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javac not working in windows command prompt
... denotes the JDK installed directory, e.g., C:\Program Files\Java\jdk1.8.0_xx). You need to include the "\bin" directory in the PATH.
To edit the PATH environment variable in Windows XP/Vista/7/8:
Control Panel ⇒ System ⇒ Advanced system settings
Switch to "Advanced" tab ⇒ Environment Varia...
How to replace a whole line with sed?
...
Try this:
sed "s/aaa=.*/aaa=xxx/g"
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How to replace a string in multiple files in linux command line
...t, which is appended to the old file names. So sed -i .bak 's/foo/bar/g' *.xx moves all .xx files to the equivalent .xx.bak name and then generates the .xx files with the foo→bar substitution.
– Anaphory
Oct 4 '14 at 22:35
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NullPointerException in Java with no StackTrace
...f optimization. To get the stack traces back, you need to pass the option -XX:-OmitStackTraceInFastThrow to the JVM.
The optimization is that when an exception (typically a NullPointerException) occurs for the first time, the full stack trace is printed and the JVM remembers the stack trace (or may...
How to specify new GCC path for CMake
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Do not overwrite CMAKE_C_COMPILER, but export CC (and CXX) before calling cmake:
export CC=/usr/local/bin/gcc
export CXX=/usr/local/bin/g++
cmake /path/to/your/project
make
The export only needs to be done once, the first time you configure the project, then those values will ...
Wrapping a C library in Python: C, Cython or ctypes?
...ped out, just trying to show you the gist of it):
from ctypes import *
d2xx = WinDLL('ftd2xx')
OK = 0
INVALID_HANDLE = 1
DEVICE_NOT_FOUND = 2
DEVICE_NOT_OPENED = 3
...
def openEx(serial):
serial = create_string_buffer(serial)
handle = c_int()
if d2xx.FT_OpenEx(serial, OPEN_BY_SERIAL...
Updating MySQL primary key
...e a single "alter table" statement to update the primary key.
alter table xx drop primary key, add primary key(k1, k2, k3);
To fix things:
create table fixit (user_2, user_1, type, timestamp, n, primary key( user_2, user_1, type) );
lock table fixit write, user_interactions u write, user_interac...
How to tell if a string is not defined in a Bash shell script
...guish whether VAR is set but empty or not set, you can use:
if [ -z "${VAR+xxx}" ]; then echo VAR is not set at all; fi
if [ -z "$VAR" ] && [ "${VAR+xxx}" = "xxx" ]; then echo VAR is set but empty; fi
You probably can combine the two tests on the second line into one with:
if [ -z "$VAR" -a...
程序员才能听得懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...家里也有台电脑？CPU是什么型号的？”
13、北京程序员xx遭遇车祸成植物人，医生说活下来希望只有万分之一，唤醒更为渺茫。他的Leader和亲人没放弃，他们根据xx视工作如命的作风，每天都在他身边念：“xx！IE6侧边栏又乱了...
/usr/lib64/gcc/ ... /bin/ld: cannot find -lxxx 踩坑记录 - C/C++ - 清泛网 - 专注C/C++及内核技术
/usr/lib64/gcc/ ... /bin/ld: cannot find -lxxx 踩坑记录编译一个模块时依赖xxx模块，在确认依赖路径及依赖xxx so文件名均正确的前提下，编译仍然报错： usr lib64 gcc bin ld: cannot find -lxxx最后才发现，xxx目录生成的目 编译一个模块时依...