Hi,
Bill Cunningham wrote:
> I have been trying to use rpm or dnf to remove some rpms.
I'd use dnf. It provides a much wider safety net.
You can do this with rpm as well, but it requires greater care.
> Here is
> an example of what I have been trying to do, ex:
>
> list.txt,
>
>
> gcc-devel // example,
>
> python-devel //example
>
> rpm -e // would this list content be redirectable to rpm -e ?
>
> cat list.txt
>
> lists rpms,
>
> rpm -e < cat list, or
>
> cat list | rpm -e
>
> do not work.
Indeed, rpm doesn't take the list of packages on stdin. You
can use a number of techniques here (we all develop our
favorite habits, but knowing "there is more than one way to
do it"™ is always handy.
Here's how I setup a test:
$ printf '%s\n' gcc-devel python-devel >/tmp/list
$ cat /tmp/list
gcc-devel
python-devel
You could use xargs:
$ xargs sudo dnf remove </tmp/list
This will display the 'dnf remove' output, showing you what
it would do. Then it will exit immediately because there is
no way for it to read the 'Is this ok [y/N]:' prompt. You
can run it again with the '-y' option.
Another way to feed the list to dnf (or rpm) is to use
command substitution:
$ sudo dnf remove $(cat /tmp/list)
Bash¹ has a shortcut for that cat usage which is slightly
faster:
$ sudo dnf remove $(< /tmp/list)
¹ Other shells likely have this is something similar, but
I'm not familiar with them offhand
A for loop works too, but that doesn't work very well when
there are interdependent packages in the list (particularly
with rpm, but even with dnf it can cause problems). It's
also a _lot_ slower to run the rpm or dnf command multiple
times instead of once.
That's just two ways to go about it. Hopefully they help.
--
Todd
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