Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

gendiff(1) [v7 man page]

GENDIFF(1)						      General Commands Manual							GENDIFF(1)

NAME
gendiff - utility to aid in error-free diff file generation SYNOPSIS
gendiff <directory> <diff-extension> DESCRIPTION
gendiff is a rather simple script which aids in generating a diff file from a single directory. It takes a directory name and a "diff- extension" as its only arguments. The diff extension should be a unique sequence of characters added to the end of all original, unmodi- fied files. The output of the program is a diff file which may be applied with the patch program to recreate the changes. The usual sequence of events for creating a diff is to create two identical directories, make changes in one directory, and then use the diff utility to create a list of differences between the two. Using gendiff eliminates the need for the extra, original and unmodified directory copy. Instead, only the individual files that are modified need to be saved. Before editing a file, copy the file, appending the extension you have chosen to the filename. I.e. if you were going to edit somefile.cpp and have chosen the extension "fix", copy it to somefile.cpp.fix before editing it. Then edit the first copy (somefile.cpp). After editing all the files you need to edit in this fashion, enter the directory one level above where your source code resides, and then type $ gendiff somedirectory .fix > mydiff-fix.patch You should redirect the output to a file (as illustrated) unless you want to see the results on stdout. SEE ALSO
diff(1), patch(1) AUTHOR
Marc Ewing <marc@redhat.com> 4th Berkeley Distribution Mon Jan 10 2000 GENDIFF(1)

Check Out this Related Man Page

GENDIFF(1)						      General Commands Manual							GENDIFF(1)

NAME
gendiff - utility to aid in error-free diff file generation SYNOPSIS
gendiff <directory> <diff-extension> DESCRIPTION
gendiff is a rather simple script which aids in generating a diff file from a single directory. It takes a directory name and a "diff- extension" as its only arguments. The diff extension should be a unique sequence of characters added to the end of all original, unmodi- fied files. The output of the program is a diff file which may be applied with the patch program to recreate the changes. The usual sequence of events for creating a diff is to create two identical directories, make changes in one directory, and then use the diff utility to create a list of differences between the two. Using gendiff eliminates the need for the extra, original and unmodified directory copy. Instead, only the individual files that are modified need to be saved. Before editing a file, copy the file, appending the extension you have chosen to the filename. I.e. if you were going to edit somefile.cpp and have chosen the extension "fix", copy it to somefile.cpp.fix before editing it. Then edit the first copy (somefile.cpp). After editing all the files you need to edit in this fashion, enter the directory one level above where your source code resides, and then type $ gendiff somedirectory .fix > mydiff-fix.patch You should redirect the output to a file (as illustrated) unless you want to see the results on stdout. SEE ALSO
diff(1), patch(1) AUTHOR
Marc Ewing <marc@redhat.com> 4th Berkeley Distribution Mon Jan 10 2000 GENDIFF(1)
Man Page

15 More Discussions You Might Find Interesting

1. AIX

Locking a file when using VI to prevent multiple-edit sessions by diff users

At the office, we often have to edit one file with VI. We are 4-6 workers doing it and sometimes can be done at the same time. We have found a problem and want to prevent it with a file lock. Is it possible and how ? problem : Worker-a starts edit VI session on File-A at 1PM Worker-b... (14 Replies)
Discussion started by: Browser_ice
14 Replies

2. Shell Programming and Scripting

redirect after the diff

hi, i have 2 file of the same kind file_old and file_new there are few extra things added in new file i want to make diff file_old file_new > file_update ( file_update are the new things added as compare to the old file ) i can i make it clearly . bcoz in diff it show all the... (8 Replies)
Discussion started by: mail2sant
8 Replies

3. Shell Programming and Scripting

Best way to diff two huge directory trees

Hi I have a job that will be running nightly incremental backsup of a large directory tree. I did the initial backup, now I want to write a script to verify that all the files were transferred correctly. I did something like this which works in principle on small trees: diff -r -q... (6 Replies)
Discussion started by: same1290
6 Replies

4. Shell Programming and Scripting

replace *.sqc files with *.sqC extension

Hi everyone, I want to know how to replace file extensions. For example how do i go about replacing all *.c files in a directory to *.cpp I think we can do it either with "find" commad or with special registers. I tried to use the following command mv \(.*\).c \1.cpp but it is giving... (7 Replies)
Discussion started by: rameshonline
7 Replies

5. Shell Programming and Scripting

write a script for this pattern...

I have a file say test.txt, data in that file is in format such that 1st column represents number of executions of particular function 2nd column represents total amount of time 3rd column represents function name I want to get the poor/slow performing function from this file. So, ideally... (13 Replies)
Discussion started by: Rahulpict
13 Replies

6. Shell Programming and Scripting

Delete a file after 3 days

Hi.. Am using diff to compare 2 directories(A & B) and as ouput i get a list of files which are found only in directory B ( I used grep & sed to create the list). Now I want to delete the files which are found only in dir B after 3 days. Please help me with this. Thanks CoolAtt (7 Replies)
Discussion started by: coolatt
7 Replies

7. UNIX for Dummies Questions & Answers

convert all *. c files to *.cpp files in a directory

Hiiiii.... how to convert all *. c files to *.cpp files , in a directory given using shell script. :pThnaking u.:p (10 Replies)
Discussion started by: krishnampkkm
10 Replies

8. UNIX for Dummies Questions & Answers

How to get size of a list of files with specified extension?

Command ls -l *cpp lists all cpp program files in a directory. It shows the size of each file. Using a calculator to work out the total size of the cpp files would be very tedious. Is there a way to get the total size from the command line? (5 Replies)
Discussion started by: resander
5 Replies

9. Shell Programming and Scripting

Replace file name extension in loop

Hi! I have this shell script that I need to finish. Currently I need to fix one line to make it work. I need to change a file extension. See this code, is pretty simple. #!/bin/sh # Extensions OLD_EXT=.flv NEW_EXT=.mp4 COUNT_FILES=$(ls -l *$OLD_EXT | grep ^- | wc -l) if ; then ... (8 Replies)
Discussion started by: pulsorock
8 Replies

10. Shell Programming and Scripting

stderr/stdout

Can somebody explain to me why the diff output is not going to stderr? Yet when I issue a diff from the command line the return code is -ne 1. I am guessing diff always writes to stdout??? Is there away I can force the difff to write to stderr USING THE CURRENT template. If possible, I... (5 Replies)
Discussion started by: BeefStu
5 Replies

11. UNIX for Dummies Questions & Answers

copying files of certain extension?

Hi, I am using scp to copy a certain directory over the network. This folder contain some files that I am not interested in. My question is; is it possible to copy files of certain extension only, keeping the same directory hierarchy as it is (that is sub-folders)? Thanks (8 Replies)
Discussion started by: faizlo
8 Replies

12. UNIX for Dummies Questions & Answers

copy all files matching the request and change the extension at the same time

Hi everyone When I'm starting my script I'm giving to it two parameters: script.sh ext1 ext2 I need to copy all files in a directory fitting ext1, to the same folder, with the same names, but with the changed extension to ext2. Till now I've just managed to do it for only 1 file, but I... (16 Replies)
Discussion started by: vacuity93
16 Replies

13. Web Development

edit a file with PHP.

Ok here is what I have going on. I am listing the contest of a directory so I can edit and delete files. The code I am using to do that is below (Other then editing as it does not work). <?php $directory = ("enctlfiles/"); $dir = opendir($directory); $files = array(); while (($file =... (10 Replies)
Discussion started by: GroveTuckey
10 Replies

14. Shell Programming and Scripting

Help me please to fix my error

Can you help me to fix my error please?! I checked the code and I think there is no mistake, but when I run it gives me error such line 1: /Users/Manu/trials/hosts: is a directory sort: open failed: /Users/Manu/trials/hosts/*: No such file or directory Help me please... mycode NAME value.... (9 Replies)
Discussion started by: Manu1234567
9 Replies

15. Shell Programming and Scripting

Comparing two directories with diff

Hi all, I have 2 directories on two different servers. I am trying to find out what is missing from directory X and what is missing from directory Y. they should both have the same exact files in them. I understand some files may be missing from both directories on each server. I am not sure... (8 Replies)
Discussion started by: jeffs42885
8 Replies