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display the line number in a file (vi / vim)

When writing scripts,I often like to insert text into a file at a very specific location/line.
The following lines of code, will
enable rsync
comment out the line starting with default_password_crypted
insert a new line with default_password_crypted in it's place

[root@rhnsat01 ~]# sed -i -e 's/\=\ yes/\=\ no/g' /etc/xinetd.d/rsync
[root@rhnsat01 ~]# sed -i -e 's/default_password_crypted:/#default_password_crypted:/g' /etc/cobbler/settings
[root@rhnsat01 ~]# MYPASS=`openssl passwd -1 -salt 'Passw0rd' 'Passw0rd'`
[root@rhnsat01 ~]# sed -i -e '84i'${MYPASS}'' /etc/cobbler/settings 

In vi, to see the line you are on (I don't know how to turn the numbers back off though ;-)

: set number

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