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Hi, awk is not a shell, so it complains about hdiutil...

execute the awk command alone. and store the result ( "OK" or "NOT OK" ) in a variable.

Then use if condition to check the variable value and do the installation

Command Line Mac: Installing a .dmg application from the command line (http://commandlinemac.blogspot.com/2008/12/installing-dmg-application-from-command.html)
...

try this

give the new version # in the highlighted part


nawk -v new="3.1.0.4890" -F"[<>]" '/CFBundleVersion/ {getline;current=$3;exit}END{if(new>current){print "NOT OK"}else{print "OK"}}'...

variable_sto_store=`awk -F"[<>]" '/CFBundleVersion/ {getline;print $3;exit}' input.xml`

If you want to capture it outside.

$ awk -F"[<>]" '/CFBundleVersion/ {getline;print $3;exit}' input.xml
3.1.0.4880