09-22-2010
How to compare files in two folders using cmp?
i recently copied 400GB of data from a NTFS drive to a ext4 drive. I want to verify that the data is 100% identical to the original.
I wanted to use cmp but it only does two files. The directory that was copied contains many subdirectories and all sorts of files (not just text).
So I guess what I want to know is:
1. Is CMP the right command to use to compare (verify identical data) of two files regardless of its type? eg video, document, executable, zip, encrypted file etc
2. How would you write a quick shell script to compare two folders?
So far i thought of two ways:
1. supply the directories of each:
Source: /media/ntfsdrive/data
New Copy: /media/ext4drive/data
But this seems difficult.
2. run find . in each directory (source and the new copy) - should b exactly the same if you output to a file and do a diff.
some how run CMP for each listing.
This seems difficult too but some what easier. I have no shell programming experience though, so does anyone know a quick way of doing this? Any help would be highly appreciated. Thank you!
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I am comparing two files which are identical except for the timestamp which is incorporated within the otherwise same 372 bytes. I am using the command:
cmp -s $Todays_file $Yesterdays_file -i 372
When I run the command without the -i 372 it shows the difference i.e. the timestamp.... (5 Replies)
Discussion started by: gugs
5 Replies
2. Shell Programming and Scripting
Hello,
I try to compare 2 folders, i explain, i have file in this 2 folder and i want to print out the difference in this folders...
ex: folder1: file1 file2 file3
folder2: file1 file2
print file3
I do a ls of the 2 folders and i use the command diff (diff $var1 $var2) without... (8 Replies)
Discussion started by: protocomm
8 Replies
3. Shell Programming and Scripting
Hi All,
I have to compare set of files so I created a case statement with the option to give more than one file to compare. The Problem now i am facing is, if I compare the files directly, from prompt or just using the script only for a particular file then It's saying No difference, but If I... (4 Replies)
Discussion started by: Sudhar
4 Replies
4. Shell Programming and Scripting
Hi
I have 2 different folders on different machines. they are supposed to be same but some time for unknown reason they are not. then we have to generate a report for files which are not matching.
I was doing as below -
cd folder1
find . -type f | sort | cksum >1.txt
cd folder2
find .... (7 Replies)
Discussion started by: reldb
7 Replies
5. Shell Programming and Scripting
I do not know much about shell scripting so I am at a loss here. If someone can help me, that would be great!
I have two directories
/dir1
/dir2
I need to delete all files from /dir1 and that does not have a correspondent file in /dir2. It should NOT check file suffixes in /dir2 . Why?... (20 Replies)
Discussion started by: kaah
20 Replies
6. Shell Programming and Scripting
Hi, all:
I've got two folders, say, "folder1" and "folder2".
Under each, there are thousands of files.
It's quite obvious that there are some files missing in each. I just would like to find them. I believe this can be done by "diff" command.
However, if I change the above question a... (1 Reply)
Discussion started by: jiapei100
1 Replies
7. UNIX for Dummies Questions & Answers
Hello again,
A little while back I got help with creating a command to search all directories and sub directories for files from daystart of day x.
I'm wondering if there is a command that I've overlooked that may be able to search for / write folder names to an output file which ideally... (2 Replies)
Discussion started by: Aussiemick
2 Replies
8. Shell Programming and Scripting
Hi,
I need help in shell scripting. If someone can help me, that would be great!
Problem. I want Linux Script to compare two folders and copy missing files.
Description.
I have two directories
/dir1
/dir2
I need to copy all distinct/new/unique/missing files from /dir1 and that... (1 Reply)
Discussion started by: S.Praveen Kumar
1 Replies
9. Shell Programming and Scripting
Hi,
So i know we use cp -r as a basic to copy folders/files.
I would like this BUT i would like to show the output of the files being copied.
With the amazing knowledge i have i have gone as far as this:
1) find source/* -exec cp -r {} target/ \;
2) for ObjectToBeCopied in `find... (6 Replies)
Discussion started by: Imre
6 Replies
10. Shell Programming and Scripting
Hello, my first thread here.
I've been searching and fiddling around for about a week and I cannot find a solution.:confused:
I have been converting all of my home videos to HEVC and sometimes the files end up smaller and sometimes they don't. I am currently comparing all the video files... (5 Replies)
Discussion started by: Josh52180
5 Replies
ZDIFF(1) General Commands Manual ZDIFF(1)
NAME
zcmp, zdiff - compare compressed files
SYNOPSIS
zcmp [ cmp_options ] file1 [ file2 ]
zdiff [ diff_options ] file1 [ file2 ]
DESCRIPTION
Zcmp and zdiff are used to invoke the cmp or the diff program on files compressed via gzip. All options specified are passed directly to
cmp or diff. If only file1 is specified, it is compared to the uncompressed contents of file1.gz. If two files are specified, their con-
tents (uncompressed if necessary) are fed to cmp or diff. The input files are not modified. The exit status from cmp or diff is pre-
served.
SEE ALSO
cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1), gzip(1), gzexe(1)
BUGS
Messages from the cmp or diff programs may refer to file names such as "-" instead of to the file names specified.
ZDIFF(1)