AWK
$ ls -l
$ ls l | awk '{s+=$5} END{print s}'
$ ls -l
- drwxrxrx 3 lande gl 2048 Dec 12 19:21 bin
- drwx2 lande gl 4096 Nov 20 15:59 mail ...
Ex. $ ls l | awk '$6=="Dec"&&$7=="12"{print $0}' ? Print only files
- Sum total memory
$ ls l | awk '{s+=$5} END{print s}'
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