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I'm using Ubuntu 14.04.5 LTS.

The ssh bash completion on any Host of the file ~/.ssh/config does not work :

$ ssh b2sed: -e expression #1, char 97: invalid reference \2 on `s' command's RHS

The package for the ssh completion, is already installed :

$ dpkg -S /usr/share/bash-completion/completions/ssh
bash-completion: /usr/share/bash-completion/completions/ssh
  • @Kusalananda Thanks, I have just seen that sed is aliased to \sed -E on my system. I'm searching where in the bash-completions scripts, this particular sed call is done ... – SebMa Feb 23 at 17:48
  • @Kusalananda I found a way but I think it is not recommanded, please see my EDIT1 – SebMa Feb 23 at 18:02
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    You should submit a bug report so that it's fixed in the bash-completion package. Your fix is correct and what the function should have used from the start. – Kusalananda Feb 23 at 18:35
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I found that on my system, sed is aliased to sed -E

So instead of removing this alias which I use quite a lot actually, I decided to update the _known_hosts_real function in the /usr/share/bash-completion/bash_completion script (which I think is not really recommanded) :

$ type _known_hosts_real | grep -w sed
        local hosts=$( sed -ne 's/^[ \t]*[Hh][Oo][Ss][Tt]\([Nn][Aa][Mm][Ee]\)\{0,1\}['"$'\t '"']\{1,\}\([^#*?]*\)\(#.*\)\{0,1\}$/\2/p' "${config[@]}" );

by replacing sed -ne by command sed -ne, this way :

# append any available aliases from config files
if [[ ${#config[@]} -gt 0 && -n "$aliases" ]]; then
    local hosts=$( command sed -ne 's/^[ \t]*[Hh][Oo][Ss][Tt]\([Nn][Aa][Mm][Ee]\)\{0,1\}['"$'\t '"']\{1,\}\([^#*?]*\)\(#.*\)\{0,1\}$/\2/p' "${config[@]}" )
    COMPREPLY+=( $( compgen -P "$prefix$user" \
        -S "$suffix" -W "$hosts" -- "$cur" ) )
fi

However, those changes are going to be lost when the bash-completion package gets updated.

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