Write array contents to file


 
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# 1  
Old 12-16-2011
Write array contents to file

Hi,

I have a bash script that currently holds some data. I am trying to write all the contents to a file called temp.txt.

I am using
Code:
echo ${array[@]} > temp.txt

The problem that I am experiencing is that the elements are being written horizontally in the file. I want them written vertically.

This code writes it correctly but it appends the file which I don't want it to do.

Code:
for j in "${array[@]}"
do
  echo $j >>temp.txt
done

By changing the line to echo $j > temp.txt, the file only contains the last array element.



Example

array[0] = 5
array[1] = 6
array[2] = 1
array[3] = 3

File contents

5 6 1 3

What I want is

5
6
1
3

Thanks.

Last edited by Franklin52; 12-16-2011 at 12:59 PM.. Reason: Please use code tags for data and code samples, thank you
# 2  
Old 12-16-2011
You can move your redirection to the end of the loop, and use a single redirection that will overwrite the file:

Code:
for j in "${array[@]}"
do
      echo $j 
done >tmp.txt


Last edited by agama; 12-16-2011 at 03:01 AM.. Reason: indention
This User Gave Thanks to agama For This Post:
# 3  
Old 12-16-2011
Code:
echo ${x[@]} | sed 's/ /\n/g' > temp.txt

This User Gave Thanks to balajesuri For This Post:
# 4  
Old 12-16-2011
Thanks Agama

Your suggestion worked perfectly.
# 5  
Old 12-16-2011
Code:
> temp.txt   # clear file or create
for j in ${array[@]}
do
     echo $j >>temp.txt
done

Code:
for j in ${array[@]}
do
   echo $j 
done >> temp.txt  # append   or  done > temp.txt to overwrite

# 6  
Old 12-16-2011
No need to use loops or sed to separate an array on newlines. The shell can do this by itself by changing the IFS variable into a newline, letting you print the entire array in a single operation.
Code:
OLDIFS="$IFS"; IFS=$'\n'
        echo "${ARRAY[*]}" > file
IFS="$OLDIFS"

Note that "${ARRAY[*]}" must be in quotes for IFS to have the right effect here.
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