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Creating C macro with ## and __LINE__ (token concatenation with positioning macro)
...the token-pasting operator ## are applied to it. So, you have to use some extra layers of indirection, you can use the token-pasting operator with a recursively expanded argument:
#define TOKENPASTE(x, y) x ## y
#define TOKENPASTE2(x, y) TOKENPASTE(x, y)
#define UNIQUE static void TOKENPASTE2(Uniq...
How do I delete an exported environment variable?
... @RodrigoGurgel using echo won't show existing variable set to empty string or nul. to your point, though, a proper way to test for variable would be env | grep -e '^VARNAME='.
– Thomas
Feb 1 '19 at 14:22
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Cycles in family tree software
...ernally should be going to A on presentation of data.
This will make some extra work for the user, but I guess IT would be relatively easy to implement and maintain.
Building from that, you could work on code synching A and B to avoid inconsistencies.
This solution is surely not perfect, but is a...
Best way to store password in database [closed]
...note that a common misconception is to simply add the same unique and long string to all passwords; while this is not horrible, it is best to add unique salts to every password. Read this for more.
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using data-* attribute with thymeleaf
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If you need to include a variable as part of a string you need to do this: th:attr="data-id='some-text'+${element.getId()}+'some-other-text',data-name=${element.getName()}"
– kabadisha
May 31 '16 at 9:46
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Git merge without auto commit
...t the ideal situation: fast-forwards are a Good Thing, and not having this extra "merge commit" Makes Sense. This is good default behavior and shouldn't be disabled. (In proper parlance, a fast-forward is a type of merge, but it isn't a "true merge".)
– michael
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Command to change the default home directory of a user
...ou can also use bind-mount:
mkdir /home/username
mount --bind --verbose /extra-home/username /home/username
This is useful for allowing access "through" the /home directory to subdirs via daemons that are otherwise configured to avoid pathing through symlinks (apache, ftpd, etc.).
You have to r...
What does -D_XOPEN_SOURCE do/mean?
...t;some number>
it tells your compiler to include definitions for some extra functions that are defined in the X/Open and POSIX standards.
This will give you some extra functionality that exists on most recent UNIX/BSD/Linux systems, but probably doesn't exist on other systems such as Windows.
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What is the use of the pipe symbol in YAML?
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Also look at in-yaml-how-do-i-break-a-string-over-multiple-lines
– Oliver
Apr 12 '18 at 13:18
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Difference between clustered and nonclustered index [duplicate]
... every row in your table. This can be anything, really - an INT, a GUID, a string - pick what makes most sense for your scenario.
2) the clustering key (the column or columns that define the "clustered index" on the table) - this is a physical storage-related thing, and here, a small, stable, ever-...