Best way to check if a CSV file contains only zeros (separated by comma)-CodePudding

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Best way to check if a CSV file contains only zeros (separated by comma)

Time：01-14

I want to quickly identify files of this form (shape of the "matrix" can change)

0,0,0,0,0
0,0,0,0,0
0,0,0,0,0
0,0,0,0,0

What is the simplest way of doing it?

CodePudding user response：

Try to match any character other than 0 or , with [^0,]. If that fails, the file only contains zeroes.

if ! grep -q '[^0,]' filename.csv
then
    echo file is all zeroes
fi

CodePudding user response：

You can do

grep -v [0,]*

That will show any lines that don't match the expression.