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How to select line by line in shell

 
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# 1  
Old 10-11-2006
How to select line by line in shell
Hi,
This is what the file data.lst contains.


aaaaaaaa eeeeeeeeeeeeeeee 4444444 rrrrrrrrrrrrr tttttttttttt
bbbbbbbb eeeeeeeeeeeeeeee 7777777 uuuuuuuu eeeeeeeee
qqqqqqqq gggggggggggggggg 6666666 oooooooo ppppppppp
Here I want to cut the third field and put it in a new file
I tried this way

echo
for i in `cat data.lst`
do
echo $i | cut -c 30-37 >> newfile.lst
done


But this doesn't work.Can someone help me.
Thanks in advance
Last edited by preethgideon; 10-11-2006 at 07:28 PM..
# 2  
Old 10-11-2006
You need a space ie cut -c 30-37

Also try cat data.lst | awk '{print $3}' > /tmp/newfile
# 3  
Old 10-11-2006
Hey Andrek,
The awk worked.I did't get the first one.Anyways thank you very much.

Have a great day.Bye
# 4  
Old 10-11-2006
Hi Andrek,
I have another problem.
I have have a similar file this way


aaaaaaaa eeeeeeeeeeeeeeee 4444R16 rrrrrrrrrrrrr tttttttttttt
bbbbbbbb eeeeeeeeeeeeeeee 7777777 uuuuuuuu eeeeeeeee
qqqqqqqq gggggggggggggggg 6666R16 oooooooo ppppppppp
In some lines last 3 digits of the third field ends with R16.If it ends with R16 then concatinate to a new file else proceed.

Help !!
# 5  
Old 10-11-2006
Python alternative:
Code:
o = open("output","a")
for line in open("input.txt"):
	line = line.strip().split()
	if line[2].endswith("R16"):
		print >>o, ' '.join(line)
o.close()

Output:
/home> python test.py
aaaaaaaa eeeeeeeeeeeeeeee 4444R16 rrrrrrrrrrrrr tttttttttttt
qqqqqqqq gggggggggggggggg 6666R16 oooooooo ppppppppp
# 6  
Old 10-11-2006
I am using vi.Will I be able to use this code ?

Its giving the error for sysntax.
# 7  
Old 10-11-2006
Quote:
Originally Posted by preethgideon
Hi,
This is what the file data.lst contains.


aaaaaaaa eeeeeeeeeeeeeeee 4444444 rrrrrrrrrrrrr tttttttttttt
bbbbbbbb eeeeeeeeeeeeeeee 7777777 uuuuuuuu eeeeeeeee
qqqqqqqq gggggggggggggggg 6666666 oooooooo ppppppppp
Here I want to cut the third field and put it in a new file
I tried this way

echo
for i in `cat data.lst`
do
echo $i | cut -c 30-37 >> newfile.lst
done


But this doesn't work.Can someone help me.
Thanks in advance
Code:
cut -d" " -f3 data.lst > newfile.lst

 
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