Useful tab-completion for .bashrc

I was searching for a tab completion in systemd commands such as:
$ systemct <TAB> (this show all possible parameters/flags) and another <TAB> (show all units and itself commands).
Reading posts here and there I found that the following command in .bashrc:
complete -F or -C command
did the trick, but this is awful and painfull cause I need to implement it in all commands, such as, pacman, man, sudo, etc. Ok, googling, I found this usefull script you can put in your .bashrc:
# completion.bash
_vault_complete() {
COMPREPLY=()
local word="${COMP_WORDS[COMP_CWORD]}"
local completions="$(vault --cmplt "$word")"
COMPREPLY=( $(compgen -W "$completions" -- "$word") )
complete -f -F _vault_complete vault
This will complete all your commands with infinite posibilities. (This example use command vault, you can use whatever you want)
I put the link (well explained) here because there is a way to do it in zshell for those interested on it.
http://goo.gl/RFwgK
I hope this can be help someone.
Cheers
Maybe would be useful to put this script on the bashrc wiki.
Last edited by JohnnyDeacon (2013-05-21 13:21:21)

firecat53 wrote:
Just wondering if you actually tested this first...from what I read on the link you provided, this script fragment provided completion for the 'vault' command only if I'm understanding it correctly. In order to make this work for any command, you would have to repeat that shell fragment for _each_ command. Not sure what this gets you over just using 'complete -cf <cmd>'.
I think the author was just explaining how to create a bash completion script for an arbitrary command that could be included along with that command. Most software packages have those bash completion scripts already included. This could be used for a command that doesn't include that script already. If that's what you intended with your post it wasn't clear to me :-)
Scott
Edit: I also just noticed that without even having 'complete -cf systemctl' in my .bashrc, bash is still giving me a list of possible systemctl options when I hit <TAB> after typing systemctl. Ooo, nice! Never noticed that before
complete -cf <cmd> does not complete with flags and parameters.
I have noticed about a script called bash-completion on repos that do completion very well, I'll check it out if it works with all commands.

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enjoy!

shadowhand wrote:
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I am just starting to work with command-line navigation in terminal. They say "tab completion" is a absolute time-saving feature.
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baltwo wrote:
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Last edited by poopship21 (2009-08-03 21:17:20)

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(add-to-list 'load-path
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(require 'color-theme)
(require 'pymacs)
(require 'yasnippet-bundle)
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(color-theme-initialize)
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My first problem is the tab completion for yasnippet is not working. For example in a python file when I type cl then <tab> it doesnt insert the class snippet.
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To my knowledge, yasnippet does not support symbol completion prior to inserting the appropriate template.
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"Complete the symbol at point before expanding with yasnippet."
(interactive)
(let ((yrd yas/root-directory)
completions)
(while yrd
(when (eq (car (file-attributes
(expand-file-name (symbol-name major-mode)
(expand-file-name "text-mode"
(car yrd)))))
t)
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(expand-file-name "text-mode"
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comp)))
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Last edited by chpln (2009-09-27 02:41:46)

PowerShell Script Module PreCache Ignores DefaultCommandPrefix in Manifest - Results in Tab Completion Errors

Refer to this thread for background...
https://social.technet.microsoft.com/Forums/windowsserver/en-US/6507710a-5648-4f52-8d46-3bf6c75ac7f3/module-function-name-resolution-issues-with-defaultcommandprefix?forum=winserverpowershell
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William Busby, PMP

Hi William,
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Get all functions in your module (Load it and check exportedcommands)
loop over each function-name
calculate new name
search your entire project for all references and replace them.
Let me see ...
function Rename-ModulePrefix
[CmdletBinding()]
Param (
[Parameter(Position = 0, Mandatory = $true)]
[string]
$ModuleName,
[Parameter(Position = 1, Mandatory = $true)]
[string]
$OldPrefix,
[Parameter(Position = 2, Mandatory = $true)]
[string]
$NewPrefix,
[Parameter(Position = 3)]
[string]
$Path
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Import-Module $ModuleName -ErrorAction 'Stop'
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if (-not $PSBoundParameters["Path"])
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Cheers,
Fred
There's no place like 127.0.0.1

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I'm currently studying the Peachpit book on OSX Support Essentials and have just arrived at the section concerning tab completion in the Terminal. According to the book, if I start from my home folder, then type P, and then press the Tab key, I should get all the choices available to me within the home folder that start with P. I tried this and it worked for me once. Now, however, after restarting, if I do the same thing, I get only one choice - PPCExplain, which is located in Developer/usr/bin/, and not in my home directory. Thinking a preferences must have gotten screwed up, I deleted the preferences for the Terminal, and restarted - still I get this one result and have no explanation of why this command worked as the book said it would and now it doesn't. I'm quite positive I'm starting from my user folder. Any idea what's going on here? Thanks.

Your terminal is working correctly. In unix-based systems, tab completion is situation-dependent, and for the most part is relative to the root of the drive. If you open a terminal and type P<tab> it will list all commands that are included in your $PATH variable. The $PATH contains file locations (starting from the drive's root) for all the commonly used utilities. To see what the $PATH contains, type the following command in the terminal:
echo $PATH
This command will output something like: /usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin
All the paths listed there are targeted when you enter a command. When you press "P<tab>" the system looks for something in these directories that begins with a "P". The terminal assumes "/usr/bin/", "/bin", and the other paths have already been entered, so typing "P" just completes the path from there.
If you want to run the command "top" which shows all your running processes (similar to activity monitor) is located in the "/usr/bin" directory. Since that directory is in your $PATH, all you have to do is type "top" and press enter. For longer and unique commands you can use tab completion.
Running "top" as described above is the exact same thing as running "/usr/bin/top". This is the command that is actually run, but having the rest of the file path in the $PATH variable makes it easier than having to type out the whole command.
As for directories and user files, they're accessed from the root ("/") as well. If you want to access your user folder and show the contents in it via tab completion, start at the root of your drive, as follows:
/Users/username/<tab>
Press tab twice to show the available commands or paths. If you want to change your current directory to a new folder, type "cd" before the full file path, as such:
cd /Users/username/Desktop
Unix bases everything from the root of the drive as I explained above. However, there are some ways to simplify commands instead of having to type the whole command path before the command itself, or to target a specific file or folder without having to enter the path for the file/folder. These are the period, and the tilde keys: ".", "..", "~".
To reference the current folder, use the ".", and to reference the parent folder type "..". To reference the user home folder type "~". Other than these options, everything is assumed to be referenced from the root of the drive "/".
As such, you can change to your home folder these ways:
cd ~
cd /Users/username
These commands perform the same function. The tilde (~) just indicates the current user's home folder, so you dont have to always enter "/Users/username" whenever you want to target something in your home folder.
Lets take your home folder for example. I'll assume your home's name is "jcoyle".
If you want to reference your desktop, you are currently trying to do it by pressing "D" and the pressing tab. This wont work. To reference your desktop you'll need to start at the root, or at some of the shortcuts provided by Unix (namely the tilde):
/Users/jcoyle/Desktop (references from the full path)
~/Desktop (references from the user's home folder)
Continue to press tab to see all the available targets in the desktop folder, and then enter part of the name of one of them and tab-complete it. You can list contents of folders this way.
Getting back to the periods ("." and ".."), you can reference things relative to your current position. For instance, if you are currently in your Desktop folder, you can change back to your home folder by pressing "cd .." to go up one level. From there you can "cd" into your Movies folder, for example. Alternatively, if you are in your "Desktop" folder you can get to your "Movies" folder directly by typing "cd ../Movies". This tells the computer to go up one level and then target the "Movies" folder that should be there.
Targeting files and folders like this in the Terminal, however, will not do anything unless the final targeted file is an executable binary file (such as a program). You must perform an action (via a program, ie: one of the commands like "cd") on the referenced path in order to do anything.
Think about wanting to open TextEdit. You can open it by entering this command:
/Applications/TextEdit.app/Contents/MacOS/TextEdit
If you are in the "Applications" directory, you can type the command above, or type:
./TextEdit.app/Contents/MacOS/TextEdit
The period references the current directory ("Applications") and then continues the command from there.
Say you want to open a file on your desktop called "file.txt" in TextEdit. With the TextEdit program, if you enter the full path of a target file after the command to open the program then the program will try to open that file. For instance, this full command will open the file "file.txt" in the TextEdit program:
/Applications/TextEdit.app/Contents/MacOS/TextEdit /Users/jcoyle/Desktop/file.txt
Alternatively, this will work:
/Applications/TextEdit.app/Contents/MacOS/TextEdit ~/Desktop/file.txt
(The tilde references the home folder)
If you are currently in the Applications folder, then this command will also do the same thing:
./TextEdit.app/Contents/MacOS/TextEdit ~/Desktop/file.txt
(The period references the Applications folder itself, so you dont have to type the path before where you currently are located)
Lastly, if you are in the Applications folder, then this command will also work:
../Applications/TextEdit.app/Contents/MacOS/TextEdit ~/Desktop/file.txt
(the double period references the folder above where you are. In this case it happens to be the root "/" folder, so the full path ends up being what's entered. However, imagine the TextEdit application is in your Desktop folder. In that case if you wanted to open the application (forget about opening files with it for now) you could type these commands (assuming you have just opened the terminal and are currently in your home folder):
/Users/jcoyle/Desktop/TextEdit.app/Contents/MacOS/TextEdit
./Desktop/TextEdit.app/Contents/MacOS/TextEdit
~/Desktop/TextEdit.app/Contents/MacOS/TextEdit (in this case the tilde is redundant, since you are already at your home folder)
../jcoyle/Desktop/TextEdit.app/Contents/MacOS/TextEdit
../../Users/jcoyle/Desktop/TextEdit.app/Contents/MacOS/TextEdit
The last command invokes two instances of "..", which bring you back two folder levels. In this case, the first would move your reference from "jcoyle" up to the "Users" directory, and from there the second ".." would move you up to the root of the drive "/".
I hope this long-winded explanation clarifies how paths work in Unix-based systems. Just that by default everything is assumed to be referenced from root, and the included file paths in the $PATH variable is why you see the files from those folders when you just press a letter and tab-complete it.
It's very logical, but it can be a bit funky to wrap your head around.

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