Question

I have this script where I’m reading a text file line by line and executing a command. I found that the strings (aka lines) always ends with '\r'.

I wanna remove the CR from the end of the string.

This is how my code looks like:

file="myfilelist.txt"

while IFS= read -r filename
do

git log --oneline -- ${filename} |wc -l

done <"$file"

I wanna be able to perform the command in the loop without \r at the end of every line string (aka filename).

Answer 1

Try this:

git log --oneline -- $(echo "$filename" | tr -d '\r') | wc -l

Note that you don’t need the curly braces when $filename is surrounded by whitespace.

In principle you can also do this via bash’s own parameter expansion mechanism:

git log --oneline -- ${filename%^M} | wc -l

but the ^M has to be a literal control-M character, which is ugly and difficult to maintain.

Or you can delete all whitespace characters at the end of the name (which includes ^M as well as space, tab, et al):

git log --oneline -- ${filename%[-[:space:]]} | wc -l

But now we’re getting into techniques that very few people are likely to recognize without reading the manual.