Grep will recurse through any directories you match with your glob pattern. (In your case, you probably do not have any directories that match the pattern “*.cpp”) You could explicitly specify them: grep -ir “xyz” *.cpp */*.cpp */*/*.cpp */*/*/*.cpp, etc. You can also use the –include option (see the example below) If you are using … Read more
ack is peculiar in that it doesn’t have a blacklist of file types to ignore, but rather a whitelist of file types that it will search in. To quote from the man page: With no file selections, ack-grep only searches files of types that it recognizes. If you have a file called foo.wango, and ack-grep … Read more
Gnu grep v2.11-8 and on if invoked with -r excludes symlinks not specified on the command line and includes them when invoked with -R.
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
Use -f with a single dash to denote the standard input: $ echo Content | grep -f – notice.html <meta http-equiv=”Content-Type” content=”text/html; charset=ISO-8859-1″> … Note: This has been tested with GNU grep – I am not sure if it’s specified by POSIX.
“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
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