How to check if a file exists in a Linux bash shell script?

You can use test -e option to check if a file exists in a shell script.

## Check if a file exists
echo "hello world" > file.txt

if [ -e file.txt ]
then
  echo "file exists"
else
  echo "file does not exists"
fi

## Check if a file exists

echo "hello world" > file.txt

if [ -e file.txt ]

then

echo "file exists"

else

echo "file does not exists"

If you want to check if a directory exists then use test -id option

## Check if a directory exists
mkdir mydir

if [ -d mydir ]
then
  echo "dir exists"
else
  echo "dir does not exists"
fi

## Check if a directory exists

mkdir mydir

if [ -d mydir ]

then

echo "dir exists"

else

echo "dir does not exists"

Get all the test option using test manual (man test)