This is well know, and not a bug. Please read:
http://mywiki.wooledge.org/BashFAQ/024
when you run:
command | while-loop
the 'while-loop' part is executed in a subshell (actually, both commands are).
This means that they're no longer the same process as the main shell, and the
consequence is tha
HI:
one way:
#!/usr/bin/bash
a=0
FILE="myfile.txt"
cat $FILE | while read line
do
a=$(($a+1))
echo $a
#done < $FILE
done
echo "Final line count is: $a
two way:
#!/usr/bin/bash
a=0
FILE="myfile.txt"
while read line
do
a=$(($a+1))
echo $a
done < $FILE
echo "Final line count is: $a"
On
