Bash get filename from given path on Linux or Unix

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How do I extract filename and extension in the Bash shell script from the given path? How can I get filename from the path under the bash shell?

It is possible to get just the filename from a path in a bash shell script running on a Linux or Unix-like systems. One can use any one of the following methods to extract filename or extension in bash.

Bash get filename from given path

The basename command strip directory and suffix from filenames. The syntax is pretty simple:
basename /path/to/file
basename /path/to/file suffix


Let us see how to extract a filename from given file such as /bin/ls. Type the following basename command:
basename /bin/ls
You can pass multiple arguments using the -a option as follows:
basename -a /bin/date /sbin/useradd /nas04/nfs/nixcraft/data.tar.gz
Store outputs in a shell variable, run:

out="$(basename /data/backup-file.tar.gz)"
echo "Filename is $out"

How to remove extesnion from filenames

Remove .gz from backups.tar.gz file and get backups.tar only:
basename /backups/14-nov-2019/backups.tar.gz .gz

basename -s .gz /backups/14-nov-2019/backups.tar.gz
# Bash get filename from path and store in $my_name variable 
my_name="$(basename -s .gz /backups/14-nov-2019/backups.tar.gz)"
echo "Filename without .gz extension : $my_name"

Bash get filename from given path

Extract filename and extension in Bash

From the bash man page:

The ‘$’ character introduces parameter expansion, command substitution, or arithmetic expansion. The parameter name or symbol to be expanded may be enclosed in braces, which are optional but serve to protect the variable to be expanded from characters immediately following it which could be interpreted as part of the name. When braces are used, the matching ending brace is the first ‘}’ not escaped by a backslash or within a quoted string, and not within an embedded arithmetic expansion, command substitution, or parameter expansion. The basic form of parameter expansion is ${parameter}. The value of parameter is substituted.

How to extract filename and extension in bash shell script

For instance, define a shell variable named $input. Let us create a shell script named

# extract config.ini
# get .ini 
# get config 
# print it
echo "Full input file : $input"
echo "Filename only : $file_name"
echo "File extension only: $file_extension"
echo "First part of filename only: $file"

Execute the shell script in Linux, run:
chmod +x

How to Extract Filename & Extension in Shell Script


You learned how to get filename and extension from given path. See “How To Use Bash Parameter Substitution Like A Pro” for more info.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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