Useful variables and aliases in bash profile

export NODE_NAME=`hostname -s`
export COMPUTERNAME=`hostname -s`
export ip_addr=`ip -f inet addr show eth0|egrep inet|awk '{print $2}'|awk -F/ '{print $1}'`

export http_proxy=http://www-proxy.us.oracle.com:80
export https_proxy=$http_proxy
export no_proxy=localhost,127.0.0.1,.oracle.com,.us.oracle.com,10.244.0.0,.oraclecorp.com

export HTTP_PROXY=http://www-proxy.us.oracle.com:80
export HTTPS_PROXY=$http_proxy
export NO_PROXY=localhost,127.0.0.1,.oracle.com,.us.oracle.com,10.244.0.0,.oraclecorp.com

export JAVA_HOME=/home/oracle/tools/jdk1.8.0_202
export ANT_HOME=/home/oracle/tools/apache-ant-1.9.13
export MAVEN_HOME=/home/oracle/tools/apache-maven-3.6.0

export ORACLE_HOME=/osmxarth/thirdparty/oracle/product/12.1.0/dbhome_1

export ORACLE_SID=orcl12c

export NO_JAVA_PATH=$ANT_HOME/bin:$M2_HOME/bin:$ORACLE_HOME/bin:$HOME/bin:/sbin:$PATH

PATH=$JAVA_HOME/bin:$NO_JAVA_PATH

alias ipa='ip -f inet -br addr'

alias vi=vim

alias l='ls --color=yes -alh'

alias ll='ls --color=yes -alh'
alias free='free -hltw'
alias free='free -glta' (older ip package)

Useful Yum commands

Few useful yum commands

1. yum list installed - Gives a list of already installed packages
2. yum history list   - Gives a list yum installs. Note that one can install multiple packages and their dependencies in a single invocation. Example, yum install docker-ce, docker-ce-cli
3. yum history info   - Gives the details of yum invocation for each of the historical entry above.
4. /var/log/yum.log - also contains log of yum installs
5. yum list docker-ce --showduplicates | sort -r  - Shows all the versions that are present for docker and sorts them.

To find difference in packages between installs -

• Before installation - 

rpm -qa --qf '%{NAME}.%{ARCH}\n' | sort > old-installed-rpms.txt

• After installation - 

rpm -qa --qf '%{NAME}.%{ARCH}\n' | sort > new-installed-rpms.txt

• Diff - 

diff old-installed-rpms.txt new-installed-rpms.txt | grep '^<'