Top 15 Shell Script interview questions

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Here are the top 15 Shell Script interview questions that I always get whenever I have an interview:

1. How do you declare a variable in a shell script?

#!/bin/bash
VARIABLE_NAME="VARIABLE_VALUE"
channel="iamsangeetv"

2. How do you make a shell script executable?

chmod +x script.sh
./script.sh

3. How do you pass arguments to a shell script?

#!/bin/bash
echo "First argument: $1"
echo "Second argument: $2"

Usage:

./script.sh shellscript awesome

4. How do you check if a file exists in a shell script?

#!/bin/bash
if [ -e /var/www/html/index.html ]; then
    echo "File exists"
else
    echo "File does not exist"
fi

5. How do you write a loop that iterates over a list of items?

#!/bin/bash
for item in file1 file2 file3; do
    echo $item
done

6. How can you redirect both stdout and stderr to a file?

ls /nonexistent &> output.log