For Linux:

Login to any node on Infocale using putty or any ssh tool.

Run the commands below :

[root@drserver201 ~]# cd /opt/VRTS/install

[root@drserver201 install]# ./installer -version >>>> this is interactive script

Enter the system names separated by spaces for version checking: (drserver201 )  <<< here input will be required hit enter so it will take default name

Sample Output :

 Checking communication on drserver201 ............................. Done
    Checking installed products on drserver201 ........................ Done

Platform of drserver201:
        Linux RHEL 7.5 x86_64   >>>>>>> This is OS version 

Installed product(s) on drserver201:
        InfoScale Enterprise - 7.4.1 - Licensed   >>>>> Infoscale Version and type of license.

Product:
        InfoScale Enterprise - 7.4.1 - Licensed >>>>>  Infoscale Version and type of license.

Packages:
        Installed Required packages for InfoScale Enterprise 7.4.1:
          #PACKAGE     #VERSION
          VRTSamf      7.4.1.0000
          VRTSaslapm   7.4.1.0000
          VRTScavf     7.4.1.0000
          VRTScps      7.4.1.0000
          VRTSdbac     7.4.1.0000
          VRTSdbed     7.4.1.0000
          VRTSfsadv    7.4.1.0000
          VRTSgab      7.4.1.0000
          VRTSglm      7.4.1.0000
          VRTSgms      7.4.1.0000
          VRTSllt      7.4.1.0000
          VRTSodm      7.4.1.0000
          VRTSperl     5.26.1.1
          VRTSpython   3.6.6.1
          VRTSsfcpi    7.4.1.0000
          VRTSsfmh     7.4.0.200
          VRTSspt      7.4.1.000
          VRTSvbs      7.4.1.0000
          VRTSvcs      7.4.1.0000                >>> Veritas Cluster Version 
          VRTSvcsag    7.4.1.0000
          VRTSvcsea    7.4.1.0000
          VRTSvcswiz   7.4.1.0000
          VRTSveki     7.4.1.0000
          VRTSvlic     4.01.74.002
          VRTSvxfen    7.4.1.0000
          VRTSvxfs     7.4.1.0000
          VRTSvxvm     7.4.1.0000    

Summary:

Packages:
        27 of 27 required InfoScale Enterprise 7.4.1 packages installed

Installed Patches for InfoScale Enterprise 7.4.1:
        None     >>> Patches if any installed 

Would you like to view Available Upgrade Options? [y,n,q] (y) n    >>> input needed
Do you want to version check additional systems? [y,n,q] (y) n      >>> input needed

An alternate approach is to verify using command line, depending on the OS (Unix/Linux)

1) In RHEL (Linux ) and SUSE Linux

rpm -qa | grep -i vrts

For example: If the command returns the below output, it confirms the Infoscale version as 7.2 

VRTSspt-7.2.0.000-RHEL7.noarch

VRTSvcsag-7.2.0.000-RHEL7.x86_64

VRTScavf-7.2.0.000-RHEL7.x86_64

VRTSveki-7.2.0.100-RHEL7.x86_64

VRTSllt-7.2.0.500-RHEL7.x86_64

VRTSglm-7.2.0.200-RHEL7.x86_64

VRTSsfmh-7.2.0.0-0.x86_64

VRTSvlic-3.02.71.004-RHEL6.x86_64

VRTSfsadv-7.2.0.000-RHEL7.x86_64

VRTScps-7.2.0.000-RHEL7.x86_64

VRTSvcsea-7.2.0.000-RHEL7.x86_64

VRTSvxvm-7.2.0.400-RHEL7.x86_64

VRTSvxfs-7.2.0.300-RHEL7.x86_64

VRTSgab-7.2.0.300-RHEL7.x86_64

VRTSamf-7.2.0.300-RHEL7.x86_64

VRTSgms-7.2.0.200-RHEL7.x86_64

VRTSdbac-7.2.0.300-RHEL7.x86_64

VRTSvbs-7.2.0.000-GA_Linux.x86_64

VRTSvcswiz-7.2.0.000-RHEL7.x86_64

VRTSperl-5.24.0.0-RHEL7.x86_64

VRTSvcs-7.2.0.000-RHEL7.x86_64

VRTSdbed-7.2.0.000-RHEL.x86_64

VRTSaslapm-7.2.0.510-RHEL7.x86_64

VRTSvxfen-7.2.0.400-RHEL7.x86_64

VRTSodm-7.2.0.300-RHEL7.x86_64

VRTSsfcpi-7.2.0.000-GENERIC.noarch

2) For Solaris

modinfo | grep -i vx  or pkginfo -l | grep -i VRTS

3) For AIX

lslpp -l | grep -i vx

4) For HP UNIX

swlist | grep -i vx

This article is to understand how to find Infoscale Version using the command line on Unix/Linux Platform