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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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GST-CONVERT(1)							   User Commands						    GST-CONVERT(1)

NAME
gst-convert - Smalltalk syntax converter and beautifier DESCRIPTION
Usage: gst-convert [OPTION]... [INFILE [OUTFILE]] gst-convert [OPTION]... -o|--output OUTFILE INFILES OPTIONS
-q, --quiet don't show any message -v, --verbose print extra information while processing -f, --format=FORMAT convert from given input format (supported formats are gst, gst2, sif, squeak) -F, --output-format=FORMAT convert to given output format (supported formats are gst, gst2, squeak) -C, --class=REGEX convert only classes matching REGEX -C, --class=+REGEX in addition, convert classes matching REGEX -C, --class=-REGEX do not convert classes matching REGEX -c, --category=REGEX convert only classes whose category matches REGEX -c, --category=+REGEX in addition, convert those whose category matches REGEX -c, --category=-REGEX do not convert classes whose category matches REGEX -r, --rule='CODE->REPL' look for CODE and replace it with REPL -o, --output OUTFILE concatenate multiple input files into a single converted output file --help display this message and exit --version print version information and exit SEE ALSO
The full documentation for gst-convert is maintained as a Texinfo manual. If the info and gst-convert programs are properly installed at your site, the command info gst should give you access to the complete manual. gst-convert version 3.2.4 December 2011 GST-CONVERT(1)
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