Once upon a time, Mike Wright <nobody@xxxxxxxxxxxxxxxxxxxx> said: > PATTERN="^.*http:\/\/.*\.in.*$" > grep $PATTERN < file.of.links >links.in Several issues I see: - it appears you are using a shell variable to pass the pattern; since you are using double quotes, shell interpolation occurs, so all the escaping \ characters are just escaping from the shell - grep just sees "^.*http://.*.in.*$"; - you'll match any URL with "in" in it anywhere, not just in the hostname portion - "^.*" and ".*$" are essentially useless, because they match anything at the start and end of the line respectively (which, since by default a pattern isn't anchored to the start/end, is not needed) - you don't need to escape the / (so // is fine instead of the "leaning toothpicks" of "\/\/") - if you are going to use a variable to set the pattern, you need to use double quotes around it when it is used - may not be a problem for your case, but you won't match HTTPS URLs - minor nit: grep reads from a file, so shell redirection is superfluous Putting all that together, I'd recommend: PATTERN='https?://[^/]*\.in/' grep "$PATTERN" file.of.links > links.in or just: grep 'https?://[^/]*\.in/' file.of.links > links.in Only potential oddity would be if you have URLs with non-standard ports specified (like "https://foo.in:8080/";); to match that, you could use egrep instead (extended regex): egrep 'https://[^/]*\.in(:[0-9]+)?/' file.of.links > links.in -- Chris Adams <linux@xxxxxxxxxxx> -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://lists.fedoraproject.org/admin/lists/users@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
