOUR