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Detach (move) subdirectory into separate Git repository
...e the other files, so they can be pruned. Let's also add --tag-name-filter cat --prune-empty to remove empty commits and to rewrite tags (note that this will have to strip their signature):
git filter-branch --tag-name-filter cat --prune-empty --subdirectory-filter ABC -- --all
or alternatively, ...
MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...查看该文件信息，具体信息如下：
[root@localhost mongodb]# cat students.dat
{ "_id" : { "$oid" : "5031143350f2481577ea81e5" }, "classid" : 1, "age" : 20, "name" : "kobe" }
{ "_id" : { "$oid" : "5031144a50f2481577ea81e6" }, "classid" : 1, "age" : 23, "name" : "nash" }
{ "_id" : { "...
How can I view the source code for a function?
...
The output already offers a lot of information. standardGeneric is an indicator of an S4 function. The method to see defined S4 methods is offered helpfully:
> showMethods(chol2inv)
Function: chol2inv (package base)
x="ANY"
x="CHMfactor"
x="denseMatrix"
x="diagonalMatrix"
x="dtrMatrix"
x="spars...
Passing argument to alias in bash [duplicate]
...his is the solution which can avoid using function:
alias addone='{ num=$(cat -); echo "input: $num"; echo "result:$(($num+1))"; }<<<'
test result
addone 200
input: 200
result:201
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How to turn on (literally) ALL of GCC's warnings?
...a different meaning (or doesn't work) in traditional C, e.g. "string " "concatenation", or ISO C function definitions! Do you really care about compatibility with 30 year old compilers? Do you really want a warning for writing int inc(int i) { return i+1; } ?
I think -Weffc++ is too noisy to be us...
How do I create a crontab through a script
...rontabs (including root), you can do something like:
crontab -l -u user | cat - filename | crontab -u user -
where the file named "filename" contains items to append. You could also do text manipulation using sed or another tool in place of cat. You should use the crontab command instead of direc...
Are static fields inherited?
....e.:
class A
{
public:
static int MaxHP;
};
int A::MaxHP = 23;
class Cat: A
{
public:
static const int MaxHP = 100;
};
works fine and with different values for A::MaxHP and Cat::MaxHP -- in this case the subclass is "not inheriting" the static from the base class, since, so to speak, it'...
How to get the current branch name in Git?
...3
submodule: remotes/origin/HEAD
general detached head: v1.0.6-5-g2393761
cat .git/HEAD:
local branch: ref: refs/heads/master
submodule: cat: .git/HEAD: Not a directory
all other use cases: SHA of the corresponding commit
git rev-parse --abbrev-ref HEAD
local branch: master
all the other use c...
How can I remove the first line of a text file using bash/sed script?
...edirection (>) happens before tail is invoked by the shell:
Shell truncates file $FILE
Shell creates a new process for tail
Shell redirects stdout of the tail process to $FILE
tail reads from the now empty $FILE
If you want to remove the first line inside the file, you should use:
tail -n +2...
In Git, how do I figure out what my current revision is?
...ion hash:
$ git rev-parse --short HEAD
It is often sufficient to do:
$ cat .git/refs/heads/${branch-master}
but this is not reliable as the ref may be packed.
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