Edit a large text file
 

This should be easy and I dont know the best way to go about this. I have a large output of an ls command. The following is a part of the output.

I need to modify that to be this

assuming you have the file names in a file called /mnt/lfs/oldsrc, you could do something like:

#!/bin/bash
rm -rf /tmp/output
for LINE in `cat /mnt/lfs/oldsrc`; do
echo "/mnt/lfs/oldsrc/$LINE" >>/tmp/output
done

I think what you are looking for is actually some variation of the find or locate commands

try this:and let us know how you go.

If locate gives an error, you may not have an index database setup, in which case you need to run as root:

be careful with updatedb, it will run for a fair period of time if you have a large filesystem ~100GB or so in size.

Let us know how you get on.

The post from zQUEz looks good too!

I got the file by running Basically what I need is a list of every directory and file on the system. I was able to produce it using the command but it needs some editing. I really cant do it by hand because it is 34,384 lines long.

Hi,

Wouldn't this be a better(?) solution: find /mnt/lfs/

The 'only' difference between your desired output and that of the find command: You show a / after each dir (/mnt/lfs/oldsrc/ vs /mnt/lfs/oldsrc).

Which can also be accomplished with find:

Isn't this code equivalent to ?

I tried running this command, on my server.

Hi,

The difference can be found in the way directories are displayed, not the amount of files found.

find /mnt/lfs will show a directory as: /mnt/lfs/usr/bin

ntubski solution will show: /mnt/lfs/usr/bin/ (mind the extra slash on the end!)

Hope this clears things up.

Okay, will take a note of this.

Thanks