Shell Programming and Scripting

$ awk '/core$/{print $2":"$1;exit}'

$ awk '/([[:digit:]]+[[:space:]])core([[:space:]]+$|$)/{print $2":"$1}' <<EOF
10 cores
2 cores
y cores
a core
1 core
10 cores
10 core abc
EOF

core:1

$ awk '/([[:digit:]]+[[:space:]])core([[:space:]]+$|$)/{print $2":"$1}'

$ awk '/([[:digit:]]+[[:space:]])(core|cores)([[:space:]]+$|$)/{print $2":"$1}' <<EOF
10 cores
2 cores
y cores
a core
1 core 
10 cores
10 core abc
EOF

cores:10
cores:2
core:1
cores:10

$ cat file
System Hardware
    Model:              ia64 hp Integrity Virtual Partition
    Main Memory:        6137 MB
    Processors:         2
        Intel(R)  Itanium(R)  Processor 9560 (2.53 GHz, 32 MB)
        8 cores, 16 logical processors per socket
        6.38 GT/s QPI, CPU version D0
               Active processor count:
               1 socket
               1 core
               2 logical processors (2 per socket)
               LCPU attribute is enabled 
 
$ awk '/([[:digit:]]+[[:space:]])(core|cores)([[:space:]]+$|$|,)/{gsub(/,/,x);print $2":"$1}' file
cores:8
core:1

 
print_manifest | awk '/([[:digit:]]+[[:space:]])(logical processors)([[:space:]]+$|$|,)/{gsub(/,/,x);print $2":"$1}'