Write a script that finds the specified user's home directory by analyzing the system's configuration file. The call syntax is
userhome [-f file] [login]
If the login is not specified, the current user's home is searched. If the file is not specified, '/etc/passwd' is analyzed by default. Suppose that the file format is correct. The file contains a table, each line for each user, and columns are separated by the ':' character. The first column contains the user's login and the sixth one contains the user's home directory.
If the specified login is not found, a corresponding error message should be printed to stderr and the script's exit status should be 1. If the file to analyze does not exist, a corresponding error message should be printed to stderr and the script's exit status should be 2. In case of success, the home directory path should be printed to stdout and the script's exit status should be 0.
Note. Use grep to find the presence and content of the corresponding line. Be aware that the user login might be a substring of any other content (e.g., home directory path) of any other user. Or even be a prefix to another user's login.
$ userhome -f /mnt/sysroot/etc/passwd userlogin
/home/userlogin
Save the script code in a file named userhome, making sure that the file has the execute permission.
Open a terminal and navigate to the directory where the userhome file is located.
Run the script using the ./userhome command followed by the desired options and arguments. For example, to find the home directory of the user userlogin using the passwd file /mnt/sysroot/etc/passwd, run the following command:
./userhome -f /mnt/sysroot/etc/passwd userlogin
The script will search for the user userlogin in the passwd file and print the corresponding home directory to the terminal. If the user is not found or the passwd file does not exist, the script will print an error message and exit with a non-zero exit status.
You can also make the script available in your PATHso that it can be executed from any directory. For example, you could place the userhome file in the /usr/local/bin directory and then run the script using the userhome command from any directory.