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Sample reproducer:

$ source scl_source enable devtoolset-9 2>/dev/null
Can't read /etc/scl/conf/devtoolset-9, devtoolset-9 is probably not installed.

  Other than the help string, it should redirect other echo
calls to stderr, like in the pseudo patch:

-        echo "Can't read $_scl_prefix_file, $arg is probably not installed."
+        echo "Can't read $_scl_prefix_file, $arg is probably not installed." 1>&2

  This would make it have the same behavior for example, as

$ scl enable devtoolset-9 ...

that prints a similar message to stderr if the collection is not
available.

Upstream PR: https://github.com/sclorg/scl-utils/pull/36

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (scl-utils bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4308