03-03-2019
In addition to what my colleague RudiC already said: please always state your OS, its version, your shell, its version and perhaps other relevant properties of your environment depending on your question. Otherwise you will always be asked for that first without getting any (specific) answer and everybody - including you - loses time.
Every UNIX and Linux is - mostly - the same but "mostly" doesn't mean "completely". Since in our work we often deal with the exceptions rather than the defaults we need to know what exactly you are on if we want to give you more then a generalised and generic answer like RudiC did.
I hope this helps.
bakunin
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