Introduction_to_Bash_Scripting.sh

###############################
# Variables in Bash Scripting #
###############################

### Creating an array

# Create a normal array with the mentioned elements
capital_cities=("Sydney" "New York" "Paris")

# Create a normal array with the mentioned elements using the declare method
declare -a capital_cities

# Add (append) the elements
capital_cities+=("Sydney")
capital_cities+=("New York")
capital_cities+=("Paris")

# Print out the entire array
echo ${capital_cities[@]}

# Print out the array length
echo ${#capital_cities[@]}


### Creating associative arrays

# Create empty associative array
declare -A model_metrics

# Add the key-value pairs
model_metrics[model_accuracy]=98
model_metrics[model_name]="knn"
model_metrics[model_f1]=0.82

# Declare associative array with key-value pairs on one line
declare -A model_metrics=([model_accuracy]=98 [model_name]="knn" [model_f1]=0.82)

# Print out the entire array
echo ${model_metrics[@]}

# Print out just the keys
echo ${!model_metrics[@]}




############################
# Functions and Automation #
############################

### Creating cronjobs

# Create a schedule for 30 minutes past 2am every day
30 2 * * * bash script1.sh

# Create a schedule for every 15, 30 and 45 minutes past the hour
15,30,45 * * * * bash script2.sh

# Create a schedule for 11.30pm on Sunday evening, every week
30 23 * * 0 bash script3.sh