etaf/blog

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blog's Issues

linux cmd backup

To see etaf belongs to which group:

groups etaf 

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Change etaf's default group to new_group:

usermod -g new_group etaf

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find all the core file and remove them

find ~ -regex ".*core\.[0-9]*" | xargs rm

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redirect stderr to file

cmd 2> stderr.txt

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redirect stdout and stderr to file

cmd >file 2>&1
##first redirect stderr to stdout , then redirect stdout to file 
``

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vim replace

:%s/origin_pattern/new_string/cig

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kill multi process with one line

kill $(ps aux | grep '[p]ython csp_build.py' | awk '{print $2}')
Details on its workings are as follows:

first try kill -15 $(....)
if not help try kill -9

• The ps gives you the list of all the processes.
• The grep filters that based on your search string, [p] is a trick to stop you picking up the actual grep process itself.
• The awk just gives you the second field of each line, which is the PID.
• The $(x) construct means to execute x then take its output and put it on the command line. The output of that ps pipeline inside that construct above is the list of process IDs so you end up with a command like kill 1234 1122 7654.

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run command without shell

nohup command &

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format code

indent -linux x.cpp
or:
clang-format -i -style=xxx *.cpp

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arp scan

sudo arp-scan -I eth0 -l

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find excutabe file

find -type f -perm /u=x -exec ls -l {} \;

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find ip of a ASUS server which has open port 80;

sudo arp-scan -l | grep ASUS | awk '{print $1}' | xargs nmap -p 80 | grep -A 1 -B 3 "open"

solution for syntax of c++ 11 failed in vim

comment the flow line in file ~/.vim/bundle/YouCompleteMe/cpp/ycm/.ycm_extra_conf.py :
'-Wc++98-compat',

Compile latest vim in debian/ubuntu

$ sudo apt-get install xclip clang
$ hg clone https://code.google.com/p/vim/
$ cd vim

##Note: python-config-dir should be set according to real situation.


$./configure -with-features=huge --enable-rubyinterp=yes --enable-pythoninterp=yes --enable-perlinterp=yes  --enable-luainterp=yes  --enable-sniff --enable-multibyte --enable-xim --enable-fontset --enable-gtk2-check --enable-gnome-check --enable-gui=auto --enable-cscope --with-python-config-dir=/usr/lib/python2.7/config --with-x --prefix=/usr > configure_output.txt
$ make
$ sudo make install

install protobuf in ubuntu

apt-get install protobuf-compiler protobuf-c-compiler libprotobuf-dev   

CentOS 7 find windows 7 boot

sodo install ntfs-3g
grub2-mkconfig -o /boot/grub2/grub.conf
sudo grub2-set-default "windows 7 (loader) (on /dev/sda1)"

create tcl file in ns2

i need to create tcl file that include 4 wireless node (n0 , n1 , n2 , n3) zigbee. n1 is authenticated to n0 and n2 request to authenticate to n0 throw n1. n3 has other job dont need now

usage of scp

usage of scp

scp is a tool like cp in linux.The different is,scp copy file between PCs.

copy a file1 from A to B:

A~:  scp -p file1 username@B's IP : ~/file1
eg:
scp -p test.txt [email protected]:~/tset.txt

here -p measn to preserve the modify time ,access time,mode from original file.

copy a directory from A to B

A~:  scp -pr dir1 username@B's IP : ~/dir1
eg:
scp -p test_dir [email protected]:~/tset_dir

here -r means copy a directory

other option see :

man scp

scp without password

on the above step,each scp need you offer the password of the target PC.
Now there is a way to avoid the password step: by ssh certification.

A -> B whithou password

in PC A:
ssh-keygen -t rsa
scp ~/.ssh/id_rsa.pub [email protected]:~/.ssh/authorized_keys

the same for B->A

Centos Latex

sudo yum install tetex-latex

centos share gtk between python2.6 and python2.7

*gtk on python 2.6

$ ls /usr/lib64/python2.6/site-packages | grep gtk

copy all this to /usr/local/lib/python2.7/site-packages/

$ ls /usr/local/lib/python2.7/site-packages | grep gtk

gtk need packages cairo , install pycairo or copy it from python2.6

$ /usr/lib64/python2.6/site-packages/cairo /usr/local/lib/python2.7/site-packages -r

now try to import gtk in python2.7.

centos add python2.7 , python 3.3 while python2.66 still existed

waiting

centos deploy spark

# please run as root
#install jdk
yum install java-1.7.0-openjdk-devel.x86_64
#install scala
tar -xf scala-2.11.2.tgz 
cd scala-2.11.2
cp scala-2.11.2 /usr/local/share/scala -r
echo "export SCALA_HOME=/usr/local/share/scala\nexport PATH=\$PATH:\$SCALA_HOME/bin\n" >> /etc/profile
source /etc/profile
scala -version
#install spark
wget "http://d3kbcqa49mib13.cloudfront.net/spark-1.1.0-bin-hadoop2.4.tgz"
echo "export SPARK_HOME=/home/etaf/software/spark\nexport PATH=\$PATH:\$SPARK_HOME/bin" >> /etc/profile
source /etc/profile

git cmd

push local code to new created repo

$ git init
$ vim .gitignore
$ git add -A
$ git commit -m "init"
$ git remote add origin https://etaf@github.... 
$ git push origin master

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remote file from git repo

$ git rm file
$ git rm -r dir

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added but not commit, rm file added:

$ git rm --cached file

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force replace local code with server code:

$ git reset --hard
$ git pull origin master

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cheate a new branch and switch to it:

$ git checkout -b branch-name

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push local branch to remote server:

$ git push origin branch-name

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fetch remote branch from remote server:

$ git fetch origin

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replace local branch with server branch:

$ git reset --hard HEAD~3         # HEAD~3 means rollback 3 commit versions
$ git pull

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if you make a mistake when using: git reset --hard , then the commits before it would lose(see git log), how to recover them ?

$ git reflog
$ git reset --hard  <sha>

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latest vim with youcomplete

sudo apt-get install xclip clang
hg clone https://code.google.com/p/vim/
cd vim

##Note: python-config-dir should be set according to real situation.
./configure -with-features=huge --enable-rubyinterp=yes --enable-pythoninterp=yes --enable-perlinterp=yes  --enable-luainterp=yes  --enable-sniff --enable-multibyte --enable-xim --enable-fontset --enable-gtk2-check --enable-gnome-check --enable-gui=auto --enable-cscope --with-python-config-dir=/usr/lib/python2.7/config --with-x --prefix=/usr > configure_output.txt
make -j 8
sudo make install
##__Do not use vundle to install it__

git clone https://github.com/Valloric/YouCompleteMe.git
git submodule update --init --recursive
./install.sh --clang-completer --system-libclang              ( _on centos_ )
./install.sh --clang-completer                                          ( _on ubuntu_ )
cp third_party/ycmd/cpp ./ -rf

#now test !

install ns2

./install

...

set env:

#ns2 
export PATH="$PATH:home/etaf/software/ns-allinone-2.35/bin:/home/etaf/software/ns-allinone-2.35/tcl8.5.10/unix:/home/etaf/software/ns-allinone-2.35/tk8.5.10/unix"
export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/home/etaf/software/ns-allinone-2.35/otcl-1.14:/home/etaf/software/ns-allinone-2.35/lib"
export TCL_LIBRARY="/home/etaf/software/ns-allinone-2.35/tcl8.5.10/library:/home/etaf/software/ns-allinone-2.35/tk8.5.10/library"

centos install boost

hop5 repo
first add hop5

install
yum install boost boost-devel

multiple python version install package / lib

for example

pip2.7 install matplotlib
pip3.3 install matplotlib

enable/disable core dump

enable

ulimit -c ulimited
ulimit -c 12345 (12345 is the size of core file)

disable

ulimit -c 0

centos install protobuf

get src

$ ./configure --prefix=/usr
$ make
$ make install

sudo vim /etc/profile

add content:
PKG_CONFIG_PATH="/usr/lib/pkgconfig/:$PKG_CONFIG_PATH"
export PKG_CONFIG_PATH

centos certificate not work

error: Peer's certificate issuer has been marked as not trusted by the user. while accessing https://github.com

Solution:

sudo rm -rf /etc/pki  /etc/ssl
sudo yum reinstall -y openssl ca-certificates