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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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KRB5-CONFIG(1)						      General Commands Manual						    KRB5-CONFIG(1)

NAME
krb5-config - tool for linking against MIT Kerberos libraries SYNOPSIS
krb5-config [ --help | --all | --version | --vendor | --prefix | --exec-prefix | --cflags | --libs libraries ] DESCRIPTION
krb5-config tells the application programmer what special flags to use to compile and link programs against the installed Kerberos libraries. OPTIONS
--help print usage message. This is the default. --all prints version, vendor, prefix and exec-prefix. --version prints the version of the installed Kerberos implementation. --vendor prints the vendor of the installed Kerberos implementation. --prefix prints the prefix with which Kerberos was built. --exec-prefix prints the exec-prefix with which Kerberos was built. --cflags prints the compiler flags with which Kerberos was built. --libs libraries list compiler options required to link with libraries. Possible values for libraries are: krb5 Kerberos 5 application gssapi GSSAPI application with Kerberos 5 bindings kadm-client Kadmin client kadm-server Kadmin server kdb Application that accesses the kerberos database SEE ALSO
kerberos(1), cc(1) KRB5-CONFIG(1)
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