Utilities

Common setup commands for Mac users

Utility-1: Aliasing

Create a file secrets.env
Save passwords/secrets in the file
```
export SECRET="YourPassword\r"
```
do the following in ~/.bashrc or ~/.bash_profile.
```
source secrets.env
```
The passwords/secrets are now exported in the respective environment variables

Write a function for the alias command:

SSH tunnel (for jupyter, tensorboard)

sshTunnel()
{

kill $(lsof -t -i:$PORT_NO)
expect -c "spawn -ignore HUP ssh -N -L localhost:$PORT_NO:localhost:$PORT_NO username@ip; \
expect \"password\";
send $SECRET;
exit 0"
echo -e "\n"
echo -e "http://localhost:$PORT_NO\n"
open http://localhost:$PORT_NO
}

SSH connection function

sshServerA()
{

expect -c "spawn ssh username@ip; \
expect \"password\";
send $SECRET;
interact"
echo -e "\n\n\n"
}

-ignore HUP runs the process in the background, eliminating the need to maintain a seperate terminal
-ignore HUP is not used in the second script since we want to keep the terminal in interactive mode.

Create alias

alias ssh-serverA=sshServerA
alias jupyter-serverA=sshTunnel

Run the required command in terminal
```
> ssh-serverA
```
or
```
> jupyter-serverA
```

Utility-2: Remove long path structure in terminal

Add the below line in bash rc to gid rid of the long path in terminal
```
PS1='\u:\W\$ '
```

Utility-3: Connect to vpn(using Cisco Anyconnect) via terminal (for Mac Users)

Create a file secrets.env

Add the following lines

export EMAIL="Youremail\r\n"
export PWD="Yourpwd\r\n"

In ~/.bash_profile add the following:

source secrets.env

connectVpn()
{
  expect -c "spawn /opt/cisco/anyconnect/bin/vpn connect vpn-address-here; \
  expect \"Username\";
  send $EMAIL;
  expect \"Password\";
  send $PWD;
  interact"
}

alias connect-vpn=connectVpn

disconnectVpn()
{
  /opt/cisco/anyconnect/bin/vpn disconnect;
}

alias disconnect-vpn=disconnectVpn

In your terminal

For the changes to be effective (one-time)

> source ~/.bash_profile

Before running the below command, quit/force-quit the UI-application

To connect to vpn

> connect-vpn

To disconnect

> disconnect-vpn

Check VPN status

statusVpn()

{
  mystate=$(/opt/cisco/anyconnect/bin/vpn state | grep -c "Connected")

  if [ $mystate -gt 0 ]
  then
    echo "VPN is already connected !!!!!"
    true
  else
    echo "VPN is not connected !!!!!"
    false
  fi
}

alias check-vpn=statusVpn

Utility-4: Using tmux to manage multiple terminals

Start a tmux session
```
tmux
```

Close a session

Ctrl-D or Cmd-D or typing exit on terminal

List sessions
```
tmux ls
```
Attach to a session
```
tmux attach -t 0
```
Detach from a session
```
1. Ctrl-B
2. Type D
```
Giving names to sessions
```
tmux new -s sessionName
```

Rename a session

tmux rename-session -t oldSessionName newSessionName

archmaester/Utilities

Utilities

Utility-1: Aliasing

Utility-2: Remove long path structure in terminal

Utility-3: Connect to vpn(using Cisco Anyconnect) via terminal (for Mac Users)

Utility-4: Using tmux to manage multiple terminals