How to define alias in Linux

1. view ~/.bashrc

It looks like below:

# .bashrc

# Source global definitions

if [ -f /etc/bashrc ]; then

        . /etc/bashrc

fi

# User specific aliases and functions
alias commandA='bash ./test.sh'

2.cd ~

  touch test.sh

  chmod 777 test.sh

  

3.run ~/.bashrc 

[e_dingl@test3tcapprh01 ~]$ . ~/.bashrc

4.in command line, type  "commandA" and enter

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Other Sample : 

# User specific aliases and functions

#Counts for incoming and processed

alias reads='echo -n "Incoming: "; find /home/pipe/Incoming/MultiDrive/MeterReads/ -type f | grep -v "Event" | wc -l; echo -n "Processed: "; find /home/pipe/Processed/MultiDrive/MeterReads/ -type f | grep -v "Event" | wc -l; date'