大约有 35,100 项符合查询结果（耗时：0.0479秒） [XML]
How to list containers in Docker
There's a command to list images, docker images , but there doesn't seem to be a corresponding docker containers .
14 Ans...
How can I replace a newline (\n) using sed?
...ch is the whole file).
Here is cross-platform compatible syntax which works with BSD and OS X's sed (as per @Benjie comment):
sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/ /g' file
As you can see, using sed for this otherwise simple problem is problematic. For a simpler and adequate solution see this ...
Do I need to heartbeat to keep a TCP connection open?
...listener and Component B is the client. The two should communicate as quickly as possible. There can only ever be one connection at any time (though that is aside to this question). A senior developer at my company has said I need to use application level heartbeats between the two components to ...
Get current date/time in seconds
...
sje397sje397
38.1k77 gold badges7878 silver badges9999 bronze badges
...
Mercurial: how to amend the last commit?
I'm looking for a counter-part of git commit --amend in Mercurial, i.e. a way to modify the commit which my working copy is linked to. I'm only interested in the last commit, not an arbitrary earlier commit.
...
How do I pronounce “=>” as used in lambda expressions in .Net
...ge > 16 reads as "P, such that p.Age is greater than 16."
In fact, I asked this very question on the official linq pre-release forums, and Anders Hejlsberg responded by saying
I usually read the => operator as "becomes" or "for which". For example,
Func f = x => x * 2;
Func test = ...
Is it possible to preview stash contents in git?
I often put work away for later, then other stuff comes along, and a few weeks later, I want to inspect the stash, and find out what changes it would make if I applied it to working tree in its current state.
...
ExecJS and could not find a JavaScript runtime
... the Mongoid / Devise Rails 3.1 template ( Mongoid and Devise ), and I keep getting an error stating ExecJS cannot find a JavaScript runtime. Fair enough when I didn't have any installed, but I've tried installing Node.js , Mustang and the Ruby Racer , but nothing is working.
...
Find and replace in file and overwrite file doesn't work, it empties the file
I would like to run a find and replace on an HTML file through the command line.
13 Answers
...
Extracting specific columns from a data frame
...
Using the dplyr package, if your data.frame is called df1:
library(dplyr)
df1 %>%
select(A, B, E)
This can also be written without the %>% pipe as:
select(df1, A, B, E)
...