Any unix gurus around? Need some help.
 

So I have a list of file names in txt format that should be in directory A. Turns out that some files are missing and I need to find out which ones. Is there way to run thru the list of required files from files.txt and spool list of missing files to missing.txt ?

so I have ---> xargs -a files.txt ......

Help brother out. :helpme

ls -1 a/ >have.txt
diff -Bb have.txt want.txt

Ps you may need to sort your list first:
sort want.txt > sorted.txt

diff sorted.txt have.txt


diff is also great for figuring out what changed between two versions of a file:
diff -Bb file.bak file.html

Thank you man. I didn't even think that way.
Thinking more of a programer with loops and ifs.
Happy holidays to you !!!