UNIX for Dummies Questions & Answers

How would I do the following :
I have this chemistry database. On the attachment. But I am not sure how to use grep to find a header, all know it to find patterns.

What have you tried so far and what is your expected output?

Are you simply wishing to grep and display all the records containing those key words?

I did

Code:

grep -wnv atom connect ter 4hkd.txt

to display the I guess part of the text without atom, connect,ter these words. But now I have to make it into header somehow.

Is this a homework assignment? This is the wrong forum for homework assignments.

Have you looked at your input file? Do you see any lowercase letters in your input file?
Do you see any occurrences of CONNECT or connect in your input file?

Your command:

Code:

grep -wnv atom connect ter 4hkd.txt

is looking for the string atom (in lowercase) and printing every line that does not contain a word that matches that string (preceded by its line number) from the files connect, ter, and 4hkd.txt.

I suggest you issue

Code:

man grep

at the commandline and read what comes up there. This is generally a good idea, btw.: whenever you want to know how too use a command, issue man command to get the manual entry about command.

I suggest you pay special attention to the "-v" switch of grep.

I hope this helps.

bakunin