How to change the path location within the shell script?

bealefay · 02-05-2020, 04:33 AM

I am trying to find the installed tomcat version and location of the server.xml file to get the tomcat port number.
Using below script to do that.

Code:

#!/usr/bin/env bash

var1=$(find / -name "version.sh" ! -size 0 2>&1 |egrep -v "tmp|docker")

for loc1 in $var1
do
    abc=$(echo "$loc1" | rev | cut -c 11- | rev)
    tomcat_version=$(cd "$abc";./version.sh | grep "Server number:" | awk '{print $3}')
    tomcat_status=`tomcat`

    if [ "$tomcat_version" != "" ];then
    echo $tomcat_version
     echo "$abc"
     

    break
    fi
done

but in order to get the port number i want to change from tomcat/bin to tomcat/conf location.
For that i tried to use below synatx but it's not working.

echo "$(cd "$abc";../..)"

Can someone please suggest how to change the path ?

Turbocapitalist · 02-05-2020, 04:58 AM

I'm not sure if I read it correctly but I think a lot of that could be offloaded on to the find utility.

Code:

#!/bin/sh

find ./ \
        -path '*docker*' -prune -o \
        -path '*tmp*' -prune -o \
        -name 'version.sh' \
        -execdir ./tomcat \; \
        -execdir awk '/Server number:/{print $3}' {} \; 

exit 0

boughtonp · 02-05-2020, 07:36 AM

Quote:

Originally Posted by bealefay

I am trying to find the installed tomcat version and location of the server.xml file to get the tomcat port number.
Using below script to do that.

Why?

What is the overall problem you are trying to solve?

If you're looking for "the" installed Tomcat, then what makes you think the port isn't the default?

What happens when there's more than one Tomcat installed and your command picks the wrong one first?

rtmistler · 02-05-2020, 07:51 AM

Welcome to LQ.

Quote:

Originally Posted by bealefay

Can someone please suggest how to change the path ?

"cd <path>" - in your script.

However you may not need to do this.

Quote:

Originally Posted by bealefay

I am trying to find the installed tomcat version and location of the server.xml file to get the tomcat port number.

The whole locating of version.sh may be a loaded problem. Who's to say if there aren't several version.sh and six of the several are not related to Tomcat.

Perhaps you ought to find out the execution location for tomcat. I'm not familiar with running it, but whatever you would use to run it, you could use the "which" command to find out the path for it. You could next test that path to find out the existence, or not, of version.sh, and then you can run that script and parse the output. All of this you can do either by changing directory in your script, as shown above in my top statement how to change the path, or you can likely do that all without changing the path and just run version.sh using the fully qualified pathname for it.

As in the command line, you can run a program if you're in the directory for it, or you can run it using the path for it. And further, if the executable is in your actual $PATH environment variable, then you can run it anyways, without specifying the path. As always, I'd recommend what several may also say, to script defensively, using no assumptions, and just use the full paths as much as possible.

Edit additional:
And what executable (Tomcat) does not support command line arguments such as -v, --version, or similar? In short, why would you need the version.sh script. Or it is solely doing the command line switches? Review that script and figure out why it is anything special.

boughtonp · 02-05-2020, 08:26 AM

The Tomcat version.sh ultimately executes "{samedir}/catalina.sh version" (which itself puts together a java command to execute).

So a safer way to determine Tomcat version would be something like:

Code:

for f in $(find / -path '*tomcat*/bin/catalina.sh')
do
	"$f" version | awk '/Server number:/{print $3}'
done

That'll output all version numbers for Tomcat instances with the word tomcat in their path - that excludes (for example) instances within Atlassian products where the directory is named otherwise, but still can't guarantee that the desired instance is in a predictable position.

bealefay · 03-15-2020, 10:15 PM

Forgot to thank.
Thank you all for your feedback and help.

pan64 · 03-16-2020, 12:41 AM

Quote:

Originally Posted by bealefay

Forgot to thank.
Thank you all for your feedback and help.

If you think your problem is solved please mark the thread solved. Also if you really want to say thanks just click on yes.

ondoho · 03-16-2020, 03:01 AM

And if you really really want to say thanks, give back to the community:
Tell us how you SOLVED it. Others will benefit.