How do you run a command for each line of a file?

Question

For example, right now I\'m using the following to change a couple of files whose Unix paths I wrote to a file:

cat file.txt | while read in; do chmod 755 \"         


        

Answer 1

If you know you don't have any whitespace in the input:

xargs chmod 755 < file.txt

If there might be whitespace in the paths, and if you have GNU xargs:

tr '\n' '\0' < file.txt | xargs -0 chmod 755