bash变量扩展，用于完成scp选项卡

Question

I use ssh at work and recently switched to Linux on my local work machine. As a result, I now have to fully-qualify the hostname (ie instead of dev1 I need to use dev1.megacorpnetworkdomain.com). This gets rather annoying for scp. I already have auto-completion set up for remote paths. What I tried to do is create a variable alias for the path:

WORK='user@dev1.megacorpnetworkdomain.com:/home/user'

The problem is now scp fails to do remote completion when I do the following:

scp $WORK/<tab>

Whereas the following performs remote completion correctly:

scp user@dev1.megacorpnetworkdomain.com:/home/user/<tab>

I tried to naively work around this by using complete :

_scp_expand_vars () {
    COMPREPLY=()
    local cur=${COMP_WORDS[COMP_CWORD]}
    eval cur=$cur
    COMPREPLY=( $cur )
    return 0
}
complete -F _scp_expand_vars scp

This now correctly expands variables for scp, but breaks the original functionality of remote directory expansion. How could I achieve both? I'm assuming the original functionality is handled by _scp_remote_files function based on a bit of online research?

Answer 1

For one, if you regularly access hosts under megacorpnetworkdomain.com, you should put it in /etc/resolv.conf; there should be a line:

search megacorpnetworkdomain.com

Then you can use all hosts by just referencing the short hostname, ie dev1 in any program.

For ssh you can follow the advice of Etan Reiser, an example looks like this:

Host dev1
    HostName dev1.megacorpnetworkdomain.com
    User user

When you use ssh or scp they will offer you the choices defined there with tab completion as usual.