What would be the effect of the following commands?

a. ls $let/..
b. cat $prop/sys.A >> $let/no.JSK
c. echo $let/*
d. cp $let/no.JSK $progs

Suppose that your HOME directory is /users/steve. Assuming that you just logged in to the system and executed the following commands
$ docs=/users/steve/documents
$ let=$docs/letters
$ prop=$docs/proposals

a. ls $let/..
/users/steve/documents/letters/../memos
/users/steve/documents/letters/../proposals
/users/steve/documents/letters/../letters

b. cat $prop/sys.A >> $let/no.JSK
Appends the contents of sys.A to no.JSK

c. echo $let/*
/users/steve/documents/letters/no.JSK
/users/steve/documents/letters/AMG.reply

d. cp $let/no.JSK $progs
Copy the file no.JSK into the directory /users/steve/programs