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Issue description

This is a suggestion to include a note about a particular behaviour of the oc client when adding a file as a parameter. 

[student@workstation ~]$ oc create secret generic test1
--from-file=nisim=~/DO280/labs/auth-review/tmp_users
error: error reading ~/DO280/labs/auth-review/tmp_users: no such file or
directory

[student@workstation ~]$ oc create secret generic test1 --from-file
nisim=~/DO280/labs/auth-review/tmp_users
secret/test1 created

[student@workstation ~]$ oc create secret generic test2
--from-file=nisim=/home/student/DO280/labs/auth-review/tmp_users
secret/test2 created

So if we use '--from-file=' - then we must use the full path and not the relative path with the  ~ symbol.

Expected result:

A NOTE describing this behavior could be useful to students.