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Full Discussion: Compare file size and then copy/overwrite
Top Forums Shell Programming and Scripting Compare file size and then copy/overwrite Post 302968020 by Daniel Gate on Wednesday 2nd of March 2016 01:21:28 PM
Old 03-02-2016
Compare file size and then copy/overwrite
// 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!
 

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LEARN ABOUT DEBIAN

vgcfgrestore

VGCFGRESTORE(8) 					      System Manager's Manual						   VGCFGRESTORE(8)

NAME

       vgcfgrestore - restore volume group descriptor area

SYNOPSIS

       vgcfgrestore [-d|--debug] [-f|--file filename] [-l[l]|--list] [-h|--help] [-M|--Metadatatype1|2] [-t|--test] [-v|--verbose] VolumeGroupName

DESCRIPTION

       vgcfgrestore  allows  you  to  restore  the metadata of VolumeGroupName from a text backup file produced by vgcfgbackup.  You can specify a
       backup file with --file.  If no backup file is specified, the most recent one is used.  Use --list for a list of the available  backup  and
       archive files of VolumeGroupName.

OPTIONS

       -l | --list -- List files pertaining to VolumeGroupName
	      List  metadata  backup  and  archive  files  pertaining  to VolumeGroupName.  May be used with the -f option.  Does not restore Vol-
	      umeGroupName.

       -f | --file filename -- Name of LVM metadata backup file
	      Specifies a metadata backup or archive file to be used for restoring VolumeGroupName.  Often this file has been created with  vgcfg-
	      backup.

       See lvm for common options.

REPLACING PHYSICAL VOLUMES

       vgdisplay  --partial  --verbose will show you the UUIDs and sizes of any PVs that are no longer present.  If a PV in the VG is lost and you
       wish to substitute another of the same size, use pvcreate --restorefile filename --uuid uuid (plus additional arguments as appropriate)	to
       initialise  it with the same UUID as the missing PV.  Repeat for all other missing PVs in the VG.  Then use vgcfgrestore --file filename to
       restore the volume group's metadata.

SEE ALSO

       lvm(8), vgcreate(8)

Sistina Software UK					 LVM TOOLS 2.02.95(2) (2012-03-06)					   VGCFGRESTORE(8)
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