Shulou(Shulou.com)06/02 Report--

awk {} curly brackets inside is action, outside is condition

NR==(number record)

If you do not enter numbers, default to all rows

2. Select columns---If you want to separate columns, add ", or other symbols"

Display oldboy.txt row 4 column 1 column 2 and column 4 awk default space is a separator, so the fourth column after together, a character default is a knife, unless added +,[]+ into the whole

The case first specifies the separator as space and comma-F"[ ,]", one symbol is equivalent to one knife

Remove IP address

Compare sizes

NF is the last column.

Check disk usage Both numbers and percent signs are not recognized

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