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How to use Swift @autoclosure
...ue"
If we omit the braces, we are passing in an expression and that's an error:
f(pred: 2 > 1)
// error: '>' produces 'Bool', not the expected contextual result type '() -> Bool'
@autoclosure creates an automatic closure around the expression. So when the caller writes an expression li...
PostgreSQL database default location on Linux
...untu 14.04 by default.
You can find postgresql.conf and look at param data_directory. If it is commented then database directory is the same as this config file directory.
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How do I include a pipe | in my linux find -exec command?
...the -c option. Otherwise you will get a puzzling No such file or directory error message.
– asmaier
Dec 6 '13 at 12:22
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How to make “if not true condition”?
...
I think it can be simplified into:
grep sysa /etc/passwd || {
echo "ERROR - The user sysa could not be looked up"
exit 2
}
or in a single command line
$ grep sysa /etc/passwd || { echo "ERROR - The user sysa could not be looked up"; exit 2; }
...
Tar archiving that takes input from a list of files
...e this: tar -cvf allfiles.tar --exclude='^#' -T mylist.txt. Tar reports an error, but when you check your tar archive, there are no errors, and all files from the list are inside your archive.
– Matt G
Oct 31 '18 at 6:05
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How to specify the default error page in web.xml?
I am using <error-page> element in web.xml to specify the friendly error page when user encounters a certain error such as error with code of 404:
...
String comparison in bash. [[: not found
...
The error is expected when you run the script via sh myscript.sh, because /bin/sh emulates a Bourne shell where [[ is not a builtin. However, running the script via ./script.sh should not yield an error, because in that case the ...
How to use git with gnome-keyring integration
... Mac (Git 2.11+)
git config --global credential.helper libsecret
(See "Error when using Git credential helper with gnome-keyring")
Windows:
git config --global credential.helper manager
(See "How to sign out in Git Bash console in Windows?": That is Git for Windows using the latest Microso...
What is the difference between “Class.forName()” and “Class.forName().newInstance()”?
...ing.html
– Johanna
Jan 19 '10 at 12:05
2
in the above site is written that:"Calling the Class.for...
Display two files side by side
...f gems
– Hasturkun
Nov 12 '12 at 13:05
1
Is there a way for pr to auto-detect screen width?
...