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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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Using sed to print newlines as doing it in one line with diff is non-trivial.
Sometimes you need to compare two config files on different servers. Put the file names into the above script and let 'er rip.
The result of this command is a tar with all files that have been modified/added since revision 1792 until HEAD. This command is super useful for incremental releases.
M - current revision, N - older revision
This form is used in patches, svn, git etc. And I've created an alias for it:
alias diff='diff -Naur --strip-trailing-cr'
The latter option is especially useful, when somebody in team works in Windows; could be also used in commands like
svn diff --diff-cmd 'diff --strip-trailing-cr'...
If colordiff utility installed, it is sometimes handy to call this command. Of course, you should create an alias for it. E.g. svndiff.
I often use it to find recently added ou removed device, or using find in /dev, or anything similar.
Just run the command, plug the device, and wait to see him and only him
I had the problem that the Md5 Sum of a file changed after copying it to my external disk.
This unhandy command helped me to fix the problem.
Use zsh process substitution syntax.
**NOTE** Tekhne's alternative is much more succinct and its output conforms to the files actual contents rather than with white space removed
My command on the other hand uses bash process substitution (and "Minimal" Perl), instead of files, to first remove leading and trailing white space from lines, before diff'ing the streams. Very useful when differences in indentation, such as in programming source code files, may be irrelevant
Checks if a web page has changed. Put it into cron to check periodically.
Change http://www.page.de/test.html and firstname.lastname@example.org for your needs.
on a dpkg managed system this PATTERN will help you generate .deb files from source AND remove all the dev libs you had to install. i hate cluttering up my machine with rouge packages and headers.
it would be pretty darn easy on rpm systems as well. i just dont have a rpm managed system to test on right now.
NOTE, you sharp ones will notice that it uninstalls the deb you just made! yeah, but the deb is still there to do with it what you want, like re install it. or you can just grep -v after the diff
This only works in bash
If you like to view what has been changed between revision 100 and the BASE on FILE. Meld will give you a nice overview.
Will colorize your svn diff.
This command takes a snapshot of the open files for a PID 1234 then waits 10 seconds and takes another snapshot of the same PID, it then displays the difference between each snapshot to give you an insight into what the application is doing.
This will cause diff to ignore any files whose path matches "*CVS*", ie any CVS control files.
This is useful when you're diffing two files of the same name in radically different directory trees. For example:
then run the command. Much easier on the eyes when you're looking back across your command history, especially if you're doing the same diff over and over again.
Makes sure the contents of "myfile" are the same contents that the author intended given the author's md5 hash of that file ("c84fa6b830e38ee8a551df61172d53d7").