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hi guys
plz plz help me in this query in Redhat Linux
in the /etc/passwd file
i need to find the rows where column 5 is empty
using only grep
there is a pattern in all lines where column 5 is empty: the first column in all of them is either letters or numbers, the second is always x, the third is numebrs and the fourth is numbers
plz help me guys and ASAP
thanks a lot
First of all, please spell out your words, text speak is not appreciated on LQ forums. Besides that this sound a lot like homework and although it's not against the LQ Rules to ask for help with homework, you shouldn't post it verbatim nor should you expect us to do the work for you. We'll be glad to point you in the right direction if you show us what you've already figured out and where it's failing. And as a last point, don't ask for privileged attention, it's only urgent to you, not to us who are all volunteers here.
A good starting point is Google and the man page for grep
Code:
man grep
Looking forward to your participation in the forums. Have fun with Linux.
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Not that "blank" is actually a character class, but ...
[:blank:] is indeed a character class. It consists of <space> and <tab> only, as opposed to [:space:], which contains <space>, <tab>, <newline>, <vertical tab>, <form feed>, and <carriage return>.
The best description I've found of all the character classes is in the grep info page.
[:blank:] is indeed a character class. It consists of <space> and <tab> only, as opposed to [:space:], which contains <space>, <tab>, <newline>, <vertical tab>, <form feed>, and <carriage return>.
The best description I've found of all the character classes is in the grep info page.
Far out :}
Don't you hate it when man & info are out of sync like that?
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