To show the owner of a file using the ls command in Linux, you can use the -l option along with the command. The -l option provides a detailed listing of the file or directory, including the owner and group information. Here is an example command:
ls -l file.txt
This will display the detailed information of the file.txt file, including its owner and group. The owner of the file is listed in the third column of the output, and the group is listed in the fourth column. If you want to display only the owner or group of a file, you can use the -o option along with -l, and then use the awk command to print only the desired column. For example, to display only the group of the file, you can use the following command:
ls -l -o file.txt | awk '{print $4}'
This will display the group of the file.txt file.