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Top Forums UNIX for Beginners Questions & Answers Bash find version of an installed application but if none is found set variable to App Not Installed Post 303040309 by greavette on Saturday 26th of October 2019 10:54:59 AM
Old 10-26-2019
Bash find version of an installed application but if none is found set variable to App Not Installed

Hello Forum,

I'm issuing a one line bash command to look for the version of an installed application and saving the result to a variable like so:

Code:
APP=application --version

But if the application is not installed I want to return to my variable that the Application is not installed. So I'm looking for a command something like the following:

Code:
APP=application --version &&  echo "Application is not installed";

Or perhaps a better way to find this would be to look at when the application was installed using:

Code:
rpm -aq --last | grep <application>

Where I would again want the result to show either the app installed version and date and if not found return the text "Application is not installed".

What is the correct syntax of this one line command to gather the information I need into my $APP variable?

Thank you.
 

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GSMARKUPBROWSER.APP(1)					      General Commands Manual					    GSMARKUPBROWSER.APP(1)

NAME
GSMarkupBrowser.app - GNUstep Development Framework SYNOPSIS
GSMarkupBrowser.app [FILE] DESCRIPTION
This manual page documents briefly the GSMarkupBrowser.app utility. This manual page was written for the Debian distribution (based on the program's README file) because the original program does not have a manual page. GSMarkupBrowser.app is a GNUstep Renaissance utility that allows a developer to review the look and feel of a GUI based on its GNUstep Renaissance Markup Language file (gsmarkup for short.) This allows the designer to develop the layout without having to actually have working code to run the program. Of course, the GUI is just for visual inspection -- it does not support any functional use of the application. Renaissance was written by Nicola Pero (n.pero@mi.flashnet.it) and is part of the GNUstep project (http://www.gnustep.org). GNUstep Renaissance home page is at http://www.gnustep.it/Renaissance. AUTHOR
This manual page was written by Brent A. Fulgham <bfulgham@debian.org>, for the Debian project (but may be used by others). SEE ALSO
GSMarkupLocalizableStrings.app(1), Renaissance(7) GNUstep February 6, 2004 GSMARKUPBROWSER.APP(1)
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