Linux – How to remove ‘update-alternatives’ links on Linux

centosdebianlinuxsymbolic-link

Sorry for asking this, but I cannot resolve such a simple issue for a few hours:

I made a typo mistake in

update-alternatives --install /usr/lib64/R/lib/libRblapack.so libRblapack.so /usr/lib64/R/lib/libRblapack_native.so 100

It should be libRlapack.so instead of libRblapack. The problem is that if issue a correct command line, i.e.

update-alternatives --install /usr/lib64/R/lib/libRlapack.so libRlapack.so /usr/lib64/R/lib/libRlapack_native.so 100

it returns an error:

the primary link for libRlapack.so must be
/usr/lib64/R/lib/libRblapack.so

I tried

update-alternatives --remove libRblapack.so /usr/lib64/R/lib/libRblapack.so

but it doesn't work – returns the same error when entering a correct command.

How can I get it fixed?

Thanks!

I would try cleaning it up manually. I've never done this so make sure you backup beforehand.

Remove the link from /etc/alternatives
Remove the relevant file from the admin directory
- /var/lib/dpkg/alternatives/ on ubuntu (debian may be the same but check the man pages under the FILES section)
- /var/lib/alternatives/ on CentOS 6&7

As of GNU coreutils 7.5 released in August 2009, sort allows a -h parameter, which allows numeric suffixes of the kind produced by du -h:

du -hs * | sort -h

If you are using a sort that does not support -h, you can install GNU Coreutils. E.g. on an older Mac OS X:

brew install coreutils
du -hs * | gsort -h

From sort manual:

-h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G)

move down fastcgi_pass ; it should be the latest line.

First you should set parameters, only then fastcgi_pass, otherwise you will not get set environment.

fastcgi_pass unix:/var/run/fcgiwrap.socket;