Shell traverses each line of the file

Because the use for to read in the file line, will automatically put the space and newline characters as the same delimiter, because when there are spaces in the line, the output will be very messy, so ...

Cat Input.txt |while Read line
> Do
> Echo $line
> Done

Or:

While Read line
> Do
> Echo $line
> Done < Input.txt

To give an example of the actual point (change all directory permissions to 755, all files are 644):

# Find/-type F>filelist
# Find/-type D>dirlist
# cat Dirlist |while read i; Do chmod 755 "${i}"; Done
# cat FileList |while read i; Do chmod 644 "${i}"; Done

Reprinted from: http://www.hao32.com/unix-linux/338.html

Shell traverses each line of the file