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java, compare two Strings

In java, if we want to compare two string, such as A= 'abc' and B = 'abc', we should use:
if(A.equals(B)){} . It return true or false.
Not if(A == B) It return the whether the memory address is the same.

first - Lin 的博客 | Lin Blog

http://linrio.github.io/2019/06/06/first/

Every failure is leading towards success.

Java正则表达式2

Java正则表达式的应用

sudo rm /lib64/libc.so.6

I make a mistaken that delete the libc.so.6 by sudo rm /lib64/libc.so.6.
I try to run

sudo LD_PRELOAD=/lib64/libc-2.12.so ln -s /lib64/libc-2.12.so libc.so.6
sudo: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory

And, it can not rebuild the soft link also:

[llf@k20-1 lib]$ sudo ln -sf /lib64/libc-2.14.so /lib64/libc.so.6
sudo: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory

How to address this mistake?

CPU占用高的解决方法 - Lin 的博客 | Lin Blog

http://linrio.github.io/2019/06/10/high-occupied-CPU/

Every failure is leading towards success.

Compile bazel error: Executing genrule //src/main/protobuf:command_server_cc_proto_codegen failed: process-wrapper failed...

I want to install bazel by compiling source from bazel. $cd bazel, then I run $./compile.sh. It occurs error:

*OS:
Linux k20-1 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22 00:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

*GCC version:

[llf@k20-1 lib64]$ gcc -v
使用内建 specs。
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc4.8.2/libexec/gcc/x86_64-unknown-linux-gnu/4.8.2/lto-wrapper
目标：x86_64-unknown-linux-gnu
配置为：../configure --prefix=/usr/local/gcc4.8.2/ --enable-threads=posix --disable-checking --enable-languages=c,c++ --disable-multilib
线程模型：posix
gcc 版本 4.8.2 (GCC) 

The compile error:

[llf@k20-1 bazel]$ ./compile.sh 
INFO: You can skip this first step by providing a path to the bazel binary as second argument:
INFO:    ./compile.sh compile /path/to/bazel
馃崈  Building Bazel from scratch.......
馃崈  Building Bazel with Bazel.
.WARNING: /tmp/bazel_EuUM0clx/out/external/bazel_tools/WORKSPACE:1: Workspace name in /tmp/bazel_EuUM0clx/out/external/bazel_tools/WORKSPACE (@io_bazel) does not match the name given in the repository's definition (@bazel_tools); this will cause a build error in future versions.
INFO: Found 1 target...
INFO: From Compiling src/main/cpp/blaze_util.cc:
src/main/cpp/blaze_util.cc: In function 'uint64_t blaze::AcquireLock(const string&, bool, bool, blaze::BlazeLock*)':
src/main/cpp/blaze_util.cc:421:30: warning: ignoring return value of 'int ftruncate(int, __off_t)', declared with attribute warn_unused_result [-Wunused-result]
   (void) ftruncate(lockfd, 0);
                              ^
src/main/cpp/blaze_util.cc:426:47: warning: ignoring return value of 'ssize_t write(int, const void*, size_t)', declared with attribute warn_unused_result [-Wunused-result]
   (void) write(lockfd, msg.data(), msg.size());
                                               ^
INFO: From Compiling src/main/cpp/blaze_util_posix.cc:
src/main/cpp/blaze_util_posix.cc: In function 'void blaze::Daemonize(const string&)':
src/main/cpp/blaze_util_posix.cc:104:28: warning: ignoring return value of 'int dup(int)', declared with attribute warn_unused_result [-Wunused-result]
   (void) dup(STDOUT_FILENO);  // stderr (2>&1)
                            ^
INFO: From JavacBootstrap src/java_tools/buildjar/java/com/google/devtools/build/buildjar/libbootstrap_JarOwner.jar [for host]:
warning: Implicitly compiled files were not subject to annotation processing.
  Use -proc:none to disable annotation processing or -implicit to specify a policy for implicit compilation.
1 warning
ERROR: /home/llf/bazel/src/main/protobuf/BUILD:36:1: Executing genrule //src/main/protobuf:command_server_cc_proto_codegen failed: process-wrapper failed: error executing command 
  (cd /tmp/bazel_EuUM0clx/out/bazel-sandbox/a95caa17-3b0c-4368-8de3-92f81b4fe053-666/execroot/bazel && \
  exec env - \
    LD_LIBRARY_PATH=/usr/local/cuda-7.5/lib64::/usr/local/lib \
    PATH=/home/llf/anaconda3/bin:/usr/local/cuda-7.5/bin:/usr/lib64/qt-3.3/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/opt/ibutils/bin:/usr/local/cuda/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/home/llf/usr/local/python/bin:/home/llf/usr/local/gmp-1/bin:/home/llf/usr/local/bazel/bin:/home/llf/usr/local/python/bin:/usr/local/cuda/bin/:/usr/bin/java:/usr/java/jdk1.8.0_111/bin \
  /tmp/bazel_EuUM0clx/out/execroot/bazel/_bin/process-wrapper -1 5 - - /bin/bash -c 'source external/bazel_tools/tools/genrule/genrule-setup.sh; third_party/protobuf/3.0.0/protoc-3.0.0-linux-x86_64.exe\
    --plugin=protoc-gen-grpc=bazel-out/host/bin/third_party/grpc/cpp_plugin\
    --cpp_out=bazel-out/local-opt/genfiles\
    --grpc_out=bazel-out/local-opt/genfiles\
    src/main/protobuf/command_server.proto').
bazel-out/host/bin/third_party/grpc/cpp_plugin: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.18' not found (required by bazel-out/host/bin/third_party/grpc/cpp_plugin)
--grpc_out: protoc-gen-grpc: Plugin failed with status code 1.
Target //src:bazel failed to build
INFO: Elapsed time: 45.674s, Critical Path: 40.50s

ERROR: Could not build Bazel

How to address this problem? Refence the error

The R Project for Statistical Computing

install R： http://mirrors.opencas.cn/cran/

_1， Download R for Windows
2， install R for the first time.
3， R-3.2.4 for Windows (32/64 bit)

_

About - Lin 的博客 | Lin Blog

http://linrio.github.io/about/

Every failure is leading towards success.

Cache Trashing - Lin 的博客 | Lin Blog

http://linrio.github.io/2019/06/06/Cache-Trashing/

Every failure is leading towards success.

Install gcc 4.8.2 by recompiling source on off-line server with CentOS 6.4 Operating System

My server in laboratory is off-line, I can not install any software or depends library by yum install or wget http://.... Fortunately, I have super-user privileges(my username is in the /etc/sudoers), it's help for installing gcc. Let's begin to install gcc-4.8.2.

1. Make sure your system information, my OS(Operating System) is :
   Linux k20-1 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22 00:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

2. On your personal computer you download gcc 4.8.2 installation package _gcc-4.8.2.tar.gz
   _ from GCC. Then transport the package to your server by scp ./gcc-4.8.2.tar.gz /home/user/gcc.

3. Decompress the package by $tar -zxvf gcc-4.8.2.tar.gz ( or by if $tar -jxvf gcc-4.8.2.tar.bz2 ). Then go to gcc-4.8.2 directory by $cd /home/user/gcc/gcc-4.8.2 to see what depends library we should download by $vi gcc-4.8.1/contrib/download_prerequisites . It shows that gcc-4.8.2 needs gmp-5.1.3, mpfr-3.1.2 and mpc-1.0.1.

4. From ftp://ftp.gnu.org/gnu/gmp/ download GMP install package gmp-5.1.3 .tar.bz2.
   From mpfr to download MPFR install package mpfr-3.1.2.tar.gz.
   From multiprecision to download MPC install package mpc-1.0.1.tar.gz

5. Decompress the GMP, MPFR and MPC packages by $tar -zxvf or $tar -jxvf. Then,
   Install GMP:

[llf@k20-1 ~]$ cd gmp-5.1.3
[llf@k20-1 ~]$ sudo ./configure
[llf@k20-1 ~]$ sudo make
[llf@k20-1 ~]$ sudo make check
[llf@k20-1 ~]$ sudo make install

Install MPFR:

[llf@k20-1 ~]$ cd mpfr-3.1.2
[llf@k20-1 ~]$ sudo ./configure  --with-gmp-include=/usr/local/include --with-gmp-lib=/usr/local/lib
[llf@k20-1 ~]$ sudo make
[llf@k20-1 ~]$ sudo make check
[llf@k20-1 ~]$ sudo make install

Install MPC:

[llf@k20-1 ~]$ cd mpc-1.0.1
[llf@k20-1 ~]$ sudo ./configure  --with-gmp-include=/usr/local/include --with-gmp-lib=/usr/local/lib  --with-mpfr-include=/usr/local/include --with-mpfr-lib=/usr/local/lib
[llf@k20-1 ~]$ sudo make
[llf@k20-1 ~]$ sudo make check
[llf@k20-1 ~]$ sudo make install

6. Add the include and lib to ~/.bashrc,

$vi ~/.bashrc  then add
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
export C_INCLUDE_PATH=/usr/local/include:$C_INCLUDE_PATH
to  at the end of file.

7. Add the lib to share libraries. $sudo vi /etc/ld.so.conf adding the following to it:

/usr/local/lib

8. Install gcc-4.8.2. Make gcc install directory $sudo mkdir /usr/local/gcc4.8.2. Then cd /home/user/gcc/gcc-4.8.2. Run,

[llf@k20-1 ~]$ mkdir build  
[llf@k20-1 ~]$ cd build  
[llf@k20-1 ~]$ sudo ../configure --prefix=/usr/local/gcc4.8.2 --enable-threads=posix --disable-checking --enable-languages=c,c++ --disable-multilib  --with-gmp-include=/usr/local/include --with-gmp-lib=/usr/local/lib  --with-mpfr-include=/usr/local/include --with-mpfr-lib=/usr/local/lib --with-mpc-include=/usr/local/include --with-mpc-lib=/usr/local/lib
[llf@k20-1 ~]$ sudo make
[llf@k20-1 ~]$ sudo make install

9. The end result of sudo make is:

libtool: link: ranlib .libs/libatomic.a
libtool: link: ( cd ".libs" && rm -f "libatomic.la" && ln -s "../libatomic.la" "libatomic.la" )
true  DO=all multi-do # make
make[4]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build/x86_64-unknown-linux-gnu/libatomic'
make[3]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build/x86_64-unknown-linux-gnu/libatomic'
make[2]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build/x86_64-unknown-linux-gnu/libatomic'
make[1]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build'

10. The end result of sudo make install is:

libtool: finish: PATH="/sbin:/bin:/usr/sbin:/usr/bin:/sbin" ldconfig -n /usr/local/gcc4.8.2/lib/../lib64
ldconfig: /usr/local/gcc4.8.2/lib/../lib64/libstdc++.so.6.0.18-gdb.py is not an ELF file - it has the wrong magic bytes at the start.

----------------------------------------------------------------------
Libraries have been installed in:
   /usr/local/gcc4.8.2/lib/../lib64

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
make[4]: Nothing to be done for `install-data-am'.
make[4]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build/x86_64-unknown-linux-gnu/libatomic'
make[3]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build/x86_64-unknown-linux-gnu/libatomic'
make[2]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build/x86_64-unknown-linux-gnu/libatomic'
make[1]: Leaving directory `/home/llf/support/gcc/gcc-4.8.2/build'

11. Create soft link.

[llf@k20-1 ~]$ sudo mkdir /usr/gcc4.4.7backup/ 
[llf@k20-1 ~]$ sudo mv /usr/bin/{gcc,g++} /usr/gcc4.4.7backup
[llf@k20-1 ~]$ ln -s /usr/local/gcc4.8.2/bin/gcc  /usr/bin/gcc
[llf@k20-1 ~]$ ln -s /usr/local/gcc4.8.2/bin/g++ /usr/bin/g++
[llf@k20-1 ~]$ gcc -v
It will show your new version of GCC.

It's batter to create a README.md in /usr/gcc4.4.7backup in case other users need to use old gcc version gcc-4.4.7:

[llf@k20-1 ~]$ vi /usr/gcc4.4.7backup/README.md
writing: if you want to use gcc-4.4.7. Please 
[llf@k20-1 ~]$ sudo mv /usr/gcc4.4.7backup/{gcc,g++} /usr/bin

Reference from 1, 2, 2, 4

java 正则表达式

1. 正则表达式30分钟入门教程