How to Check if File Exists in Bash

Quick Answer: Check if File Exists in Bash

To check if a file exists in Bash, use the -f operator: if [ -f "$file" ]; then. For directories, use -d. These operators work with absolute and relative paths and are safe even if the file doesn’t exist.

Quick Comparison: File Existence Testing Methods

Operator	Tests For	Usage	Returns True If
-f	Regular file	[ -f "$file" ]	File exists and is regular
-d	Directory	[ -d "$dir" ]	Directory exists
-e	Any path	[ -e "$path" ]	Any file or directory exists
-L	Symbolic link	[ -L "$link" ]	Symbolic link exists
-s	Non-empty file	[ -s "$file" ]	File exists and has size > 0

Bottom line: Use -f for files, -d for directories, -e for either.

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Check if files and directories exist in Bash.

Method 1: Test if File Exists

file="/home/user/file.txt"

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

Method 2: Test if Directory Exists

dir="/home/user"

if [ -d "$dir" ]; then
  echo "Directory exists"
fi

Method 3: Test if Path Exists

path="/some/path"

if [ -e "$path" ]; then
  echo "Path exists (file or directory)"
fi

File Test Operators

Operator	Test
-f	Regular file exists
-d	Directory exists
-e	Path exists
-r	File is readable
-w	File is writable
-x	File is executable
-s	File is not empty
-L	File is symbolic link

Practical Examples

Check Before Reading

file="$1"

if [ ! -f "$file" ]; then
  echo "ERROR: File not found: $file"
  exit 1
fi

cat "$file"

Check Before Writing

output_file="output.txt"

if [ -f "$output_file" ]; then
  echo "File already exists"
  read -p "Overwrite? (y/n) " answer
  [ "$answer" != "y" ] && exit 1
fi

echo "Writing data..." > "$output_file"

Check if File is Empty

file="data.txt"

if [ ! -s "$file" ]; then
  echo "File is empty"
fi

Check if File is Readable

file="/etc/passwd"

if [ -r "$file" ]; then
  echo "File is readable"
fi

Combined Tests

file="script.sh"

if [ -f "$file" ] && [ -x "$file" ]; then
  ./$file
else
  echo "File not found or not executable"
fi

Recommended Pattern

Always quote variables and use -f for files:

if [ -f "$file" ]; then
  # File exists
else
  echo "File not found"
fi