I don't understand some basics..

Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
Homework and Emergencies Homework & Coursework Questions I don't understand some basics..
# 1  
I don't understand some basics..

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

1. The problem statement, all variables and given/known data:
1)find all lines in file ,myf that contain all the words cat dog and mouse in any order and start with the letter A
2) list all fines in home dir that contain string "so " somewhere within them. next just list number of files in home dir that contain string so

2. Relevant commands, code, scripts, algorithms:
find
ls

3. The attempts at a solution (include all code and scripts):
#1) egrep "cat|dog|mouse" myf -> would give all lines containing either cat dog or mouse , however i don't know how to start it with the letter A
for #2) find . -name "so" ( however i now this is very off)
thank you for the help


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

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
# 2  
For the first question (as long you you have posted the question correctly), bear in mind that all the conditions must be statisfied.

The line must start with the letter "A".
The lne must contain the string "cat".
The line must contain the string "dog".
The line must contain the string "mouse".

One way is to progressively eliminate with "grep":
Code:
grep \^"A" myf | grep "cat" | grep "dog" | grep "mouse"

The egrep in your post will do an "or" not an "and".


For the second question, take a look at "grep -l" and for the second part of the question "wc -l".
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #991
Difficulty: Medium
System V was known inside Bell Labs as Unix 6.0.
True or False?

8 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Don't understand AWK asort behaviour

Hello, I have the following script : BEGIN { print "1 ***"; split("abc",T,""); T="e"; T="z"; T="y"; for (i in T) printf("%i:%s ",i,T); print ""; for (i=1; i<=length(T); i++) printf(T); print "" print "2 ***"; asort(T,U); for (i in U) printf("%i:%s ",i,U); ... (3 Replies)
Discussion started by: jgilot
3 Replies

2. UNIX for Dummies Questions & Answers

I don't understand conditions :(

Hi there, I have a very general question. I'm rather new to (bash) shell scripting and I don't understand how conditions work... I've read numerous tutorials but I don't get it. I really don't. Sometime what I do works, sometime it doesn't and that's frustating. So what's the actual difference... (0 Replies)
Discussion started by: hypsis
0 Replies

3. UNIX for Dummies Questions & Answers

trying to compile and don't understand error message

this is my program i am trying to compile /* filedata -- display information about a file */ #include <stdlib.h> #include <stdio.h> #include <sys/stat.h> #include <sys/types.h> /* * use octarray for determing * if permission bits set */ static short octarray = {0400, 0200, 0100,... (2 Replies)
Discussion started by: heywoodfloyd
2 Replies

4. Shell Programming and Scripting

Perl syntax that I don't understand.

I'm just trying to confirm that I understand someone's code correctly. If someone has code that says: $foo ||= mysub(); I'm assuming that it means if $foo is nothing or undef, then assign it some value via mysub(). If I'm wrong on this, please let me know. Also, what's the difference... (4 Replies)
Discussion started by: mrwatkin
4 Replies

5. UNIX for Dummies Questions & Answers

Another Simple BASH command I don't understand. Help?

I have a text file called file1 which contains the text: "ls -l" When I enter this command: bash < file1 > file1 file1 gets erased. However if I enter this command: bash < file1 > newfile the output from "ls -l" is stored in newfile. My question is why doesn't file1's text ("ls -l") get... (3 Replies)
Discussion started by: phunkypants
3 Replies

6. Shell Programming and Scripting

Don't understand how RS functions in awk

I learn using RS in awk to extract portion of file in this forum which is wonderful solution to the problem. However, I don't understand how exactly it operates. I don't quite understand the mechanism behind how searching for /DATA2/ can result in extracting the whole section under "DATA2" ... (3 Replies)
Discussion started by: joe228
3 Replies

7. Solaris

I don`t understand how It work (about startup script)?

Hi all. The startup script in /usr/local/bin. After user login the script run an application. Iwould in the same way run the another application. How to make It similar? Where I must to look? Regards. (3 Replies)
Discussion started by: wolfgang
3 Replies

8. UNIX for Advanced & Expert Users

don't understand the unix script

if {"$my_ext_type" = MAIN]; then cd $v_sc_dir Filex.SH $v_so_dir\/$v_fr_file Can somebody tell me what does this suggest. I am pretty new to unix and I am getting confused. What i understood from here is If we have a file extension name as MAIN which we have then we change the directory to... (1 Reply)
Discussion started by: pochaman
1 Replies

Featured Tech Videos