Removing comments and blank spaces

If you want to remove blank lines (using vi):
:g/^$/d

For commented lines (using vi):
:g/^#/d

And for lines where windows editor put ^M and you want to remove (using vi):
:%s/^V^M//g

Note that we cannot just type the accent ^ , instead we must use ^V and then type M, so the final command will look like this (using vi):
:%s/^M//g

The same as above can be reached using egrep:
egrep -v "^#|^$" squid.original > squid.conf

And the same using grep command:
grep -v ^["#"] /etc/squid3/squid.original > /etc/squid3/squid.conf

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Installing PIP in OpenBSD 5.6

pip included with Python Python 2.7.9 and later (on the python2 series), and Python 3.4 and later include pip by default [1], so you may have pip already. Install pip To install pip, securely download get-pip.py: #curl --remote-name https://bootstrap.pypa.io/get-pip.py Then run the following (which may require administrator access): #python get-pip.py If setuptools (or distribute) is not already installed, get-pip.py will install setuptools for you. To upgrade an existing setuptools (or distribute), run pip install -U setuptools.

Instalando Packet Tracer 6.3 no Fedora 23

Vamos começar... 1. Baixe o arquivo desse link: http://www.deltaeridani.com/openssl-lib-compat-1.0.0i-1.fc20.i686.rpm 2. Baixe o Packet Tracer 6.3 do site netacad.com 3. Instale as seguintes dependencies: dnf install libICE.i686 libpng libSM.i686 libX11.i686 libXext.i686 libXi.i686 libXrandr.i686 fontconfig.i686 libgcc.i686 glib.i686 compat-libstdc++-33.i686 libstdc++.i686 glib2.i686 libgthread-2.0.so.0 libglib-2.0.so.0 4. Instale usando o dnf o pacote que voce baixou no item 1: dnf install openssl-lib-compat-1.0.0i-1.fc20.i686.rpm 5. Instalando o Packet Tracer 6.3: tar xfvz PacketTracer63_linux.tar.gz cd PacketTracer63/ sudo su ./install exit 6. Criando o atalho na área de trabalho ( Usando seu usuário padrão ) cp /opt/pt/art/app_student.png /usr/share/icons/ emacs /home/usua...

Configure BASH, KSH, TCSH, ZSH Shell To Logout User Automatically After Idle Time

You can configure any Linux system to automatically log users out after a period of inactivity. Simply login as the root user and create a file called /etc/profile.d/autologout.sh , enter: # vi /etc/profile.d/autologout.sh Append the following code: TMOUT=300 readonly TMOUT export TMOUT Save and close the file. Set permissions: # chmod +x /etc/profile.d/autologout.sh Above script will implement a 5 minute idle time-out for the default /bin/bash shell. You can also create tcsh version as follows: # vi /etc/profile.d/autologout.csh Append the following code: set -r autologout 5 Save and close the file. Set permissions, enter: # chmod +x /etc/profile.d/autologout.csh Dealing with ssh clients SSH allows administrators to set an idle timeout interval. After this interval has passed, the idle user will be automatically logged out. Open /etc/ssh/sshd config file, enter: # vi /etc/ssh/sshd config Find ClientAliveInterval and set to 300 (5 minutes) as follows: ...

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