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 Forum index » Off-Topic Area » Programming
How to read line by line and loop through elements in bash ?
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acampbe2

Joined: 11 Jun 2012
Posts: 2

PostPosted: Mon 11 Jun 2012, 22:51    Post subject:  How to read line by line and loop through elements in bash ?  

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I need help reading a txt file line by line, and then looping through each element in bash script. After hitting a element I need to cut the # of the column represented by the current numerical element, and then assign it to a file. In the end I need to paste all these files together. The columns are in a separate file. The first txt file reads as such

1,6,62,6

7,7,52,24

3,145,25,69

Then for example I need to cut column 5 in a separate file, and then assign to a new file. One the line is done the process starts again.This process would be easy in python or java, but I'm just very new to bash script.

This is a sample column:

1:45

1:56

1:56

1:69

ccData_t.nnv
while read line; do
cut -f2 ccData_t.nnv >p
for i in $(line);

do

cut -fi+1 ccData_t.nnv |sed "s/^/"i":/" >ti
echo paste p t1 t2 t3 t4 |grep -v pro >svm_train_model1.tsv
done < FILE

In the end I have to have all columns appended together as such.

1:45 6:45 62:45

1:56 6:34 62:23

1:56 6:32 62:52

1:69 6:12 62:123
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