On Wed, 2003-09-24 at 22:13, Bill Gradwohl wrote:
> I'm trying to read a file into an array and not having much success.
>
> The following test script is self contained.
>
> #!/bin/bash
>
> # Create a test file to read
> cat >/tmp/junkfile <<-"CODE"
> line 1
> line 2
> line 3
> CODE
>
> echo ===========Loop 1==============
> declare -a RULES
> i=0
> j=4
>
> # Read the test file line by line into the RULES array.
> cat /tmp/junkfile| while read x; do
> RULES[i++]="$x"
> # Show what RULES contains
> echo j=$j i=$i RULES has ${#RULES[*]} elements. ${RULES[*]}
> done
> echo j=$j i=$i RULES has ${#RULES[*]} elements. ${RULES[*]}
>
>
> echo ===========Loop 2==============
> declare -a rules
> i=0
> j=4
>
> while test $i -lt 3; do
> rules[i++]="line $((i+1))"
> # Show what rules contains
> echo j=$j i=$i rules has ${#rules[*]} elements. ${rules[*]}
> done
> echo j=$j i=$i rules has ${#rules[*]} elements. ${rules[*]}
>
> rm /tmp/junkfile
>
> ///////////////////////////////////////////////////////////////////////
> If you run it (its harmless) you'll get the following output:
>
> ===========Loop 1==============
> j=4 i=1 RULES has 1 elements. line 1
> j=4 i=2 RULES has 2 elements. line 1 line 2
> j=4 i=3 RULES has 3 elements. line 1 line 2 line 3
> j=4 i=0 RULES has 0 elements.
> ===========Loop 2==============
> j=4 i=1 rules has 1 elements. line 1
> j=4 i=2 rules has 2 elements. line 1 line 2
> j=4 i=3 rules has 3 elements. line 1 line 2 line 3
> j=4 i=3 rules has 3 elements. line 1 line 2 line 3
>
> The first loop appears to stuff the array with values and i is steadily increasing.
> After the loop ends, i is 0 and the array is empty. Why?
> Since i & j are initialized prior to loop start, and displayed during the loop, why is j's value maintained across the loop and i appears to get reinitialized to the pre loop value?
>
> The second loop is similar. Again j keeps its value the entire time, and i gets increased steadily. At loop end both j and i are what I would expect them to be.
>
> How are these two loops different? It has to have something to do with the read statement but I can't figure it out.
>
> Thank You
>
> Bill Gradwohl
> (817) 224-9400 x211
> www.ycc.com
> SPAMstomper Protected Email
I haven't spent much time looking at this, but it sounds to me more like
a job for awk.
--
Chris Kloiber
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