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
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