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How do I “un-revert” a reverted Git commit?
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Please note this will remove all changes in working tree and index. Use git stash to save any changes you don't wan't to lose.
– zpon
Aug 30 '16 at 5:37
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Create an empty data.frame
... File=character(),
User=character(),
stringsAsFactors=FALSE)
Here's an other example with different column types :
df <- data.frame(Doubles=double(),
Ints=integer(),
Factors=factor(),
Logicals=logical()...
Storing Images in PostgreSQL
...we see that image sizes, and number of images, are growing and growing, in all applications...
We need some distinction between "original image" and "processed image", like thumbnail.
As Jcoby's answer says, there are two options, then, I recommend:
use blob (Binary Large OBject): for original imag...
Unix command to find lines common in two files
...thing in 1.txt will be interpreted as a regular expression and not a plain string. Also, any blank line in 1.txt will match all lines in 2.txt. So grep will only work in very specific situations. You'd at least want to use fgrep (or grep -f) but the blank-line thing is probably going to wreak havoc ...
IF… OR IF… in a windows batch file
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The zmbq solution is good, but cannot be used in all situations, such as inside a block of code like a FOR DO(...) loop.
An alternative is to use an indicator variable. Initialize it to be undefined, and then define it only if any one of the OR conditions is true. Then use ...
How to copy a directory using Ant
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@s1n This commands only copies all the contents of src_dir to ../new/dir and not the src_dir. How do we copy src_dir (directory) to another location?
– Pipalayan Nayak
Dec 3 '11 at 19:24
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How do I change the cursor between Normal and Insert modes in Vim?
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if has("autocmd")
au InsertEnter * silent execute "!gconftool-2 --type string --set /apps/gnome-terminal/profiles/Default/cursor_shape ibeam"
au InsertLeave * silent execute "!gconftool-2 --type string --set /apps/gnome-terminal/profiles/Default/cursor_shape block"
au VimLeave * silent execu...
Determine file creation date in Java
...util.concurrent.TimeUnit;
public class Main
{
public static void main(String[] args) {
File file = new File("c:\\1.txt");
Path filePath = file.toPath();
BasicFileAttributes attributes = null;
try
{
attributes =
Files.read...
Getting an “ambiguous redirect” error
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Bash can be pretty obtuse sometimes.
The following commands all return different error messages for basically the same error:
$ echo hello >
bash: syntax error near unexpected token `newline`
$ echo hello > ${NONEXISTENT}
bash: ${NONEXISTENT}: ambiguous redirect
$ echo hello ...
Why are mutable structs “evil”?
...end to have multiple properties; yet if you have a struct with two ints, a string, a DateTime and a bool, you can very quickly burn through a lot of memory. With a class, multiple callers can share a reference to the same instance (references are small).
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