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Assuming that the filenames do not contain spaces, tabs or newlines, using one-liner and bash and awk would be simple:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }' | xargs -l mv

The xargs -l command execute mv for each line. Before executing command execute the following command and check that target and source file names are correct:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }'

should output something like:

melon.foo object001.foo
cookie.foo object002.foo
pie.foo object003.foo
apple.foo object004.foo

Assuming that the filenames do not contain spaces, tabs or newlines, using one-liner and bash and awk would be simple:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }' | xargs -L 1 mv

The xargs -l command execute mv for each line. Before executing command execute the following command and check that target and source file names are correct:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }'

should output something like:

melon.foo object001.foo
cookie.foo object002.foo
pie.foo object003.foo
apple.foo object004.foo

Using one-liner and bash and awk would be simple:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }' | xargs -l mv

The xargs -l command execute mv for each line. Before executing command execute the following command and check that target and source file names are correct:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }'

should output something like:

melon.foo object001.foo
cookie.foo object002.foo
pie.foo object003.foo
apple.foo object004.foo

Assuming that the filenames do not contain spaces, tabs or newlines, using one-liner and bash and awk would be simple:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }' | xargs -l mv

The xargs -l command execute mv for each line. Before executing command execute the following command and check that target and source file names are correct:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }'

should output something like:

melon.foo object001.foo
cookie.foo object002.foo
pie.foo object003.foo
apple.foo object004.foo

Using one-liner and bash and awk would be simple:

ls -rt | awk -F "." '{print  $1"."$2" object"  sprintf("%03d",NR)   "." $2 }' | xargs -l mv

The xargs -l command execute mv for each line. Before executing command execute the following command and check that target and source file names are correct:

ls -rt | awk -F "." '{print  $1"."$2" object" sprintf("%03d",NR) "." $2 }'

should output something like:

melon.foo object001.foo
cookie.foo object002.foo
pie.foo object003.foo
apple.foo object004.foo

Using one-liner and bash and awk would be simple:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }' | xargs -l mv

The xargs -l command execute mv for each line. Before executing command execute the following command and check that target and source file names are correct:

ls -rt | awk -F "." '{print  $0 " object" sprintf("%03d",NR)  "." $NF }'

should output something like:

melon.foo object001.foo
cookie.foo object002.foo
pie.foo object003.foo
apple.foo object004.foo