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As far as I recall only one argument can be passed - a count of the package versions.

See Fedora - Defining installation scripts...

The short answer is - in theory the --justdb option is not intended to run any pre or post scripts and care is taken in the reference version of RPM to ensure that only database-related actions...

Too lazy to use ", safe if $ip is blank but not if it is "x x"!

if [[ "$ip" = "127.0.0.1" ]]; then

-z is empty string, see man test.

remove the x , make a test with an empty ip and see what happen ...



---------- Post updated at 10:09 PM ---------- Previous update was at 10:07 PM ----------




if $ip is empty :
[[...

x doesn't have special meaning it is here just in case $ip is empty

-z means if empty (z stand for a zero length)

backtick `` means pass the result as a variable in old fashion
Using $() is new fashion (some shell implementation may not support this way to write things

Well, '`' is small (hard to see/discern from "'"), vi '%' does not pair them, and it
does not nest. I am not sure if it swallows linefeeds -- probably. So, good style is to use ksh and $(). Also,...

Have a look at rpm5.org (http://rpm5.org/). In particular, Ed Bailey's book Maximum RPM (http://rpm5.org/docs/max-rpm.htm) and Eric Foster-Johnson' book RPM Guide...

Yes, RPMs can contain scripts for pre/post installation/removal. Those can only be added when building the package through the .spec file.