In Bash, the
do command is an essential part of creating loops. It is typically used in combination with the
while commands to execute a block of code multiple times. I’m excited to dive deeper into this topic and explore the versatility of the
do command is used to mark the beginning of the block of code that needs to be executed repeatedly. When used in conjunction with the
for command, for example,
do helps in specifying the set of values to iterate over. Similarly, with the
do helps in executing a block of code as long as a specific condition is met.
Example of Using
Let’s consider a scenario where I want to iterate through a list of names and perform an action for each name. In this case, I can use the
for loop in combination with
for name in Alice Bob Charlie; do
echo "Hello, $name"
In this example, the
do command marks the beginning of the block of code to be executed for each name in the list.
Example of Using
Now, let’s explore the usage of
do with the
while command. Suppose I want to keep prompting the user for input until a specific condition is satisfied:
while [ $input != "quit" ]; do
read -p "Enter your input: " input
# Additional logic can be added here
In this case, the block of code following the
do command will be executed repeatedly as long as the condition
$input != "quit" holds true.
Personal Experience with
As someone who has been working with Bash for several years, I can say that the
do command has been a lifesaver in various scripting scenarios. Whether it’s processing a large number of files, handling user input, or performing repetitive tasks, the
do command, in combination with
while loops, has always provided a reliable and efficient solution.
After delving into the intricacies of the
do command in Bash, I am reminded of its fundamental role in enabling the execution of repetitive code blocks. The versatility and usefulness of
while loops make it an indispensable tool in shell scripting. I encourage fellow Bash enthusiasts to continue exploring and leveraging the power of the
do command in their scripting endeavors.