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This Ubuntu machine is showing errors when I start a new terminal. The problem is this:

When bash completion is sourced (. /usr/share/bash-completion/bash_completion) the shell taking place is not bash and some variable definitions with lists local words=() is failing (because only bash understands lists).

My solution was to explicitly call with bash /usr/share/bash-completion/bash_completion, but I'd like to know why another shell is being called when I open terminal. I thought that, since bash is my default, that it would also be used during sourcing.

I've done a echo $0 just before calling the bash-completion file and the output is bash.

What would cause bash not to be used for sourcing?

Addressing questions from comments:

This happens when I start a new console, which means that the kernel will start a new terminal window, calling the ~/.profile, which in its turn do a . "$HOME/.bashrc", which will in its turn source the bash completion (. /usr/share/bash-completion/bash_completion)

I don't have a ~/.bash_completion file.

I can't put the echo "$0" to inside of the bash_completion because it will fail and not be executed.

My .bashrc and .profile are the default ones that come with Ubuntu. I don't have a .bash_profile. You can find them in your local Ubuntu 14.04 under /etc/skel/

  • Please edit your question and explain i) where the source command is. What file? When is it run? ii) if this is a script, show us the script. – terdon May 11 '15 at 16:21
  • Try adding set -x before you source that file. Do you see anything odd? – glenn jackman May 11 '15 at 16:31
  • Do you have a ~/.bash_completion file? – glenn jackman May 11 '15 at 16:32
  • If you want to change your default shell, use the chsh command like so : chsh -s bash. Also, note that sometimes the terminal emulator you use can start a new shell by its own. For instance, in konsole, my default profile starts bash by default (I therefore use bash locally) but I had to use chsh so that my shell would be bash also when I use ssh. – user43791 May 11 '15 at 17:20
  • @user43791 my chsh points to /bin/bash. That is the default. I just checked and it hasn't changed. I don't want to change my default shell, I am trying to find out why would Ubuntu decide to change it to sh instead of bash. – Alexandre Santos May 11 '15 at 20:36
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The problem wasn't the shell or chsh or anything exotic. It was a stupid alias on local. Someone thought it was a good idea to create an alias that displays the local ip address, and named it "local", so the line

local cword words=()

was failing not because the shell couldn't handle arrays. It failed because the alias was expanding and the () didn't make sense there.

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