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Old 12-06-2003, 04:08 PM   #1
1rulesall
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How do I select a row of info in a database file?


Help me if you can.

I am just learning Linux, using Bash. I have a small program that uses a menu to add, delete, search, and find players on a team roster. The roster list of players (database) is made of 6 fields, separated by colons. For example:

Entry#:Last Name:First Name:Position:Year:Phone Number

My problem is when my script runs to search for a player, which searches by entry #, there are sometimes multiple players listed.

The search script uses a grep command, and finds numbers in the entry # column and the phone # column.

Can I limit a grep command to search just the first column?

Thanks,

1rulesall!
 
Old 12-06-2003, 05:08 PM   #2
slakmagik
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Look into 'cut' - then pipe that to grep. Though I'm sure there's a million ways to do it and you'll get several suggestions and at least one person will tell you to write in perl.
 
Old 12-06-2003, 05:15 PM   #3
h/w
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use perl!
 
Old 12-06-2003, 05:17 PM   #4
h/w
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i was kidding. i have never used perl, and not had enough interest in it either.
 
Old 12-06-2003, 10:23 PM   #5
1rulesall
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Ok,
thanks digiot for replying.
But how do I cut the fifth row and only the fifth row of a roster list that's about 30 rows long
 
Old 12-07-2003, 01:02 AM   #6
slakmagik
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Did you check the man page? It'd be something like 'cut -d: -f5 | grep thing-I-want-to-find'

Oh. Oops. Row? Or column? Cut will chop a column from a line and grep will 'cut' a line from a list, so to speak. Come to think of it, cut's no good if you're wanting to extract the whole line. I don't really know regular expressions but, if the problem is that you have numbers at the beginning (numbering entries) and numbers at the end (phone numbers) and 'grep 5' gives you row 5 *and* everybody whose phone number has a five in it, then 'grep ^5' will do it. That basically means 'lines beginning with 5'. That's only useful for that specific, and I don't know that that's your complete situation, but you can do far more complicated stuff with those principles, anyway.
 
Old 12-08-2003, 09:27 PM   #7
1rulesall
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Thanks for the help

Thanks digiot,

That's exactly the situation I was looking for. Much appreciated. I will go try it.

Thanks again,

1rulesall.
 
  


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