Answer the following questions related to Linux commands:

• List all the directories using echo command only

• List all the files within a directory including hidden files • Display a Calendar for a specific month and year

• What will be the output of the following: who| more who –a cat file name | more ℓs- ℓ > temp

• What options can be used with a grep command? Show output with each option

1. List all the directories using echo command only: You cannot list directories using the echo command alone. You can, however, use the echo command in combination with other commands such as ls and grep to list the directories. For example, you can use the following command to list all the directories in the current directory:

echo $(ls -d */)

This command uses the ls command with the -d option to list only directories and the */ pattern to select only directories. The echo command then outputs the result.

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