using grep after curl allows you to search for specific things like hyperlinks and other parts of a page.

you can add grep after another utility to filter its output.

all grep options

several search tips with grep in shell.

It should be easier to use awk over bash, especiallly for AND conditions.

For example, for "line containing cake but not at": * grep: grep 'cake' table.txt | grep -v 'at' * grep with PCRE: grep -P '^(?!.*at).*cake' table.txt * awk: awk '/cake/ && !/at/' table.txt