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Thanks for the answer. Sure, I always forgot to escape my var... Sry. su - root -c "[[ -v HOME ]]" && echo ok || echo no Doesn't work $ su - root -c "[[ -v HOME ]]" && echo ok || echo no -sh: -c: line 0: conditional binary operator expected -sh: -c: line 0: syntax error near HOME' -sh: -c: line 0: [[ -v HOME ]]' For su - root -c 'echo $HOME | ...' I took the habit to escape the var like that su - root -c "echo \$HOME | ..." I don't know which one is the best practice. And omg I didn't think about wc -w ! It does what I wanted to ! Thx

Chuck Noxis
– Chuck Noxis

2016-10-28 13:05:45 +00:00
Commented Oct 28, 2016 at 13:05

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