Bash Basic Commands

1. Basic Commands:

2. Variables:

• Declaring a variable: variable_name=value
• Accessing a variable: $variable_name

Example:

name="John"
echo "Hello, $name!"

3. Conditionals:

• if statement

if [condition]; them
	# code to execute if condition is true
else
# code to execute if condition is false
fi

Example:

age=18
if [ $age -ge 18 ]; then
 echo "You are an adult."
else
 echo "You are not an adult yet."
fi

4. Loops

• for loops:

for variable in values; do # code to execute for each value done

Example:

fruits=("apple" "banana" "orange") for fruit in "${fruits[@]}"; do echo "I like $fruit." done

5. Functions

• Declaring a function

function_name() {
	#code to execute
}

• Calling a function: function_name

greet() {
	echo "hello $1"
}

greet "ss4njua"

6. Command Line Arguments

• Accessing command line arguments: $1, $2, …

echo "First argument: $1" 
echo "Second argument: $2"

7. File Redirection

echo "Hello, World!" > output.txt
cat input.txt >> output.txt
sort < input.txt > sorted.txt

8. Pipes

• Sending output of one command as input to another command: command1 | command2

ls -l | grep ".txt"
cat file.txt | wc -l

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