Input: $ cat sample.txt
This is sample file
This is normal text file
Source: $ cat readfile.sh
#!/bin/bash
i=1;
FILE=sample.txt
# Wrong way to read the file.
# This may cause problem, check the value of 'i' at the end of the loop
echo "###############################"
cat $FILE | while read line; do
echo "Line # $i: $line"
((i++))
done
echo "Total number of lines in file: $i"
# The worst way to read file.
echo "###############################"
for fileline in $(cat $FILE);do
echo $fileline
done
# This is correct way to read file.
echo "################################"
k=1
while read line;do
echo "Line # $k: $line"
((k++))
done < $FILE
echo "Total number of lines in file: $k"
Output: $ ./readfile.sh
###############################
Line # 1: This is sample file
Line # 2: This is normal text file
Total number of lines in file: 1
###############################
This
is
sample
file
This
is
normal
text
file
################################
Line # 1: This is sample file
Line # 2: This is normal text file
Total number of lines in file: 3
