A bash script that runs everyday and deletes some unnecessary files using crontab.

1. How to initiate a bash script?
   1. #! /bin/bash
2. How to declare a variable in shell and assign a commands output to it?
   1. variable=$(command)
   2. Please make sure that there is no space on either side on = and the command is always inside a ().
3. How to assign a normal variable ? Just var=”value”
4. How to comment? # this is my comment
5. How to write an if loop?
   1. if [ condition ]; then task else task fi
   2. Note that there should be spaces before condition and [ ].
6. || are used to add condition if the given task fails.
7. How to find a file: find $path_from_where_to_delete -type f (for file) -name *.txt
8. How to find multiple file types?
   1. Just put all types inside a ().
   2. find . -type f (-name *.txt -o (or) -name *.jpg)
9. inside if loop if we have -z followed by condition, it checks if null or empty. we can also use -n to check if it is non empty
10. IFS( internal field seperator) : he IFS variable is used to control the behavior of word splitting, which is how the shell breaks up arguments and input into separate words. In this script, IFS=$'\n' sets the IFS to a newline character (\n).
11. To write a for loop the syntax is : for file in files; do task done

crontab crontab_file.txt

To check : crontab -l

1. Add how much data is being getting free up by this process to monitor the work.
2. Also log all the files that are getting deleted to splunk.