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Shell Programming and Scripting

For loop variable to take value linewise, not word-wise

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Top Forums Shell Programming and Scripting For loop variable to take value linewise, not word-wise
# 1  
Old 11-06-2008
Lightbulb For loop variable to take value linewise, not word-wise
Hi All,

Please consider the below scenario.

Code:
/home/pranav> cat > abc.txt
abc def
xyz 123
/home/pranav>
/home/pranav> cat > test_for.ksh
#!/bin/ksh

for i in `cat abc.txt`
do
echo $i
done
/home/pranav>
/home/pranav> ksh test_for.ksh
abc
def
xyz
123
/home/pranav>

The point I am tryign to make is that, 'abc' 'def' are in the same line, the for variable is taking these values separately.

I want that the for variable, [$i in the above example] should take up values like 'abc def' and 'xyz 123' and not each wod separately.

Note: The loop should as many times as there are lines in the file [2 times aove example] and not the number of words [4 times as shown above].
# 2  
Old 11-06-2008
Code:
#!/bin/ksh

while i=$(line)
do
  echo $i
done < abc.txt

Last edited by jlliagre; 11-06-2008 at 08:10 AM..
# 3  
Old 11-06-2008
while read line
do
echo $line
done < file_name
# 4  
Old 11-06-2008
MySQL thanks mate!
it did just what I needed.. will egt back in case of any further extensions to the same.

till then.. ciao!
# 5  
Old 11-06-2008
Can be stripped down a little further:
Code:
while read
do
    echo $REPLY
done < file_name

# 6  
Old 11-20-2008
I have a problem with 'while'
I am trying to set variables by 'while' and it is fine inside, but after complettig the loop all changes are lost:
Code:
> bb="kkkk-111\nlllll-22222\nbbbb-4444"
> echo "$bb"
kkkk-111
lllll-22222
bbbb-4444
> nn=""
> echo "$bb"|while read ln; do 
  nn=$nn", "$(echo $ln|cut -d- -f2); 
  echo $nn; 
done; 
echo "otside: \n$nn"
, 111
, 111, 22222
, 111, 22222, 4444
otside:
>

After 'while' internal changes are lost!
Is it how it should be?
It seems as 'while' is processing in separated shell.
Is here any way to make it works for lokal variables?

The 'for ..' loop works different"
Code:
> nn=""
> for ln in $(ec "$bb"|nawk 'NF {print "\""$0"\"";}'); do 
  nn=$nn", "$(ec $ln|sed 's/"//'|cut -d- -f2); 
  ec $nn; 
done; 
ec "otside: \n$nn"
, 111"
, 111", 22222"
, 111", 22222", 4444"
otside:
, 111", 22222", 4444"
>

# 7  
Old 11-20-2008
Your script should just work with ksh.
I guess you are using bash which use a subshell for the wrong (IMHO) side of a pipe ...
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