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Linux Bash Script Check File Existence

How do I check if a file called /tmp/foo.txt exists or not using a shell script under Linux operating systems?

You can use test command or [ to check file types and compare values. The -f option check if FILE exists and is a regular file. If it exists it returns true value. You can test it as follows for a shell prompt itself:
$ [ -f /tmp/foo.txt ] && echo "File Exists" || echo "File not found"

Bash Script To Check If a File Exists

[ $# -eq 0 ] && { echo "Usage: $0 filename"; exit 999; }
if [ -f $file ];
	echo "File $file exists."
		echo "File $file does NOT exists."

Run it as follows:
$ ./script.sh /etc/resolv.conf
File /etc/resolv.conf exists.

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