sed commands help

[ausghostdog]

Working through my uni class and come to the following question

I know
-n = new line
s = substitute
q = quit
g= global
a= append

/ = delimiter

^ = start of a string
$ = end of a string
d = delete

Assume you have a text file called file. Explain what does the following
command-line do.
1. sed "s/the/a/g" file
2. sed -n "s/[A-Z]/&/gp" file = substituting capital alphas and prints
3. sed "32,45 s/[()]//g" file = on line 32 and 45 replace or with nothing?
4. sed "/^$/d" file = remove empty lines from the file?
5. sed "s/\([0-9]\)-\([0-9]\)/\1\2/g" file = removes the - from number 1234-1234 to 12341234
6. sed "80q" file = display the first 80 lines and quit

I'm still working through the chapter in the book, any help understanding would be much loved.

[GreenBeret]

Create a text file and run the commands on it. Duh.

[cleary]

Help me with my homework is naughty - locked