Ubuntu – How to create something similar to an alias, that does properly expand to the initial command

aliasbashcommand line

I have set up aliases for apt-get update, apt-get install, and so on.
Thats quite convenient. But what I really would like to have is something like this:

type agi TAB vi and have it automatically list all packages starting with vi, as it would happen when issuing apt-get install TAB vi.

Would something like this be achievable somehow, maybe by writing a little script?

Best Answer

Bash programmable completion is something I haven't bothered much with myself, but I believe this will do what you want (NB assumes bash version 4.0 or newer. If you run Ubuntu 10.04 or newer, you're good.):

alias agi='apt-get install'
_agi_completion() { 
    mapfile -t COMPREPLY < <(apt-cache --no-generate pkgnames "${COMP_WORDS[COMP_CWORD]}")
}
complete -F _agi_completion agi

Programmable Completion in bash's manual explains how it works, though it's quite complex.

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Ubuntu – Command to determine whether a fullscreen application is running

Kind of extreme overkill as a shell script, but it should do the trick:

#!/bin/bash
WINDOW=$(echo $(xwininfo -id $(xdotool getactivewindow) -stats | \
                egrep '(Width|Height):' | \
                awk '{print $NF}') | \
         sed -e 's/ /x/')
SCREEN=$(xdpyinfo | grep -m1 dimensions | awk '{print $2}')
if [ "$WINDOW" = "$SCREEN" ]; then
    exit 0
else
    exit 1
fi

Then you can check it:

if is-full-screen ; then echo yup, full screen ; fi

As pointed out below, you'll need to install xdotool first:

sudo apt-get install xdotool

Ubuntu – How to decode a base64 string from the command line

Just use the base64 program from the coreutils package:

echo QWxhZGRpbjpvcGVuIHNlc2FtZQ== | base64 --decode

Or, to include the newline character

echo `echo QWxhZGRpbjpvcGVuIHNlc2FtZQ== | base64 --decode`

output (includes newline):

Aladdin:open sesame

Best Answer

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Ubuntu – Command to determine whether a fullscreen application is running

Ubuntu – How to decode a base64 string from the command line

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