checking to see if an arg is a file and printing accordingly

 You can check if a command-line argument is a file in a shell script and print a message accordingly using conditional statements. Here's an example using bash:


```bash

#!/bin/bash


# Check if an argument was provided

if [ $# -eq 0 ]; then

    echo "No argument provided. Please specify a file."

    exit 1

fi


# Check if the argument is a file

if [ -f "$1" ]; then

    echo "$1 is a file."

else

    echo "$1 is not a file."

fi

```


This script checks if an argument is provided and then uses the `-f` option within square brackets `[ ]` to test if the argument is a file. If it is, it prints a message indicating that it's a file; otherwise, it prints a message indicating that it's not a file.


Save this script to a file (e.g., `check_file.sh`), make it executable with `chmod +x check_file.sh`, and then run it with a command-line argument:


```bash

./check_file.sh somefile.txt

```


Replace `somefile.txt` with the argument you want to check. The script will respond with whether the argument is a file or not.

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