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Get environment variable value in Dockerfile
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So you can do:
cat Dockerfile | envsubst | docker build -t my-target -
Then have a Dockerfile with something like:
ENV MY_ENV_VAR $MY_ENV_VAR
I guess there might be a problem with some special characters, but this works for most cases a...
Is there a way to instantiate objects from a string holding their class name?
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Why does C++ not have reflection?
How can I add reflection to a C++ application?
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How to extract numbers from a string in Python?
...ct only positive integers, try the following:
>>> str = "h3110 23 cat 444.4 rabbit 11 2 dog"
>>> [int(s) for s in str.split() if s.isdigit()]
[23, 11, 2]
I would argue that this is better than the regex example because you don't need another module and it's more readable because y...
Where is the itoa function in Linux?
...ld know this if you turned on compiler warnings :)
– cat
Sep 22 '16 at 17:25
3
@cat But there are...
How to get key names from JSON using jq
curl http://testhost.test.com:8080/application/app/version | jq '.version' | jq '.[]'
7 Answers
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How to trick an application into thinking its stdout is a terminal, not a pipe
...mmand in quotes. The script runs and sends output to the tty which is duplicated in the supplied file, but I can't seem to get the linux version to behave the same way... I'm probably doing something wrong. So what's the equivalent linux script command for this on macOS: script -q -t 0 tmp.out perl ...
What is the use of static constructors?
...y the runtime the first time it is needed (the exact rules there are complicated (see "beforefieldinit"), and changed subtly between CLR2 and CLR4). Unless you abuse reflection, it is guaranteed to run at most once (even if two threads arrive at the same time).
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Getting root permissions on a file inside of vi? [closed]
...utions, you will see the commercial-at symbol omitted. Depending on the location, % is a valid expression, and has the same effect as reading the % register. Nested inside another expression the shortcut is generally disallowed, however: such as in this case.
>NUL and >/dev/null redirect st...
C/C++ with GCC: Statically add resource files to executable/library
...of the executable file:
g++ foo.c -o foo0
zip -r resources.zip resources/
cat foo0 resources.zip >foo
This works, because a) Most executable image formats don't care if there's extra data behind the image and b) zip stores the file signature at the end of the zip file. This means, your executa...
Get list of all tables in Oracle?
... that the DBA grants you the SELECT ANY DICTIONARY privilege or the SELECT_CATALOG_ROLE role (either of which would allow you to query any data dictionary table). Of course, you may want to exclude certain schemas like SYS and SYSTEM which have large numbers of Oracle tables that you probably don't...