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Difference between “!==” and “==!” [closed]
...else. I was baffled that a simple comparison ( if ($var ==! " ") ) didn't work as expected. After some testing I realized that whoever wrote that code used ==! instead of !== as comparison operator. I've never seen ==! in any language so I wondered how the hell this code could even work and di...
Ternary operator (?:) in Bash
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ternary operator ? : is just short form of if/else
case "$b" in
5) a=$c ;;
*) a=$d ;;
esac
Or
[[ $b = 5 ]] && a="$c" || a="$d"
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Can I use Class.newInstance() with constructor arguments?
...tance() but the class I am instantiating does not have a nullary constructor. Therefore I need to be able to pass in constructor arguments. Is there a way to do this?
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character showing up in files. How to remove them?
I am doing compressing of JavaScript files and the compressor is complaining that my files have  character in them.
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Changing column names of a data frame
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Use the colnames() function:
R> X <- data.frame(bad=1:3, worse=rnorm(3))
R> X
bad worse
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
R> colnames(X) <- c("good", "better")
R> X
good better
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
You can also sub...
How to import an existing X.509 certificate and private key in Java keystore to use in SSL?
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Believe or not, keytool does not provide such basic functionality like importing private key to keystore. You can try this workaround with merging PKSC12 file with private key to a keystore:
keytool -importkeystore \
-deststorepass...
How do you rename a Git tag?
Today I was looking through the logs for a project and realized that I fat fingered a tag name some time ago. Is there some way to rename the tag? Google hasn't turned up anything useful.
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JPA OneToMany not deleting child
...th a simple @OneToMany mapping between a parent and a child entity. All works well, only that child records are not deleted when I remove them from the collection.
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Twitter bootstrap 3 two columns full height
...with twitter bootstrap 3. It seems that twitter bootstrap 3 does not support full height layouts.
What I want to do:
19 A...
Getting the folder name from a path
What objects or methods could I use that would give me a result of folder2 ?
9 Answers
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