unix « Gugulethu Ncube

1. application menu display Application menu (right click) -> Uncheck "Show Button ... Read more

Size Of Directory and Disk Space

du -s .archived/

du -sk

k: result in KB

x: expands but only on the local file system (does not follow NFS Links)

du -xh | egrep "^[0-9\.]+[GT]"

# Using root dir to start

du -xh / |egrep "^[0-9\.]+[GT]"

# Flat @directory level

du -Sh |egrep "^[0-9\.]+[GT]"

du -x --max-depth=1 –h

du -Shx |egrep "^[0-9\.]+[GT]"

# Free Disk Space

df -vh

References tbd ... Read more

Adding additional locales can be necessary to read date information in available ... Read more

Spynner is a stateful programmatic web browser module for Python based on PyQT and ... Read more

find . -name "*.flv.mp4" | while read file;

echo "$file";

mv "$file" "${file%.flv.mp4}.mp4"

#mv "$file" "$(expr "$file" : '$.*$\.flv.mp4').mp4"

done;

Notes: rename rename does not work: "$rename ... Read more

The following aliases have made my unix life 10x easier 🙂

1	cat ~/.bash_aliases

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alias pj='ps -fA|grep java'

# pdf viewer

alias v='qpdfview'

# open browser

alias b='x-www-browser'

# check space left in drives

alias space='df -h'

# open password gorilla

alias pw='password-gorilla'

# Show hidden files

alias l.='ls -d .* --color=auto'

# cd .. aliases

alias ..='cd ..'

alias ...='cd ../..'

alias ....='cd ../../..'

alias .....='cd ../../../..'

alias ......='cd ../../../../..'

alias .......='cd ../../../../../..'

alias ........='cd ../../../../../../..'

alias .........='cd ../../../../../../../..'

alias ..........='cd ../../../../../../../../..'

alias .2='cd ../..'

alias .3='cd ../../..'

alias .4='cd ../../../..'

alias .5='cd ../../../../..'

alias .6='cd ../../../../../..'

alias .7='cd ../../../../../../..'

alias .8='cd ../../../../../../../..'

alias .9='cd ../../../../../../../../..'

alias .10='cd ../../../../../../../../../..'

alias .11='cd ../../../../../../../../../../..'

# history grab

alias hig='history|grep '

alias sz="du -ch $@| egrep '[0-9]+[\.KMGT]\stotal'|awk '{print \$1;}'"

# Grabs the disk usage in the current directory

#alias usage='du -ch | grep total'

#Gets the total disk usage on your machine

alias totalusage='df -hl --total | grep total'

# Shows the individual partition usages without the temporary memory values

alias partusage='df -hlT --exclude-type=tmpfs --exclude-type=devtmpfs'

# Gives you what is using the most space. Both directories and files. Varies on

# current directory

alias most='du -hsx * | sort -rh | head -10'

# shadowbq December 17, 2012 at 2:08 pm

# usage is better written as

alias usage='du -ch 2> /dev/null |tail -1'

alias mkdir='mkdir -pv'

# Create a new set of commands

alias path='echo -e ${PATH//:/\\n}'

# current date now

alias now='date +"%T'

alias nowtime=now

alias nowdate='date +"%d-%m-%Y"'

# Show open ports

#Use netstat command to quickly list all TCP/UDP port on the server:

alias du1='du -h -d 1'

alias ports='netstat -tulanp'

# find files using locate - sudo apt-get install locate

alias lo='locate -i -b --regex'

# ls aliases

alias lf='ls -alF --color=auto'

alias la='ls -al --color=auto'

alias ll='ls -l --color=auto'

alias l='ls -l --color=auto'

alias lh='ls -lh --color=auto'

alias cls='clear'

# ls look into directories above

alias l1='ls -l ..'

alias l2='ls -l ../..'

alias l3='ls -l ../../..'

alias l4='ls -l ../../../..'

alias l='ls -alF --color=auto '

alias ls='ls --color=auto'

alias dir='ls -l --color=auto'

# go to home directory

alias h='cd ~'

alias home='cd ~'

# beep - why or why do you want to make noise ? just fun :)

alias beep='echo -en "\007"'

# delete directories

alias rd='rm -rf'

# create directory

alias md='mkdir -p'

alias o='less'

alias t='tail -f '

# hash

alias rehash='hash -r'

#alias unmount='echo "Error: Try the command: umount" 1>&2; false'

#alias which='type -p'

#alias you='su - -c "/sbin/yast2 online_update"'

# some more ls aliases

# sudo apt-get install -y iotop

alias io='sudo iotop -Pao'

alias upd='sudo apt-get update -y'

alias af='sudo apt-get -f'

alias ar='sudo apt-get -y autoremove'

# apt-get install shortcut

alias i='sudo apt-get install -y'

# apt-get remove shortcut

alias u='sudo apt-get remove -y'

# check if a particular process is running

alias p='ps -ef|egrep -v "grep --color=auto"|egrep --color'

# kill a process

alias k='sudo killall -I -r '

#alias kk='sudo kill -KILL '

#alias pk='sudo pkill -i -f '

#alias rm="mv -t ~/.Trash"

#alias rm="mv -bt ~/.local/share/Trash/files/"

#alias rm='mkdir -p ~/.Trash;mv -t ~/.Trash'

#alias rm='mkdir -p ~/.Trash;mv -n -b -t ~/.Trash'

# use trash command for all deletes - avoids false deletes

# sudo apt-get install -y python-setuptools trash-cli

alias rm='trash-put'

# check blocked network port

alias bp='sudo netstat -lnptu|grep '

References 1. ... Read more

# Install the gnome-fallback-session and Xfce

sudo apt-get install gnome-session-fallback xfce4 -y

# Check if the new sessions have been actually installed

ls -ail /usr/share/xsessions

total 48

drwxr-xr-x 2 root root 4096 2012-04-15 11:55 ./

drwxr-xr-x 307 root root 12288 2012-04-15 11:55 ../

-rw-r--r-- 1 root root 233 2011-12-04 22:15 gnome-classic.desktop

-rw-r--r-- 1 root root 205 2011-12-04 22:15 gnome.desktop

-rw-r--r-- 1 root root 277 2011-12-04 22:15 gnome-fallback.desktop

-rw-r--r-- 1 root root 188 2011-12-04 22:15 gnome-shell.desktop

-rw-r--r-- 1 root root 208 2011-12-04 22:15 ubuntu-2d.desktop

-rw-r--r-- 1 root root 185 2011-12-04 22:15 ubuntu.desktop

-rw-r--r-- 1 root root 5808 2011-09-23 13:21 xfce.desktop

# select Xfce as default GUI

sudo /usr/lib/lightdm/lightdm-set-defaults -s xfce

# logout

/usr/bin/gnome-session-quit --no-prompt

Next Steps - select in the login box "xfce ... Read more

Apple Safari Installation in Ubuntu Firstly install PlayOnLinux, which allow easy ... Read more

Installation Redis is a fast key value store developed by Salvatore Sanfilippo (antirez). Redis ... Read more

Installation pylibmc is a great Python client for memcached written in C.

1	sudo pip install pylibmc

Mini ... Read more

Installation beanstalkc is a c-based python client library for beanstalkd. Installation ... Read more

Installation through Ubuntu Repository

1	sudo apt-get install -y beanstalkd

The ... Read more

Installation using PIP

# install python-pip

sudo apt-get install -y python-pip

# install cql driver

sudo pip install cql

Manual Installation from ... Read more

The example below shows command rediects to a variable, especially when the output ... Read more

wmstat

vmstat 1

htop Installation

1 2	sudo apt-get install -y htop sudo htop

atop Installation

1 2	sudo apt-get install -y atop sudo atop

How ... Read more

Installation

# add cassandra sources to /etc/apt/sources.list.d/cassandra.sources.list

# cassandra version 21x

sudo tee /etc/apt/sources.list.d/cassandra.sources.list <<_EOF_

deb http://www.apache.org/dist/cassandra/debian 21x main

deb-src http://www.apache.org/dist/cassandra/debian 21x main

_EOF_

# check if file written properly

#cat /etc/apt/sources.list.d/cassandra.sources.list

# add apache cassandra keys

gpg --keyserver keyserver.ubuntu.com --recv-keys 4BD736A82B5C1B00

gpg --export --armor 4BD736A82B5C1B00 | sudo apt-key add -

gpg --keyserver keyserver.ubuntu.com --recv-keys F758CE318D77295D

gpg --export --armor F758CE318D77295D | sudo apt-key add -

#sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 4BD736A82B5C1B00

# update repository

sudo apt-get update

# install

sudo apt-get install -y cassandra

# More sane default configurations - the default 50% free memory allocation is too much for me

if [ "`grep 'MAX_HEAP_SIZE="' /etc/default/cassandra`" == "" ] ; then

sudo tee -a /etc/default/cassandra <<"_EOF_"

# Set the Max Memory used by Cassandra, change to whatever value you like

MAX_HEAP_SIZE="700M"

HEAP_NEWSIZE="200M"

# Performance Tuning

# see also : http://wiki.apache.org/cassandra/PerformanceTuning

JVM_OPTS="$JVM_OPTS -XX:+UseThreadPriorities" # To lower compaction priority

JVM_OPTS="$JVM_OPTS -XX:ThreadPriorityPolicy=42" # To lower compaction priority

JVM_OPTS="$JVM_OPTS -Dcassandra.compaction.priority=1" # To lower compaction priority

JVM_OPTS="$JVM_OPTS -XX:+UseCompressedOops" # enables compressed references, reducing memory overhead on 64bit JVMs

_EOF_

fi;

# restart Cassandra

sudo service cassandra restart

# check Cassandra status

sudo service cassandra status

sudo /etc/init.d/cassandra status

# in case of errors, check the cassandra log files

ls -l /var/log/cassandra/

#total 7228

#-rw------- 1 root root 3193386 Apr 10 14:33 output.log

#-rw------- 1 cassandra cassandra 4194769 Apr 10 14:33 system.log

# less /var/log/cassandra/system.log

# Optional - Get Version Info about the running Cassandra Instance

# 1. check Cassandra version using nodetool (best option)

nodetool -h localhost version

# 2. check Cassandra version using debian package manager

dpkg -s cassandra |grep Version

# 3. check Cassandra version using cassandra-cli and expect module

sudo apt-get install -y expect

expect -c "spawn cassandra-cli;expect \"exit\";send \"quit;\r\n\";"

/etc/init.d/cassandra script I ... Read more

Delete files older than 30 days

1	find . -mtime +30 -exec rm {} \;

1. Save the ... Read more

Going back to the last directory you were in as easy as:

cd -

cd ... Read more

Installation Monit is a great application for monitoring and starting and automatically ... Read more

There are many ways to save a multi line string in bash. This is post just shows ... Read more

DBeaver - Universal Database Manager - Installation

# download and dbeaver

mkdir -p ~/build/dbeaver

cd ~/build/dbeaver

# download

wget http://dbeaver.jkiss.org/files/dbeaver_2.1.1_amd64.deb

sudo dpkg -i dbeaver_2.1.1_amd64.deb

# link beaver executable

sudo ln -s /usr/share/dbeaver/dbeaver /usr/local/bin/dbeaver

# download jdbc drivers - which also include support Cassandra

# also

wget http://dbeaver.jkiss.org/files/driver-pack-2.1.1.zip

unzip driver-pack-2.1.1.zip -d driver-pack

sudo cp -r driver-pack/* /usr/share/dbeaver

# start DBeaver

dbeaver

# No user/password needed for test installation of cassandra

References 1. ... Read more

# create download directories

mkdir -p ~/build/jetty

cd ~/build/jetty

# download

version="9.0.0.v20130308"

wget -O jetty-distribution-$version.tar.gz "http://eclipse.org/downloads/download.php?file=/jetty/stable-9/dist/jetty-distribution-$version.tar.gz&r=1"

# extract the archive - creates directory jetty-distribution-....

tar -xvf jetty-distribution-$version.tar.gz

# rename jetty directory

sudo mv jetty-distribution-$version /usr/local

# create jetty user

sudo useradd -U -s /bin/false jetty

# Copy Jetty script to run as service

sudo chown -R jetty:jetty /opt/jetty

# move jetty.sh to init.d

sudo cp /opt/jetty/bin/jetty.sh /etc/init.d/jetty

# create /etc/default/jetty

sudo sh -c ' printf "

JAVA_HOME=/usr/java/default # Path to Java

NO_START=0 # Start on boot

JETTY_HOST=0.0.0.0 # Listen to all hosts

JETTY_PORT=8080 # Run on this port

JETTY_USER=jetty # Run as this user

" > /etc/default/jetty'

# make webapps writable

sudo chmod o+w /etc/default/jetty/webapps

# check if the installation settings are ok

/opt/jetty/bin/jetty.sh check

# Start Jetty as service

sudo service jetty start

# Start Jetty as service

sudo service jetty stop

# the server runs on the default port of 8080

# http://localhost:8080/

# To let Jetty automatically start on reboot execute

sudo update-rc.d jetty defaults

# deploy an app

cd myapp.war /opt/jetty/webapps

#In case port conflicts, you can check wich application is blocking port 8080

sudo netstat -lnptu|grep ":8080"

# monitor jetty log files

ls -l /opt/jetty/logs

References 1. Home: http://www.eclipse.org/jetty/ 2. ... Read more

Find files by date and regex find the files modified more than 3 days ago ... good ... Read more

Compress files and directories using ZIP

1 2	zip -r mydir.zip mydir zip -r mydir.zip /home/myuser/mydir

the "-r" ... Read more

Add a PPA Example: ppa:e2defrag/ppa

1 2	sudo add-apt-repository -y ppa:e2defrag/ppa sudo add-apt update

Remove ... Read more

the start bash script is among others: /etc/bash.bashrc The aliases file can be ... Read more

The easiest: #Application Menu -> Settings -> Main Menu Otherwise download and ... Read more

The easiest way to install Eclipse in Ubuntu is through the standard repository

1	sudo apt-get install -y eclipse

Unfortunately, ... Read more

Fixes many missing library errors

if [ "`grep '/usr/local/lib' /etc/ld.so.conf`" == "" ] ; then

sudo sh -c ' printf "\n/usr/local/lib" >> /etc/ld.so.conf';

fi;

sudo ldconfig

About Gugulethu Ncube

IT enthusiast getting things done.

Method 1 - rm alias to mv to Trash # in your aliases - e.g. ~/.bash_aliases - add ... Read more

Gugulethu Ncube

me, myself and code

Category Archives: unix

Xfce – Configuration and Tweaks – Getting Started

Disk space – using du to analyse tree and file sizes in Linux

Ubuntu – Add International Language Locales

Python – Spynner – Test Scripts

Unix – Rename Files recursively using a for-loop and find command

Unix – Collection of useful bash aliases

Ubuntu – Removing Unity and Getting Started with Xfce

Ubuntu – How to Install Apple Safari in Ubuntu 12.04, 12.10, 13.10, 14.04, 14.10

redis – Installation and Simple Test using redis-py in Ubuntu

pylibmc – Kestrel Queue Client – Simple Test using Memcache Protocol

beanstalkc – beanstalkd queue – python client library

Beanstalkd – Simple, Fast Queue – Installation

Apache Cassandra CQL3 – Installation and Tests using Python

Unix – Redirect Command Output To A Variable In Bash

Unix – Process and Load monitoring in Linux

Apache Cassandra – Installation in Ubuntu

Unix – Delete files older than a certain number of days using find command

Linux – cd – – move to previous directory in bash shell

Monit – Monitoring and Automatic Server Restart in Linux

Unix – Set Multi-Line Text To A String Variable Or Text File in Bash

DBeaver – Apache Cassandra GUI – Universal Database Manager Installation in Ubuntu

Jetty – Installation on Linux

Unix – Find Files By Age And Timestamp

Unix – zip – Compress a directory including all its files and sudirectories

Ubuntu – Add and Delete a PPA

Linux – Aliases for root user

Linux – XFCE Menu editor and lxmed

Linux – Install Eclipse IDE

Linux – Adding /usr/local/lib to /etc/ld.so.conf

About Gugulethu Ncube

Ubuntu – rm – Delete to Trash