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Homework and Emergencies Homework & Coursework Questions Grep line above X condition
# 1  
Old 04-27-2010
Grep line above X condition
1. The problem statement, all variables and given/known data:

I have to grep a data file called datebook.txt. The last information in each line is a salary. I have to grep all the lines which precede those lines with 6 figure salaries. I can't SID it, or use Perl. It has to be grep (or egrep or something with grep in it).

2. Relevant commands, code, scripts, algorithms:

Code:
Data: Steve Blenheim:238-923-7366:95 Latham Lane, Easton, PA 83755:11/12/56:20300
Betty Boop:245-836-8357:635 Cutesy Lane, Hollywood, CA 91464:6/23/23:14500
Igor Chevsky:385-375-8395:3567 Populus Place, Caldwell, NJ 23875:6/18/68:23400
Norma Corder:397-857-2735:74 Pine Street, Dearborn, MI 23874:3/28/45:245700
Jennifer Cowan:548-834-2348:583 Laurel Ave., Kingsville, TX 83745:10/1/35:58900
Jon DeLoach:408-253-3122:123 Park St., San Jose, CA 04086:7/25/53:85100
Karen Evich:284-758-2857:23 Edgecliff Place, Lincoln, NB 92743:7/25/53:85100
Karen Evich:284-758-2867:23 Edgecliff Place, Lincoln, NB 92743:11/3/35:58200
Karen Evich:284-758-2867:23 Edgecliff Place, Lincoln, NB 92743:11/3/35:58200
Fred Fardbarkle:674-843-1385:20 Parak Lane, Duluth, MN 23850:4/12/23:780900
Fred Fardbarkle:674-843-1385:20 Parak Lane, Duluth, MN 23850:4/12/23:780900
Lori Gortz:327-832-5728:3465 Mirlo Street, Peabody, MA 34756:10/2/65:35200
Paco Gutierrez:835-365-1284:454 Easy Street, Decatur, IL 75732:2/28/53:123500
Ephram Hardy:293-259-5395:235 CarltonLane, Joliet, IL 73858:8/12/20:56700
James Ikeda:834-938-8376:23445 Aster Ave., Allentown, NJ 83745:12/1/38:45000
Barbara Kertz:385-573-8326:832 Ponce Drive, Gary, IN 83756:12/1/46:268500
Lesley Kirstin:408-456-1234:4 Harvard Square, Boston, MA 02133:4/22/62:52600
William Kopf:846-836-2837:6937 Ware Road, Milton, PA 93756:9/21/46:43500
Sir Lancelot:837-835-8257:474 Camelot Boulevard, Bath, WY 28356:5/13/69:24500
Jesse Neal:408-233-8971:45 Rose Terrace, San Francisco, CA 92303:2/3/36:25000
Zippy Pinhead:834-823-8319:2356 Bizarro Ave., Farmount, IL 84357:1/1/67:89500
Arthur Putie:923-835-8745:23 Wimp Lane, Kensington, DL 38758:8/31/69:126000
Popeye Sailor:156-454-3322:945 Bluto Street, Anywhere, USA 29358:3/19/35:22350
Jose Santiago:385-898-8357:38 Fife Way, Abilene, TX 39673:1/5/58:95600
Tommy Savage:408-724-0140:1222 Oxbow Court, Sunnyvale, CA 94087:5/19/66:34200
Yukio Takeshida:387-827-1095:13 Uno Lane, Ashville, NC 23556:7/1/29:57000
Vinh Tranh:438-910-7449:8235 Maple Street, Wilmington, VM 29085:9/23/63:68900


3. The attempts at a solution (include all code and scripts):

I can currently get 5 of the 6 lines that are needed with this code.

Code:
egrep -B 1 ":[0-9]{6}" datebook.txt | egrep -v ":[0-9]{6}"

unfortunately when I do the second egrep, it deletes one of the figures which should be there. That's because there are two 6 figure salaries right next to each other (specifically Fred Fardbarkle). Which means that one of the lines above a 6 figure salary is itself a 6 figure salary, and that get's erased with the second grep.

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

Champlain College, Burlington VT, United States.
Professor: Jason McGoff
SWE-315-81
# 2  
Old 04-27-2010
why not with awk?
Code:
nawk -F\: '{if(length($NF) >= "6"){print $0}}' infile

or with grep maybe

Code:
grep ":[0-9][0-9][0-9][0-9][0-9][0-9]" infile
grep ":[0-9]\{6\}"

# 3  
Old 04-27-2010
I don't know, this is a chapter on grep, so everything has to be done with grep. we are getting to awk and sid in the next chapter. But remember, I don't need the lines with 6 figures, I need the lines above the lines with 6 figures. It's just that one of the lines above a line with 6 figures also has six figures, so in order to get only the lines above the lines with 6 figures, I can't just erase all the lines with 6 figures. There needs to be a way to print only the lines above the lines with 6 figures, and not the lines with 6 figures themselves (with the exception of the line with 6 figures above the other line with 6 figures).
# 4  
Old 04-28-2010
its no that easy to achive your requirement, but i can partially help you.

first of all to find Nth occurance of a pattern in a file use this one liner (N=4):

Code:
nawk -F\: -v occ="4" '$NF~/pattern/{i++} i==occ{print $0;exit}' infile

and to be able to get 1 line before (1 line above!) and 0 line after a pattern:

Code:
/usr/sfw/bin/ggrep "pattern" -A0 -B1 infile

using the above knowlende you can try to create a script for your aim.

regards
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