Are there other methods?

Yes, there are several other methods to test for file existence in a Unix-like system. Here are a few common ones:

1. Using test or [ ]

You can use the test command or the [ ] syntax to check if a file exists:

if [ -e path/to/file ]; then
    echo "File exists"
else
    echo "File does not exist"
fi

2. Using [[ ]]

The [[ ]] syntax is a more advanced test command that provides additional features:

if [[ -e path/to/file ]]; then
    echo "File exists"
else
    echo "File does not exist"
fi

3. Using find

You can use the find command to check for a file:

if find path/to/file -type f -print -quit | grep -q .; then
    echo "File exists"
else
    echo "File does not exist"
fi

4. Using ls

You can also use ls to check for a file, but this method is less preferred due to potential output:

if ls path/to/file > /dev/null 2>&1; then
    echo "File exists"
else
    echo "File does not exist"
fi

Summary

Each of these methods can effectively check for file existence. The test or [ ] methods are the most common and straightforward for this purpose.