TweetFollow Us on Twitter

Mac in the Shell: Pashua: Helping the GUI Crowd

Volume Number: 23 (2007)
Issue Number: 12
Column Tag: Mac in the Shell

Mac in the Shell: Pashua: Helping the GUI Crowd

Give your shell scripts a GUI

by Edward Marczak


In the August 2006 issue of MacTech, I wrote an Mac in the Shell: Pashua: Helping the GUI Crowd, "GUI-up Your Script." It talked about ways to add a GUI to your shell script using AppleScript Studio, part of XCode. As we saw in that article, now on-line at
, there are pros and cons to the shell scripter using this method. Since a year is an eternity in technology-time, I'm back to talk about some notable alternatives. My current fave? Pashua. Read on to see how you can use Pashua to add a GUI to your shell script.

What's Happening

The reasons for creating a GUI for a shell script remain the same: you're a shell scripter, but the person running the script is a GUI-type. Perhaps it's just a nicer way to ask for input. In any case, it's a powerful combination.

Before I get into Pashua, I'd like to mention some alternatives. Platypus ( is a wrapper that will take a shell script and construct the necessary bundle structure to make the script a 'regular' double-clickable OS X ".app". Useful, in some cases, to create 'droplets' and to allow end-users to run shell scripts at login time via their Login Items. (Though, we'd never do that as good admins, we'd use launchd, right?). CocoaDialog (, true to its name, allows the shell scripter to create dialogs. Not quite full windows. Think "error dialog" or "progress dialog." However, many times, that's precisely what you need, so, CocoaDialog exists, says what it does, and does a good job doing what it says.

However, Pashua is a bit more. Pashua will let you construct full windows, using most common GUI widgets. The best thing about Pashua is the ease in which you can get data in and out of the windows you create. Let's get started!

Good Times

First, go download Pashua itself at From there, drop the distribution someplace logical (to your situation). We're shell people, right? So, get into Terminal, if you're not there already, and change into the new Pashua folder. From there, we'll dig into the bundle. Really, all you need to know is that from the shell you'll need the Pashua binary, located at You may want to get this into your current $PATH so you can simply type Pashua from now on, but I'll leave that up to you. Go on and run that if you like - you'll receive the dialog show in figure 1.

Figure 1 - Ah, we need a config file.

As evidenced by the error dialog, Pashua is driven entirely by a config file. The config file is nothing esoteric - it's simply a text description that describes the window layout. Let's start with the easiest definition. Fire up your favorite text editor, and enter this:

uname.type = textfield
uname.label = Enter the user ID
uname.default = User ID
uname.width = 340

Save it as win_test.pash. This tells Pashua that we want a new element named "uname" to be created. The "uname" element will be a text field. It will have a label above the text field that says, "Enter the user ID", and will have default text of "User ID". Finally, we create the width of the field to be 340 pixels.

Enough chit-chat - let's run it. If you did get Pashua into your path, simply type:

Pashua win_test.pash

(If you didn't get it into your path, specify the full path to the Pashua binary instead. Something like: /Applications/Pashua/

...and we're greeted with this:

Figure 2 - Our "Hello World" example.

Now, press the return key, or click the "OK" button. Notice what happens in the shell:

$ Pashua win_test.pash 
uname=User ID

That's right! Pashua simply takes the values of all elements and hands them to you on standard out. For shell scripters, this is a relief! Standard in and standard out: that's how shell scripting works! If you've tried to interface with AppleScript, you'll know that passing values back and forth is a huge pain in the patoot. Pashua is a shell-scripters GUI tool more than a GUI tool that simply has 'support' for scripting languages. So, onward!

Let's go for some eye candy. I'm going to put the MacTech logo in the header, and name the Window. Insert this above the lines already in win_test.pash:

# Set the window title
*.title=MacTech Utility
# Display an image
img.type = image
img.path = /Users/Shared/images/mt_logo.gif
img.border = 0

...and again, we display our window (Pashua win_test.pash) and see the results in figure 3.

Figure 3 - Ooooooh, fancy

After clicking OK, note that our output hasn't changed, as we haven't added any elements that accept input. You probably picked up that the hash mark ("#") denotes a comment, and Pashua will ignore any line beginning with one. Additionally, the "*" "element" affects the entire window itself. In addition to the title, so it's not "Pashua", you can also change the following window elements:

transparency: Sets the window's transparency, decimal value from 0 (invisible) to 1 (opaque)

appearance: Only allowed value is metal, which will create a "brushed metal" window. Under Leopard, "metal" creates a single, large "unified" window.

autoclosetime: If autoclosetime is set to an integer number larger than 1, the dialog will automatically close after the specified number of seconds have passed. Note that if a window auto-closes, no values are passed back.

floating: Setting floating to 1 will result in the window floating above other windows. (Note: does not work on Mac OS X 10.2)

x: Sets the horizontal position where the window should be opened on the screen (0 is the left border of the screen)

y: Sets the vertical position where the window should be opened on the screen (0 is the upper border of the screen)

Frankly, "title" is about all I use, as I like the auto-positioning on the screen, and I never seem to have need of the other attributes, but you may.

If you want to let a user bail out of an action, add a cancel button to the window:

cb.type = cancelbutton
cb.label = Cancel
cb.tooltip = Closes this window without taking action

Run our test window with this in the config file, but note the output when you cancel:

$ Pashua win_test.pash 

If the cancel button is invoked - either by clicking or pressing the escape key, all values are discarded, and only the cancel button variable is returned.

The Love Boat

How about getting data in and out of our Window? Let's look at a few practical examples, starting with getting data out. We've already seen that Pashua returns its data on standard out. For the sake of it, let's add one more element, a checkbox. Add these lines beneath the textfield definition:

alter_account.type = checkbox
alter_account.label = Alter Account?
alter_account.tooltip = Checking this box will alter the account

Save, and now check out our window. Enter some data, and click the "OK" button. Notice the output:

$ Pashua win_test.pash 
uname=User ID

While that may be great for viewing on standard out in the shell itself, it doesn't help us too much in a script. To handle this gracefully, we really need to be in a script, which is where we want to be anyway. Let's look at a small, semi-robust wrapper script:

#!/usr/bin/env bash
if [ -N $1 ]; then
        echo "You need to supply the Pashua config file";
        exit 1
result=`/Users/marczak/Applications/Pashua/ $1 | sed 's/ /;;;/g'`
# Parse result
for line in $result
        key=`echo $line | sed 's/^\([^=]*\)=.*$/\1/'`
        value=`echo $line | sed 's/^[^=]*=\(.*\)$/\1/' | sed 's/;;;/ /g'`
        eval $varname='$varvalue'

Save this a, and call it like this, with our sample window:

./pwrapper win_test.pash

Enter some data and click "OK". What happened? Seemingly nothing. No apparent output from Pashua. What's actually happening is that our wrapper script is capturing the output and assigning it to variables within the script. Those variables are now available to us directly. Now, the value passed back from uname is available in "$uname". While this wrapper script solves many problems for us, it doesn't go the distance if we need to dynamically create windows. For that, we need to use a little string creation and concatenation.

Fantasy Island

Following this article is a "complete" script that gathers local user accounts for a fictitious migration/alteration (Listing 1). The idea here is to show off Pashua, and not come up with a user-altering utility. The new bit here is that we create a drop-down menu that we populate dynamically at runtime.

The final window appears in figure 4. Note that the only output is generated purposefully by our script:

$ ./ 
Converting user marczak
Also altering account

Figure 4 - Window with drop-down menu, generated dynamically.

The Gong Show

While this but scratches the surface of all that you can do with Pashua, I hope it was a helpful introduction that kick-starts your thoughts (and typing fingers!). Read the documentation included with the download for other elements that can be put into a window. Also, in the Examples folder, you'll find an application bundle that shows how to create a double-clickable app - all using your shell script and Pashua. If you're not a bash scripter, remember, Pashua accepts a text file as input, and sends its output via standard out. That's very friendly to any scripting language - Perl, Python, Ruby and more. There's even an AppleScript example.

Media of the month: Project management is my focus this month, and there are a lot of good books out there. Think about everything we do, and how many we could classify as "projects." Peruse your local bookstore's shelf for a project management title that suits you. I'm currently finishing up "The Zen Approach to Project Management: Working From Your Center to Balance Expectations and Performance" by George Pitagorsky. The "Zen" part of this title isn't to be taken lightly, and isn't being used as a fashion piece as many others do. This book won't teach you project management techniques per se, but it will teach you, using Zen "centering" exercises how to see the big picture when managing a project. Highly recommended, but only after you have some project management knowledge.

Here comes Macworld! One month away. I'll be presenting two (maybe three) topics this year. I'm leading a hands-on lab on Wednesday that teaches how to get started using the shell. So many people don't even know where to start at all, but know there's power at that cursor starting back at them. I'll also be presenting OS X Server Collaboration Tools, also on Wednesday along with Ben Greisler. This will talk about all the new features in Leopard server like iCal server, the new Wiki and more. Finally, I may be sitting in with Schoun Regan to talk about Kerberos on Tuesday in the Power Tools session, which will be informative if I'm there or not. Of course, don't miss the MacTech booth, where I'll be popping up at from time to time. Hope to see everyone in San Francisco!

Ed Marczak owns and operates Radiotope, a technology consulting practice. Think technology is dy-no-myte? Find out more at


Community Search:
MacTech Search:

Software Updates via MacUpdate

AirPort Utility 6.3.6 - Set up and manag...
Note: Most recent release available only within OS X 10.11 El Capitan update. Use AirPort Utility to set up and manage your Wi-Fi network and AirPort base stations, including AirPort Express, AirPort... Read more
Quicksilver 1.3.1 - Application launcher...
Quicksilver is a light, fast and free Mac application that gives you the power to control your Mac with keystrokes alone. Quicksilver allows you to find what you need quickly and easily, then act... Read more
Tidy Up (Five Users) 4.1.5 - Find duplic...
Tidy Up is a complete duplicate finder and disk-tidiness utility. With Tidy Up you can search for duplicate files and packages by the owner application, content, type, creator, extension, time... Read more
Mellel 3.4.3 - The word processor of cho...
Mellel is the leading word processor for OS X and has been widely considered the industry standard since its inception. Mellel focuses on writers and scholars for technical writing and multilingual... Read more
Skype - Voice-over-internet p...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
Bookends 12.6.0 - Reference management a...
Bookends is a full-featured bibliography/reference and information-management system for students and professionals. Access the power of Bookends directly from Mellel, Nisus Writer Pro, or MS Word (... Read more
Apple iBooks Author 2.4 - Create and pub...
Apple iBooks Author helps you create and publish amazing Multi-Touch books for iPad. Now anyone can create stunning iBooks textbooks, cookbooks, history books, picture books, and more for iPad. All... Read more
Web Snapper 3.3.9 - Capture entire Web p...
Web Snapper lets you capture Web pages exactly as they appear in your browser. You can send them to a file as images or vector-based, multi-page PDFs. It captures the whole Web page - eliminating the... Read more
Tunnelblick 3.6beta10 - GUI for OpenVPN...
Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X. It provides easy control of OpenVPN client and/or server connections. It comes as a ready-to-use application with all... Read more
EtreCheck 2.5.1 - For troubleshooting yo...
EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support... Read more

Camel Up (Games)
Camel Up 1.0.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0.0 (iTunes) Description: | Read more »
The Martian: Bring Him Home (Games)
The Martian: Bring Him Home 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Based on the best selling novel and critically acclaimed film, THE MARTIAN tells the story of Astronaut Mark... | Read more »
This Week at 148Apps: September 21-30, 2...
Leap Into Fall With 148Apps How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you're looking for. The ones we love become Editor’s Choice, standing out above... | Read more »
Tweetbot 4 for Twitter (Social Networki...
Tweetbot 4 for Twitter 4.0 Device: iOS Universal Category: Social Networking Price: $4.99, Version: 4.0 (iTunes) Description: *** 50% off for a limited time. *** | Read more »
Mori (Games)
Mori 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Stop, rewind and unwind with Mori. Time is always running, take a moment to take control. Mori is an action puzzle game about infinitely... | Read more »
100 Years' War (Games)
100 Years' War 1.0 Device: iOS Universal Category: Games Price: $3.99, Version: 1.0 (iTunes) Description: | Read more »
Tower in the Sky (Games)
Tower in the Sky 0.0.60 Device: iOS Universal Category: Games Price: $1.99, Version: 0.0.60 (iTunes) Description: | Read more »
hocus. (Games)
hocus. 1.0.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0.0 (iTunes) Description: New, polished, mind-bending, minimal puzzle game with dozens of levels and extra-ordinary design Features:- Beautifully crafted... | Read more »
Mos Speedrun 2 (Games)
Mos Speedrun 2 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Mos is back, in her biggest and most exciting adventure ever! Wall-jump to victory through 30 mysterious, action packed levels... | Read more »
3D Touch could be a game-changer, but it...
Were you one of the lucky/financially secure enough ones to buy a new iPhone 6s or iPhone 6s Plus over the weekend? Yup, me too (I’m not convinced I was either of those two things, but let’s go with lucky for now), so I thought I’d delve into just... | Read more »

Price Scanner via

Apple refurbished iPad Air 2s available for u...
Apple has Certified Refurbished iPad Air 2s available for up to $140 off the price of new models. Apple’s one-year warranty is included with each model, and shipping is free: - 128GB Wi-Fi iPad Air 2... Read more
Save up to $100 on Mac AppleCare Protection P...
Adorama has 3-Year AppleCare Warranties on sale for up to $100 off MSRP including free shipping plus NY & NJ sales tax only: - Mac Laptops 15″ and Above: $249 $100 off MSRP - Mac Laptops 13″ and... Read more
Updated Mac Price Trackers
We’ve updated our Mac Price Trackers with the latest information on prices, bundles, and availability on systems from Apple’s authorized internet/catalog resellers: - 15″ MacBook Pros - 13″ MacBook... Read more
12-inch MacBooks in stock for up to $120 off,...
Adorama has 12″ Retina MacBooks in stock for up to $120 off MSRP including free shipping plus NY & NJ sales tax only. For a limited time, Adorama will include a free Apple USB-C to USB Adapter,... Read more
15-inch 2.2GHz Retina MacBook Pro on sale for... has the 15″ 2.2GHz Retina MacBook Pro on sale for $1799 including free shipping. Their price is $200 off MSRP, and it’s the lowest price available for this model (except for Apple’s $1699... Read more
iPhone 6s and 6s Plus Feature Improved Durabi...
Upgraded components in the new iPhone 6s Plus cost $16 more than the components in the earlier iPhone 6 Plus according to a preliminary estimate from IHS Inc. The bill of materials (BOM) for an... Read more
13-inch Retina MacBook Pros on sale for up to...
Adorama has 13″ Retina MacBook Pros on sale for up to $130 off MSRP. Shipping is free, and Adorama charges sales tax for NY & NJ residents only: - 13″ 2.7GHz/128GB Retina MacBook Pro: $1199.99 $... Read more
Apple refurbished 2014 13-inch Retina MacBook...
Apple has Certified Refurbished 2014 13″ 2.6GHz/128GB SSD Retina MacBook Pros available $979, $320 off original MSRP. An Apple one-year warranty is included, and shipping is free: - 13″ 2.6GHz/128GB... Read more
iOS 9 Reflections Ten Days In – The ‘Book Mys...
I’ve never been much of an early adopter by philosophy or temperament, although I did buy the iPad Air 2 I’m typing this column on last fall only about a month after Apple unveiled it. However, my... Read more
Apple refurbished Time Capsules available for...
Apple has certified refurbished Time Capsules available for $120 off MSRP. Apple’s one-year warranty is included with each Time Capsule, and shipping is free: - 2TB Time Capsule: $179, $120 off - 3TB... Read more

Jobs Board

Senior Payments Security Manager - *Apple*...
**Job Summary** Apple , Inc. is looking for a highly motivated, innovative and hands-on senior payments security manager to join the Apple Pay security team. You will Read more
*Apple* Solutions Consultant - Retail Sales...
**Job Summary** As an Apple Solutions Consultant (ASC) you are the link between our customers and our products. Your role is to drive the Apple business in a retail Read more
*Apple* Site Security Manager - Apple (Unite...
**Job Summary** The Site Security Manager is a high-profile security position at Apple . The Site Manager is the face of Apple Global Security (GS) and primary point Read more
*Apple* Fulfillment Operations Execution Ana...
**Job Summary** The AMR Apple Fulfillment Operations Team is seeking a talented team player to drive the Apple Online Store (AOS) fulfillment performance to ensure a Read more
*Apple* Distinguished Educator (ADE) Communi...
**Job Summary** Apple is seeking candidates for a new position on the Apple Distinguished Educator (ADE) Program team as ADE Community Support Manager. Join a team Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.