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brew update: The following untracked working tree files would be overwritten by merge:
...
Don't forget to fetch the origin!!!
$ cd /usr/local
$ git fetch origin
$ git reset --hard origin/master
Explanation, for those interested:
What happens is that you are trying to update brew, but brew itself is either not up to date (likely), there is a permissi...
App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...骤
6.1 准备工作
1. 在手机上安装向心力实验App
2. 准备一个旋转装置（如沙拉甩干机、小型旋转台、手摇转盘）
3. 准备手机固定支架
4. 准备不同质量的物体（如砝码，用于验证 F 与 m 的关系）
6.2 探究 F 与 ω 的关系
1. 输...
How do you tell if a string contains another string in POSIX sh?
...e
return 1 # $substring is not in $string
fi
}
contains "abcd" "e" || echo "abcd does not contain e"
contains "abcd" "ab" && echo "abcd contains ab"
contains "abcd" "bc" && echo "abcd contains bc"
contains "abcd" "cd" && echo "abcd contains cd"
contains "abcd"...
All combinations of a list of lists
...he product the "manual" way:
def product(*args, **kwds):
# product('ABCD', 'xy') --> Ax Ay Bx By Cx Cy Dx Dy
# product(range(2), repeat=3) --> 000 001 010 011 100 101 110 111
pools = map(tuple, args) * kwds.get('repeat', 1)
result = [[]]
for pool in pools:
result =...
Perform an action in every sub-directory using Bash
...
Use find command.
In GNU find, you can use -execdir parameter:
find . -type d -execdir realpath "{}" ';'
or by using -exec parameter:
find . -type d -exec sh -c 'cd -P "$0" && pwd -P' {} \;
or with xargs command:
find . -type d -print0 | xargs -0 -L1 sh -c ...
Is it possible to do a sparse checkout without checking out the whole repository first?
...re is how I did it:
git clone <URL> --no-checkout <directory>
cd <directory>
git sparse-checkout init --cone # to fetch only root files
git sparse-checkout set apps/my_app libs/my_lib # etc, to list sub-folders to checkout
# they are checked out immediately after this command, no ...
Running V8 Javascript Engine Standalone
...this:
$> svn co http://v8.googlecode.com/svn/trunk v8-trunk
...
$> cd v8-trunk
$> scons
$> g++ ./samples/shell.cc -o v8-shell -I include libv8.a
Now, we have a standalone binary called v8-shell.
Running the console:
$> ./v8-shell
V8 version 2.0.2
> var x = 10;
> x
10
&g...
Is it possible to have a Subversion repository as a Git submodule?
...t repository.
git svn clone -s http://subversion.example.com/ mysvnclone
cd mysvnclone
git remote add origin git@example.com:project.git
git push origin master
Then you can add the git repository as a submodule to the original project
cd /path/to/gitproject
git submodule add git://example.com/p...
How to retrieve absolute path given relative
...
#! /bin/sh
echo "$(cd "$(dirname "$1")"; pwd)/$(basename "$1")"
UPD Some explanations
This script get relative path as argument "$1"
Then we get dirname part of that path (you can pass either dir or file to this script): dirname "$1"
Then w...
Executing multiple commands from a Windows cmd script
...all mvn clean install.
Code that will work
rem run a maven clean install
cd C:\rbe-ui-test-suite
call mvn clean install
rem now run through all the test scripts
call mvn clean install -Prun-integration-tests -Dpattern=tc-login
call mvn clean install -Prun-integration-tests -Dpattern=login-1
Not...