Construct a shell script
A shell script is a script written for the shell or command line interpreter of an operating system. It typically contains a series of commands that the shell will need to execute. Below is a basic example of a shell script that checks if a file exists and prints a message accordingly.

```
#!/bin/bash
# This is a simple shell script

# Define the file to check
FILE="/path/to/file"

# Check if the file exists
if [ -e "$FILE" ]; then
    echo "File $FILE exists."
else 
    echo "File $FILE does not exist."
fi
```

To make this script executable, save it to a file (e.g. `script.sh`) and then run the command `chmod +x script.sh` to make it executable. Then, to run the script, enter `./script.sh` into the command line.

This is just a simple example, but shell scripts can be as complex as needed, and can contain loops, conditional statements, function definitions, and more.
Complete the following task based on the instruction and optional input provided.### Instruction:
Construct a shell script

### Output:
A shell script is a script written for the shell or command line interpreter of an operating system. It typically contains a series of commands that the shell will need to execute. Below is a basic example of a shell script that checks if a file exists and prints a message accordingly.

```
#!/bin/bash
# This is a simple shell script

# Define the file to check
FILE="/path/to/file"

# Check if the file exists
if [ -e "$FILE" ]; then
    echo "File $FILE exists."
else 
    echo "File $FILE does not exist."
fi
```

To make this script executable, save it to a file (e.g. `script.sh`) and then run the command `chmod +x script.sh` to make it executable. Then, to run the script, enter `./script.sh` into the command line.

This is just a simple example, but shell scripts can be as complex as needed, and can contain loops, conditional statements, function definitions, and more.