Bash: grep: A couple of usefull applications

 στο Bash / GNU/Linux / HowTos  επισημασμένο με ετικέτα bash / delete / extract / GNU/Linux / grep / howtos Από

(How) to delete all empty lines from a file:

cat someFile | grep -v '^$'

(How) to get all numbers that have no sign in front of them (all positive numbers, from a file where on each line there is one number only):

cat someFile | grep ^[0-9]

(How) to extract all negative numbers (from a file where on each line there is one number only):
You can of course replace the minus ‘-‘ character with any other you want to use as a starting character for a line.

cat someFile | grep ^-

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