Linux

tools

command line

disk
- ncdu

gui

xclip over ssh

remote

yum install xclip xauth

client

ssh -X 192.168.2.21

save to clipboard:

echo "101" | xclip -i

get from clipboard:

any GUI apps, use mouse wheel click.

wget通过https下载文件报错

错误现象

[chenyang@glue ~]$ wget  'https://raw.githubusercontent.com/sp-chenyang/xxutils/master/newticket.py?12440' -O /tmp/xxdebug2.py
--2014-11-28 11:34:55--  https://raw.githubusercontent.com/sp-chenyang/xxutils/master/newticket.py?12440
Resolving raw.githubusercontent.com... 103.245.222.133
Connecting to raw.githubusercontent.com|103.245.222.133|:443... connected.
ERROR: certificate common name “www.github.com” doesn’t match requested host name “raw.githubusercontent.com”.
To connect to raw.githubusercontent.com insecurely, use ‘--no-check-certificate’.

但是通过curl下载就没有问题，google了一下，可能是不同的发行版，不同的wget的有差异，也有可能是ssl的依赖差异，暂时不查了，通过curl来下载吧。

https://github.com/Hexxeh/rpi-update/issues/65

kickstart

%include not work

See this http://docs.oracle.com/cd/E37670_01/E41137/html/ch03s01.html#idm47635948085408

xxx.ks file are not on host local file system. So you should point with a URL.

%include http://192.168.1.3/kickstart/create_user.ks

gnuplot

Plotting GPU(NVidia) temperature with gnuplot

Logging gpu temp with crond/perl

$ cat /etc/cron.d/gpu 
# check gpu temp
* * * * * root /opt/gpu.pl
* * * * * root /opt/gpu.sh

$ cat /opt/gpu.pl

#!/usr/bin/perl
use strict;

[...]

my @nvidia_smi = `/usr/bin/nvidia-smi -q -d TEMPERATURE`;
my $max=0;

foreach my $line (@nvidia_smi)
{
  if( $line =~ /^\s+GPU\ Current\ Temp\s+:\s*(\d+)\s*C$/ )
  {
    if( $max < $1)
    {
       $max = 0 + $1;
    }
  }
}

# time format: May-08-21:08:07
my @months = qw( Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec );
my @time = localtime(time);
my $sec = $time[0];
my $min = $time[1];
my $hour = $time[2];
my $mday = $time[3];
my $mon = $time[4];
my $log_file = "/var/log/gpu.log";
open(my $fd, ">>", $log_file);
print $fd "$months[$mon]-$mday-$hour:$min:$sec $max\n";

exit(0);

gnu plot script file. (orignal file copy from https://securfox.wordpress.com/2009/09/02/plotting-cpu-temperature-with-gnuplot/ )

$ cat /opt/gpu.gp 
set terminal png size 1024,768
set xdata time
# eg. May-08-21:02:03
set timefmt "%b-%d-%H:%M:%S"
set output "/var/log/gpu.png"
# time range must be in same format as data file
set xrange ["May-08-21:35:00":"May-08-21:45:00"]
set yrange [0:100]
set grid
set xlabel "Date-Time"
set ylabel "°C"
set title "CPU temperature"
set key left box
plot "/var/log/gpu.log" using 1:2 index 0 title "aldebaran" with lines

Create a local mirror repo of Centos

rsync -avzH --delete --exclude "i386" --exclude "*DVD*" --exclude "*CD*"  --exclude "*.iso"  rsync://mirrors.yun-idc.com/centos/7.1.1503/ /home/www/html/centos/7.1.1503

Jenkins

Jenkins Multi configuration job: Skip build step if slave is offline

Using Elastic axis plugin, and set Skip building on offline nodes

awk

redhat 6.4

vim /etc/sysconfig/iptables

then restore from config file

/sbin/iptables-restore /etc/sysconfig/iptables

ncdu - disk usage analyzer with an ncurses interface

sudo apt-get install ncdu
sudo yum install ncdu

Defining a variable with or without export

 ~  foo="foo"
 ~  export bar="bar"
 ~  echo $foo
foo
 ~  echo $bar
bar
 ~  bash
chenyang@chenyang-pc:~ $ echo $foo

chenyang@chenyang-pc:~ $ echo $bar
bar

unzip解压缩乱码

unzip -O cp936 中文.zip

md5sum

 ~  echo -n "STRING" | md5sum
63b588d5559f64f89a416e656880b949  -
 ~  echo -n "STRING" | md5sum | cut -f1 -d' '
63b588d5559f64f89a416e656880b949

https://www.linuxquestions.org/questions/linux-general-1/create-md5-hash-from-string-128322/#post4274458

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