“Non-capturing” doesn’t mean that the group isn’t part of the match; it means that the group’s value isn’t saved for use in back-references. What you are looking for is a look-behind zero-width assertion: grep -Po “(?<=syntaxHighlighterConfig\.)[a-zA-Z]+Color” file
grep file foo | while read line ; do echo “$line” | date %s.%N ; done More readably in a script: grep file foo | while read line do echo “$line” | date %s.%N done For each line of input, read will put the value into the variable $line, and the while statement will execute … Read more
The problem is that by default, you need to escape your |’s to get proper alternation. That is, grep interprets “foo|bar” as matching the literal string “foo|bar” only, whereas the pattern “foo\|bar” (with an escaped |) matches either “foo” or “bar”. To change this behavior, use the -E flag: tail -f logFile | grep -vE … Read more
The absolute last thing I want to do is download and parse all of the content myself (i.e. create my own spider). Once I learned that Wget writes to stderr by default, I was able to redirect it to stdout and filter the output appropriately. wget –spider –force-html -r -l2 $url 2>&1 \ | grep … Read more
find . -name ‘*car*’ -exec rm -f {} \; or pass the output of your pipeline to xargs: find | grep car | xargs rm -f Note that these are very blunt tools, and you are likely to remove files that you did not intend to remove. Also, no effort is made here to deal … Read more
The tricky part is a regex that includes a dash as one of the valid characters in a character class. The dash has to come immediately after the start for a (normal) character class and immediately after the caret for a negated character class. If you need a close square bracket too, then you need … Read more
I do this: grep … | grep -v — “^–$” But this works too (on many, not all OS’es)! grep –no-group-separator … And it doesn’t spit out that “–” or even a blank line.
It depends. If you use regular grep, you don’t escape: echo ‘(foo)’ | grep ‘(fo*)’ You actually have to escape if you want to use the parentheses as grouping. If you use extended regular expressions, you do escape: echo ‘(foo)’ | grep -E ‘\(fo*\)’
You need to use the option -f: $ grep -f A B The option -F does a fixed string search where as -f is for specifying a file of patterns. You may want both if the file only contains fixed strings and not regexps. $ grep -Ff A B You may also want the -w … Read more
Please refer to the solution at the end of this post as a better alternative to what you’re doing. You can explicitly include hidden files (a directory is also a file). grep -r search * .[^.]* The * will match all files except hidden ones and .[^.]* will match only hidden files without … However … Read more