Need more help with this i am not getting the right solutions. On the bottom, I have included commands I found but are not working or not quite right

Note- I am using a non-gui red hat unix (Linux version 2.6.18-419.el5 (mockbuild@x86-027.build.eng.bos.redhat.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-55)) #1 SMP Wed Feb 22 22:40:57 EST 2017)

4. From your home directory, find all the files associated with group 100. Copy/paste both your command and its output, but not its standard error output. My solution: 2 such files.

5. From your home directory, use egrep/cut/sort to produce a list showing the username and real name of all the students in the /etc/passwd file; the list should be lexicographically sorted by username. Copy/paste just your command for hand-in. My output:

023906973:Hobbs Ryan Thomas 10608634:Yang Zhiqiang 11159827:Chang Jonas . . . zrkerk:"Kerk Zi Rui" . zsj25502:Zheng Jerod Shaojie zuyanhuang:Huang Zuyan

note- I have tried

4.) $ find . -gid 100

$ find .-group admin

find: .-group: No such file or directory

find: admin: No such file or directory

$ gid

-bash: gid: command not found

5.) $ cat /etc/passwd|cut -d':' -f3,1|sort -t':' -k1

cut -f 1,4 -d: /etc/passwd | sort

cut -f 1,5 -d: /etc/passwd | sort

023906973:Hobbs Ryan Thomas

10608634:Yang Zhiqiang

11159827:Chang Jonas

11188087:Ghimire Abhishek

11252383:Tu Tsao-Hsiang

^Need to add an egrep to the command per the assignment, nut not sure why. Looks to be username and real name sorted lexographically. maybe it means to egrep for student account?^