ArgCV – Page 4 – enjoy coding, enjoy life.

Find all the Chinese characters on TextMate

If we wish to find all the Chinese characters in our TextMate, a simple way is use our regex.

SVM^light is an implementation of Support Vector Machines (SVMs) in C. The author Thorsten Joachims designed a special input format to represent training/test data. It is also widely used by a lot of other programs.

Here is a brief introduction of the input format.

(more…)

By Yu, 7 years2 years ago

Code

SSH port forwarding

SSH Port Forwarding is a mechanism in SSH for tunneling application ports from the client machine to the server machine, or vice versa.

Suppose we wish to visit a port on a remote machine that is behind a firewall; we can use SSH port forwarding to bind that port to our local machine.

(more…)

By Yu, 7 years6 months ago

Code

A Cheat Sheet Regarding to System Hardware info

This post lists a few examples to check the status of your system in macOS and Linux

(more…)

By Yu, 7 years2 years ago

Code

Invoke sudo access to one user/group without password

sudo allows a system administrator to delegate authority to give certain users—or groups of users—the ability to run commands as root or another user while providing an audit trail of the commands and their arguments. It plays a vital role in user controlling. (more…)

By Yu, 7 years2 years ago

Code

How to synchronize your customized keymap

In general, we can click File->Export Settings to export your configuration from one application belong to another belong to JetBrain. If we have multiple workspace distributed in our laptop and PC in our lab, we can even use some plugin like Settings Repository to synchronize the configurations automatically. (more…)

By Yu, 7 years2 years ago

Code

Normalize the cache directory for bazel

According to the doc from the official doc

The outputRoot directory is ~/.cache/bazel. (Unless $TEST_TMPDIR is set, as in a test of bazel itself, in which case this directory is used instead.)

However, if you are in a macOS, it is not true. (more…)

By Yu, 7 years2 years ago

Code

A Few Approaches to Pass Uncertain Number of Variables in C++

Sometimes, we are supposed to accept uncertain number of arguments in C++.

In this post, I am going to introduce 3 ways to implement it, so that you can pick up one of them which is most fit for you in current situation.

(more…)

By Yu, 7 years2 years ago

Code

SIGR: Yet Another Simple SIGnal manageR

Signal plays an important role in communication with POSIX system.

For example, what if our code been killed, interrupted, hung on? Generally, the operation system (I am talking about BSD, Unix-like, POSIX system, same in the follow but will omitted), will not really "KILL" it, it will just send a kill signal with id to this process, the this process will process this signal later.

Here is a table to describe the id to default action.

(more…)

By Yu, 7 years2 years ago

Code

shared_ptr, unique_ptr and weak_ptr

shared_ptr, unique_ptr and weak_ptr are three useful smart pointers that holds a reference which will help us managing our pointers easier.

(more…)

By Yu, 7 years2 years ago

Code

Multilib version problems found in CentOS

Recently, when I ran "yum update" for some update, which will get an error as follow:

--> Processing Dependency: libstdc++.so.6 for package: pcre-8.32-17.el7.i686
---> Package zlib.i686 0:1.2.7-17.el7 will be installed
--> Running transaction check
---> Package libcap-ng.i686 0:0.7.5-4.el7 will be installed
---> Package libstdc++.i686 0:4.8.5-16.el7 will be installed
--> Finished Dependency Resolution
Error: Multilib version problems found. This often means that the root
cause is something else and multilib version checking is just
pointing out that there is a problem. Eg.:

1. You have an upgrade for libstdc++ which is missing some
dependency that another package requires. Yum is trying to
solve this by installing an older version of libstdc++ of the
different architecture. If you exclude the bad architecture
yum will tell you what the root cause is (which package
requires what). You can try redoing the upgrade with
--exclude libstdc++.otherarch ... this should give you an error
message showing the root cause of the problem.

2. You have multiple architectures of libstdc++ installed, but
yum can only see an upgrade for one of those architectures.
If you don't want/need both architectures anymore then you
can remove the one with the missing update and everything
will work.

3. You have duplicate versions of libstdc++ installed already.
You can use "yum check" to get yum show these errors.

...you can also use --setopt=protected_multilib=false to remove
this checking, however this is almost never the correct thing to
do as something else is very likely to go wrong (often causing
much more problems).

Protected multilib versions: libstdc++-4.8.5-16.el7.i686 != libstdc++-4.8.5-11.el7.x86_64
Error: Protected multilib versions: libgcc-4.8.5-16.el7.i686 != libgcc-4.8.5-11.el7.x86_64
Error: Protected multilib versions: pcre-8.32-17.el7.i686 != pcre-8.32-15.el7_2.1.x86_64
Error: Protected multilib versions: elfutils-libelf-0.168-8.el7.i686 != elfutils-libelf-0.166-2.el7.x86_64
Error: Protected multilib versions: libcap-2.22-9.el7.i686 != libcap-2.22-8.el7.x86_64
Error: Protected multilib versions: libdb-5.3.21-20.el7.i686 != libdb-5.3.21-19.el7.x86_64
Error: Protected multilib versions: libgcrypt-1.5.3-14.el7.i686 != libgcrypt-1.5.3-13.el7_3.1.x86_64
Error: Protected multilib versions: elfutils-libs-0.168-8.el7.i686 != elfutils-libs-0.166-2.el7.x86_64
Error: Protected multilib versions: nss-softokn-freebl-3.28.3-8.el7_4.i686 != nss-softokn-freebl-3.16.2.3-14.4.el7.x86_64
Error: Protected multilib versions: libselinux-2.5-11.el7.i686 != libselinux-2.5-6.el7.x86_64

(more…)

By Yu, 7 years2 years ago