Bash check environment var is set fails doesn't work

Question

just playing around on my server to get script the setup of the next server. Everything works - now I want to run it on the new server i got an error like this:

sudo sh setup.sh Hostname is dinozzo setup.sh: 10: setup.sh: [[: not found

The Script to start is not that much. Line 10 is

if [[ "$INT_DEV_HOSTNAME" ]]; then

But I don't get it why it is not working on Ubuntu 14.04.5 LTS.

The question was already answered here stackoverflow.com/questions/3601515/… — agg3l
– agg3l, Commented Oct 21, 2016 at 14:06
sh is not the same as bash. [[ is a bash-ism -- so execute the script with bash instead. — FatalError
– FatalError, Commented Oct 21, 2016 at 14:06

Gilles Quénot · Accepted Answer · 2016-10-21 14:19:59Z

You explicetly tell the shell to use sh :

sudo sh setup.sh Hostname is dinozzo setup.sh: 10: setup.sh: [[: not found

In this mode, even if it's bash that you are using by default, it will produce the error because it will be in POSIX mode.

[[ ]] form of test need to be called from within a bash shell (other shells support it too, like ksh, zsh...)

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