How do I tell if a regular file does not exist in Bash?

Question

I\'ve used the following script to see if a file exists:

#!/bin/bash

FILE=$1     
if [ -f $FILE ]; then
   echo \"File $FILE exists.\"
else
   echo \"File $         


        

Answer 1

It's worth mentioning that if you need to execute a single command you can abbreviate

if [ ! -f "$file" ]; then
    echo "$file"
fi

to

test -f "$file" || echo "$file"

or

[ -f "$file" ] || echo "$file"

Answer 2

To reverse a test, use "!". That is equivalent to the "not" logical operator in other languages. Try this:

if [ ! -f /tmp/foo.txt ];
then
    echo "File not found!"
fi

Or written in a slightly different way:

if [ ! -f /tmp/foo.txt ]
    then echo "File not found!"
fi

Or you could use:

if ! [ -f /tmp/foo.txt ]
    then echo "File not found!"
fi

Or, presing all together:

if ! [ -f /tmp/foo.txt ]; then echo "File not found!"; fi

Which may be written (using then "and" operator: &&) as:

[ ! -f /tmp/foo.txt ] && echo "File not found!"

Which looks shorter like this:

[ -f /tmp/foo.txt ] || echo "File not found!"