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First please show your attempt(s)!
Also please include the school/course information with every new thread.

If you forgo the required error message, this could work for you:
echo "$1's home directory is $(grep $1 /etc/passwd | cut -d: -f6)"
To produce the error checking and message, a serious detour...

Hello edujs7,

IMHO you should open 1 thread for each question, else people who are seeing this thread in future could be confused. So I am answering very first question of yours. Could you please...

Hello edujs7,

In case you want to have only variable names then try following.

env | awk 'BEGIN{FS="="} $1 ~ /.*(NAME$|DIR$|PATH$)/{print $1}'


Thanks,
R. Singh

Hello edujs7,

Could you please try following.


env | awk 'BEGIN{FS="="} $1 ~ /.*(NAME$|DIR$|PATH$)/'


Thanks,
R. Singh

Kindly do not post classroom or homework type of problems in the main forums.

Homework and coursework-related questions should only be posted in this forum...