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Process each line in an input file from the command line (or in a shell script)
Process each line in an input file from the command line (or in a shell script)
Let's say you have a file filelist.txt containing a list of file names, one in each row:
file1.txt
file2.txt
file3.txt
...
To just list each line in that file, type from the command line:
while read line; do echo $line; done < filelist.txt
(Not really very useful - cat filelist.txt would be a lot easier - but you get the idea.)

To long-list each file, type:
while read line; do ls -l $line; done < filelist.txt
To make a backup of each file to the directory backup, type:
mkdir -p backup; while read line; do cp $line backup/; done < filelist.txt
In a shell script, you normally put a while loop on several lines:
#!/bin/sh
while read line; do
    some_command_with $line
done <$file                   

Troubleshooting: Seeing this boring output instead of a nice list?
: No such file or directory
: No such file or directory
: No such file or directory
If you edited the file with some MS Windows editor, the file may contain some Carriage Returns.
Remove them with:
perl -pi -e 's/\r\n/\n/g' filelist.txt
Last modified: Wed Mar 21 15:50:33 Romance Standard Time 2007