May 5, 2015 · The egrep command is a shortcut for the grep binary, but with one exception: when grep is invoked as egrep, the grep binary activates its internal logic to run as if it were called as grep -E. The difference is that -E option enables usage of extended regexp patterns.

Sep 28, 2012 · I need to use egrep to count words that contain strings which match a regular expression. For instance, I need to do something like "Count the number of words containing three consecutive vowels" (...

Sep 1, 2009 · Here you are sending the file names (output of the find command) as input to egrep; you actually want to run egrep on the contents of the files. Here are a couple of alternatives: find . -name "*.txt" -exec egrep mystring {} \; or even better. find . -name "*.txt" -print0 | xargs …

Jul 6, 2010 · egrep doesn't recognize \d shorthand for digit character class, so you need to use e.g. [0-9]. Moreover, while it's not absolutely necessary in this case, it's good habit to quote the regex to prevent misinterpretation by the shell. Thus, something like this should work: egrep '[0-9]{7}-[0-9]{10}' file See also. egrep mini tutorial; References

Oct 10, 2013 · The condition is evaluating egrep command for searching two patterns in the file. The condition should be true ($? = 0) only if both patterns are found in the file. else it should fail. But the actual egrep command is doing OR function between patterns and I want AND logic between patterns. Please help me.

Feb 13, 2012 · egrep -wi 'FRIENDS|FOES' *.sql This command is intended to scan each SQL file for the whole keywords ...

I know egrep has a very useful way of anding two expressions together by using: egrep "pattern1.*pattern2"|egrep "pattern2.*pattern1" filename.txt|wc -l However is there an easy way to use egrep's AND operator when searching for three expressions as the permutations increase exponentially as you add extra expressions.

Feb 24, 2014 · The easiest way to put these sorts of expressions together is with multiple pipes. There's no shame in that, particularly because a regular expression (using egrep) would be ungainly since you seem to imply you want order independence. So, in order, grep str1 | grep str2 | grep str3. egrep '(str1|str2|str3)' grep str1 | egrep '(str2|str3)'

Sep 10, 2012 · I'm trying to use egrep with a regex pattern to match whitespace. I've used RegEx with Perl and C# before and they both support the pattern \s to search for whitespace. egrep (or at least the version I'm using) does not seem to support this pattern. In a few articles online I've come across a shorthand [[:space:]], but this does not seem to work.

May 30, 2012 · I’m trying to validate input by using egrep and regex.Here is the line from script (c-shell): echo $1 ...