bash

Bourne again shell.

Server loop

   1 #!/bin/sh
   2 # restart the server in case of failure
   3 logger "Starting server.py"
   4 until /usr/bin/python server.py 1234; do
   5     logger "Server crashed with exit code $?.  Respawning.."
   6     sleep 1
   7 done

Add extra IP address to NIC

Adapted from http://unclean.org/howto/secondip.html

Add extra IP 192.168.1.5 to NIC eth0

   1 ifconfig eth0:0 192.168.1.5
   2 route add -host 192.168.1.5 dev eth0:0

Check port running

   1 #!/bin/sh
   2 RES=`netstat -at -n |  grep 0.0.0.0:12345 | wc -l`
   3 if [ $RES -eq '1' ]
   4 then
   5   logger 'Process running'
   6 else
   7   logger 'Process not listening on port 12345'
   8   /sbin/service processx restart 
   9   logger 'Process restarted'
  10 fi

   1 #!/bin/sh
   2 RES=`netstat -at -n |  grep 0.0.0.0:12345 | wc -l`
   3 if [ $RES -ne '1' ]
   4 then
   5   logger 'Process not listening on port 12345'
   6   /sbin/service processx restart 
   7   logger 'Process restarted'
   8 fi

ColorBash prompt

https://wiki.archlinux.org/index.php/Color_Bash_Prompt

start coloring: \[\e[color\]
end coloring: \[\e[m\]
\e[0;32m\] #green color
\e[0;33m\] #yellow color

Network interface data daily

rxtxData.sh:

   1 #!/bin/sh
   2 # chmod 755 rxtxData.sh
   3 # crontab -e
   4 # @daily /root/rxtxData.sh
   5 CURR=`date -u`
   6 DATA=`ifconfig eth0 | grep "RX bytes" | sed "s/:/ /g"`
   7 echo [$CURR] $DATA >> /root/rxtxData.log

SSH Ubuntu bash colors

~/.bash_profile

if [ -f ~/.bashrc ]; then
  . ~/.bashrc
fi

~/.bashrc

alias ls='ls --color'
alias ps='ps faxo pid,user:32,comm'
#PS1="\e[0;33m\]\D{%Y-%m-%d}T\A\[\e[m\] \e[0;32m\]\u@\H:\w\r\n\$\[\e[m\] "
export PS1="\e[0;33m\]\D{%Y-%m-%d}T\A\[\e[m\] \e[0;32m\]\u@\H:\w\r\n\$\[\e[m\] "
PATH=$PATH:/opt/java/jdk1.8.0_162/bin:/opt/java/apache-maven-3.5.3/bin