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Defining a variable with or without export
...e in the environment of the current shell (ie the shell calls putenv(3) or setenv(3)).
The environment of a process is inherited across exec, making the variable visible in subshells.
Edit (with 5 year's perspective): this is a silly answer. The purpose of 'export' is to make variables "be in the ...
How to initialize an array in one step using Ruby?
I initialize an array this way:
9 Answers
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How do I test if a variable is a number in Bash?
I just can't figure out how do I make sure an argument passed to my script is a number or not.
38 Answers
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How to check for changes on remote (origin) Git repository?
... the tracking information between local branch and origin:
# git branch --set-upstream-to=origin/<branch> <branch>
For master branch:
git branch --set-upstream-to=origin/master master
share
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Check whether a path is valid
I am just wondering: I am looking for a way to validate if a given path is valid.
(Note: I do not want to check if a file is existing! I only want to proof the validity of the path - So if a file could possibly exists at the location) .
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How to delete and replace last line in the terminal using bash?
I want to implement a progress bar showing elapsed seconds in bash. For this, I need to erase the last line shown on the screen (command "clear" erases all the screen, but I need to erase only the line of the progress bar and replace it with the new information).
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Update multiple rows in same query using PostgreSQL
...date more than one column, it's much more generalizable:
update test as t set
column_a = c.column_a
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
where c.column_b = t.column_b;
You can add as many columns as you like:
update test as t set
column_a = c.column_a...
How to customize ?
Is it possible to change the appearance of <input type="file"> ?
18 Answers
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How to convert string representation of list to a list?
I was wondering what the simplest way is to convert a string list like the following to a list :
15 Answers
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CoInitialize浅析一 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...INIT_APARTMENTTHREADED。我们再来看看CoInitializeEx的实现
769AEF5B mov edi, edi
769AEF5D push ebp
769AEF5E mov ebp, esp
769AEF60 push ecx
769AEF61 push ebx
769AEF62 mov ...