[SOLVED] Remove all lines, where (length <= 10 AND digitsOnly ) OR (length <= 8 AND lowerCaseLetters only)

Issue

I would like to know a bash command that removes all lines from a file for which one of the following is true: - only digits AND equal to or shorter than 10 characters - only lowercase letters (a-z, no special ones like umlaut) AND equal to or shorter than 8 characters

I figured out that sed is the right tool for this, but I can't get the right syntax together.

Solution

Use grep:

grep -vE '^[[:digit]]{1,10}$|^[[:lower:]]{1,8}$' file

Or sed with same regexes:

sed -E '/^[[:digit:]]{1,10}$/d;/^[[:lower:]]{1,8}$/d' file

Answered By - codeforester