Bash - Check If File Exists - if [-e FILE] - Tutorial Kart

[Pages:4]Bash ? Check If File Exists ? if [-e FILE]

Bash ? Check If File Exists

Bash Script to Check If File Exists ? To check if file exists in bash scripting, we can use [ -a FILE ] and [ -e FILE ] expressions in bash if statement. [-e FILE] is preferred as [-a FILE] is depreciated.

In this tutorial, we will go through Bash Script examples to check if file exists covering both the above said expressions.

Examples

Example 1 ? Using [ -a FILE ] (Depreciated method to check in bash if file exists.) Example 2 ? Using [ -e FILE ] (Preferred method to check in bash if file exists.)

We shall use a sample.txt file for this example

arjun@arjun-VPCEH26EN:/home/tutorialkart$ ls -lt

total 125012

-rw-r--r-- 1 root

root

12 Oct 5 09:35 sample.txt

Example 1 ? Using [ -a FILE ] expression with if statement

For this example, there is a file /home/tutorialkart/sample.txt present and /home/tutorialkart/dummy.txt not present. We shall demonstrate the result with the help of following example.

#!/bin/bash

# Scenario - File exists if [ -a /home/tutorialkart/sample.txt ]; then

echo "sample.txt - File exists." else

echo "sample.txt - File does not exist." fi

# Scenario - File does not exists if [ -a /home/tutorialkart/dummy.txt ]; then

echo "dummy.txt - File exists." else

echo "dummy.txt - File does not exist." fi

fi

When the above bash shell script is run in Terminal

arjun@arjun-VPCEH26EN:~/workspace/bash$ ./bash-script-if-file-exists sample.txt - File exists. dummy.txt - File does not exist.

Example 2 ? Using [ -e FILE ] expression with if statement

We shall use the same files as in Example 1, but with a new expression [ -e FILE ]

#!/bin/bash # Scenario - File exists if [ -e /home/tutorialkart/sample.txt ]; then

echo "sample.txt - File exists." else

echo "sample.txt - File does not exist." fi # Scenario - File does not exists if [ -e /home/tutorialkart/dummy.txt ]; then

echo "dummy.txt - File exists." else

echo "dummy.txt - File does not exist." fi

When the above bash shell script is run in Terminal

arjun@arjun-VPCEH26EN:~/workspace/bash$ ./bash-script-if-file-exists-2 sample.txt - File exists. dummy.txt - File does not exist.

Conclusion

In this Bash Tutorial ? Bash ? Check If File Exists, we have learnt to check if a specified file exists using [-e FILE] condition.

Bash Shell Scripting Bash Tutorial Bash Script Example

 Bash Script Example Bash File Extension Bash Echo Bash Comments Bash Variable Bash Command Line Arguments Bash Read User Input Bash Read Password Bash Date Format Bash Sleep

Operators Bash Arithmetic Operators

Conditional Statements Bash If Bash If Else Bash Else If Bash Case

Loops Bash For Loop Bash While Loop Bash Until Loop

Strings Bash String Manipulation Examples Bash String Length Bash If String Equals Bash Split String Bash SubString Bash Concatenate String Bash Concatenate Variables to Strings

Functions

Functions Bash Function Bash Override Buitlin Commands

Arrays Bash Array

Files Bash Write to File Bash Read File Bash Read File line by line Bash If File Exists Bash If File is Directory Bash If File is Readable

Bash Others Bash Check if variable is set

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download