UNIX for Dummies Questions & Answers

Just wondering...
What key stoke do you use to get the pipe?
Ctrl-1 or Alt GR-7

My mitake instead of grep use egrep

egrep -f test1 test2
angie blond
mary brunnet
susan red


I am getting the requird result.

---------- Post updated at 10:17 AM ---------- Previous update was at 10:15 AM ----------

Hi, instead of grep you have to use egrep

egrep -f test1 test2
angie blond
mary brunnet
susan red

I am getting the required result

When i type this

Code:

while read line file1.txt; do echo -e "$line";done

it does not work
when i type this

Code:

cat file1.txt|while read line; do echo -e "$line";done

it does work.

Could this be helpful?

For the other part, you mean to rename the files to uppercase letters?

---------- Post updated at 10:33 AM ---------- Previous update was at 10:31 AM ----------

Neither the egrep works

---------- Post updated at 10:33 AM ---------- Previous update was at 10:33 AM ----------

Sorry, i did not understand what you mean...

Yes first example does not work because its a non sence...
read command reads something, a VAR a line from input ( and so cant read a file, but cat does...)
I mean by uppercase e.g.

Code:

cat file1.txt|while read LINE; do echo -e "$LINE";done

Addendum...
I ment depending from where you come from and what keyboard layout you have, you may not choose the correct one... For the only reason I saw at that time for the line to not work was the | (for me here it would be AltGr+ 7 keys to depress)

You can definitely read a line from a file in a while loop:

Code:

while read LINE
do
        echo -e "$LINE"
done < file1.txt

This will also prevent side-effects like variables being set inside the loop not being seen outside it.

Corona688:
You are absolutely right but that, our member already knows and tried ( see the beginning of thread...and I also sugggested was better...) but what he could not understand what was incorrect in his example giving a

Code:

read VAR <a file>

Maybe could you explain to our guest the reason or how works the redirection ( I wonder if its not there the confusion - where in input using < you specify a file, but doesnt work with read <variable> file...)

It may sound silly but, since i want to use grep i actually want two input files, file1.txt and file2.txt

How do I do this? I mean in my case the command

Code:

cat file1.txt|while read line; do grep "$line" file2.txt;done

does not give me result. When i use the < though to set the input file it works.
So i wonder how can i do this with my two input files?
I hope i am not very confusing but i have no idea why WITH THE PARTICULAR FILES it does not work