Shell Programming and Scripting

// Redhat

I have this code working, but need to add one more qualification so that I don't overwrite the files.

Code:

#!/bin/sh
cd /P2/log/cerner_prod/millennium/archive/
for f in *
do      [ -f "$f" ] || continue     #If this isn't a regular file, skip it.
        [ -e "/P2/backup/$f" ] && continue  #If a backup already exists, skip it.
        cp "$f" /P2/backup/          # Make a backup copy.
done

What I like to do is:

1) compare the size of the same file (i.e. p2_000001.gz).
2) if the file size (p2_000001.gz) under /P2/backup/ is larger than that under /P2/log/cerner_prod/millennium/archive/, then skip it
3) if if the file size (p2_000001.gz) under /P2/backup/ is smaller than that under /P2/log/cerner_prod/millennium/archive/, then copy or overwrite

In this case, /P2/backup/ will have always the latest file.

Please advise. Appreciate your help!

It won't be the latest but the largest file.

Do you NEED to run that with sh? Does your system have the stat (or equivalent) command?

---------- Post updated at 22:58 ---------- Previous update was at 22:49 ----------

With bash and stat:

Code:

 (( ($(stat -c"%s-" "$f" /P2/backup/"$f") 0)  > 0 )) && cp "$f" /P2/backup/

---------- Post updated at 23:03 ---------- Previous update was at 22:58 ----------

No bash required:

Code:

expr $(stat -c"%s >" "$f") $(stat -c"%s" /P2/backup/"$f") && cp "$f" /P2/backup/

Much appreciated!

Code:

 (( ($(stat -c"%s-" "$f" /P2/backup/"$f") 0)  > 0 )) && cp "$f" /P2/backup/

works absolutely charming.