How to Extract Filename & Extension in Shell Script

Some times you may require to extract filename and extension in different variables to accomplished a task in bash shell programming. This article will help you to extract filename and file extension from a full file name or path.
Below is the step by step details:

1. Get Filename without Path:

First remove the full file path from input filename. For example if filename input is as /etc/apache2/apache2.conf then extract full filename apcahe2.conf only.

#!/bin/bash  fullfilename="/etc/apache2/apache2.conf" filename=$(basename "$fullfilename") echo $filename 

2. Filename without Extension:

Now extract filename without extension from extracted fullfilename without path as above.

#!/bin/bash  fullfilename="/etc/apache2/apache2.conf" filename=$(basename "$fullfilename") fname="${filename%.*}" echo $fname 

3. File Extension without Name:

Now extract file extension without name from extracted fullfilename without path.

#!/bin/bash  fullfilename="/etc/apache2/apache2.conf" filename=$(basename "$fullfilename") ext="${filename##*.}" echo $ext 

4. Testing:

Finally test all the things in a single shell script. Create a new script file using following content. Filename will be passed as command line argument during executing script.

#!/bin/bash  fullfilename=$1 filename=$(basename "$fullfilename") fname="${filename%.*}" ext="${filename##*.}"  echo "Input File: $fullfilename" echo "Filename without Path: $filename" echo "Filename without Extension: $fname" echo "File Extension without Name: $ext" 

Let’s execute the script with filename as command line argument.

$ ./script.sh /etc/apache2/apache2.conf  Input File: /etc/apache2/apache2.conf Filename without Path: apache2.conf Filename without Extension: apache2 File Extension without Name: conf 

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