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What is a unix command for deleting the first N characters of a line?
... be the best tool for this as it can both filter and perform the necessary string manipulation functions on filtered lines:
tail -f logfile | awk '/org.springframework/ {print substr($0, 6)}'
or
tail -f logfile | awk '/org.springframework/ && sub(/^.{5}/,"",$0)'
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How can we prepend strings with StringBuilder?
I know we can append strings using StringBuilder . Is there a way we can prepend strings (i.e. add strings in front of a string) using StringBuilder so we can keep the performance benefits that StringBuilder offers?
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What do single quotes do in C++ when used on multiple characters?
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It's a multi-character literal. 1952805748 is 0x74657374, which decomposes as
0x74 -> 't'
0x65 -> 'e'
0x73 -> 's'
0x74 -> 't'
Edit:
C++ standard, §2.14.3/1 - Character literals
(...) An ordinary character literal that conta...
MySQL, Check if a column exists in a table with SQL
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@Mfoo Thanks Mfoo, you saved my day! Works like charm. One of the best solutions apart from creating Procedures for this task.
– webblover
Feb 14 '14 at 17:49
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Convert a byte array to integer in Java and vice versa
...andatory indeed. byte b = 0; b |= 0x88; System.out.println(Integer.toString(b, 16)); //Output: -78 System.out.println(Integer.toString(b & 0xFF, 16)); //Output: 88
– HBN
Dec 6 '14 at 17:54
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Javascript calculate the day of the year (1 - 366)
... that for 0-based month values, one just needs to remove the -- from --m.
Extra:
Note, don't use this day's per month algorithm if you need just max day's per month. In that case there is a more efficient algorithm (because we only need leepYear when the month is February) I posted as answer this q...
How to convert List to List?
... @markthewizard1234 That will happen if your listofIDs is an IQueryable<string> that has not been executed. Execute it first with ToList() before you do the conversion: listofIDs.ToList().Select(int.Parse).ToList()
– Michael Hornfeck
Jun 13 '16 at 19:59
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Java 调用外部进程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...中调用外部应用(.exe)。起初直接使用Runtime.getRuntime().exec(String co...最近需要用Java写一个调用外部应用的程序，也就是说要在Java程序中调用外部应用(.exe)。
起初直接使用“Runtime.getRuntime().exec(String command, String[] env, File dir)”这...
Subscript and Superscript a String in Android
How can you print a string with a subscript or superscript? Can you do this without an external library? I want this to display in a TextView in Android.
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Dynamically Changing log4j log level
...he documentation of org.apache.log4j.xml.DOMConfigurator.configureAndWatch(String,long) for details. The default wait time between checks is 60 seconds. These changes would be persistent, since you directly change the configuration file on the filesystem. All you need to do is to invoke DOMConfigura...