Hi Ksn,
You need to check your permisions to execute the file.
Type:
ls -la /opt/IBM/WebSphere/AppServer/profiles/profile_(node, dmgr, appsrvr)/isadc.sh
And check the owner and group of the file
rwxr-xr-x OWNER GROUP isadc.sh
You need x (execute) rights in OWNER or GROUP
if you haven't change it. To change the permision (basically) you need to be OWNER or superuser like root.
chmod 750 /opt/IBM/WebSphere/AppServer/profiles/profile_(node, dmgr, appsrvr)/isadc.sh
Hope this helps,
Kind regards