[SOLVED] Read Each Line of a File as Input

roololing · 06-21-2011, 08:20 PM

I'm writing a program which now accepts user input:

Code:

echo "Enter a date in the format YYYY MM DD hh mm ss."
read gregyr gregmo gregdy greghr gregmn gregsc

This lets the user input a date and time, such as 2011 06 21 15 12 45, and have each number assigned to their corresponding variable. Later in the program, these variables are put into an equation, and then the terminal spits out the answer.
Now I have to have the program read all of the lines from a text file, which is in this format, assign the variables, solve the equations, and put the solutions into a new file. I haven't been using bash for very long; any help would be appreciated.

tuxdev · 06-21-2011, 08:27 PM

Use a standard while read loop:
http://mywiki.wooledge.org/BashFAQ/001

Tinkster · 06-21-2011, 08:28 PM

Something like this:

Code:

while read gregyr gregmo gregdy greghr gregmn gregsc; 
do
   #<your magic goes here>
done <infile

Cheers,
Tink

roololing · 06-21-2011, 08:36 PM

Quote:

Originally Posted by Tinkster

Something like this:

Code:

while read gregyr gregmo gregdy greghr gregmn gregsc; 
do
   #<your magic goes here>
done <infile

Cheers,
Tink

Thanks.

The program just repeatedly tells me that the Entry is invalid, which means that whatever it's getting isn't in the correct format...

roololing · 06-21-2011, 09:44 PM

OH.
I think the program is reading the newline as part of gregsc....
Is this fixable without having to put spaces after the thousands of lines in this file?

Tinkster · 06-21-2011, 10:08 PM

I'm not sure what your actual file format is, if it's a matter of
DOS vs Linux line endings, just use fromdos or dos2unix; if they're
not available, tr or sed could easily help....

Cheers,
Tink

roololing · 06-22-2011, 03:15 PM

Okay I just did some find/replace magic and made spaces after every line, and those go into a junk variable.

Code:

while read gregyr gregmo gregdy greghr gregmn gregsc whatevz;
do
        #boopboopdeboopdoop
done < infile > outfile

So I'm finished! Thank you so much!

Tinkster · 06-22-2011, 03:33 PM

Nice :}

Glad you got it going!

Cheers,
Tink