character missing when reading from file in shell script-CodePudding

in shell script I'm trying to read a file line by line using while loop but character 'n' is replaced with blank space in all lines.

here is the output of cat namespaces.tx

     cat namespaces.txt
default
kube-node-lease
kube-public
kube-system
name
mane
mann

here is the output it is printing when reading from while loop

while IFS=$'\n' read -r line; do echo $line; done < namespaces.txt
default
kube- ode-lease
kube-public
kube-system
ame
ma e
ma

CodePudding user response：

while IFS= read -r line; do
    echo "$line"
done < namespaces.txt

This is the correct way to read and print a line at a time. "$line" is quoted, and IFS can be set to empty.

Check for IFS=\n, or similar, in your script. Somewhere, you have set IFS to contain n. Then when you print $line with no quotes, it gets split in to multiple words by IFS (n), and echo prints each word given to it, with a space in between.