commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/
You can sign-in using OpenID credentials, or register a traditional username and password.
First-time OpenID users will be automatically assigned a username which can be changed after signing in.
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.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
Subscribe to the feed for:
Useful, when you need to backup/copy/sync a folder over ssh with a non standard port number
Assumed dir A, B, C are subdirs of the current dir
Exact syntax of the command is:
rsync -v -r --size-only --compare-dest=/path_to_A/A/ /path_to_B/B/ /path_to_C/C/
(do not omit end-slashes, since that would copy only the names and not the contents of subdirs of dir B to dir C)
You can replace --size-only with --checksum for more thorough file differences validation
-n, --dry-run perform a trial run with no changes made
Alternative for machines without ssh-copy-id
Copy the current path. Use -selection clipboard to copy the string to clipboard.
rsync will copy the source directory into destination and any subsequent run will synchronize only the changes from the source.
a : to keep files permissions
--no-whole file : use rsync?s delta-transfer algorithm
--inplace : writes the updated data directly to the destination file
optionnal -> add --remove-source-files to mv instead of cp
If any changes have been made to the package while it was unpacked (ie, conffiles files in /etc modi‐fied), the new package will inherit the changes.
This way you can make it easy to copy packages from one computer to another, or to recreate packages that are installed on your system, but no longer available elsewhere.
Note: dpkg-repack will place the created package in the current directory.
An example config file is placed in the sample output along with the command line call to use it.
The rsync daemon here is setup on the destination, thus requiring the read only = false flag. Also it uses uid and gid of root, change as required.
-r for recursive (if you want to copy entire directories)
src for the source file (or wildcards)
dst for the destination
--progress to show a progress bar
.flac is the filetype.
/Volumes/Music/FLAC is the destination.
It's not better than the former, just another possible way.
Credits to whansard
The command finds all .mp3 files in all subfolders from where it's ran, catches its "relative path" and creates inside /new/path/ with the same "relative path".
PS: /new/path/ must exists
Use case: folder with flac files with tree structure ../artist/album/number-title.flac
1) convert flac->mp3 in the same folder: http://www.commandlinefu.com/commands/view/6341/convert-all-.flac-from-a-folder-subtree-in-192kb-mp3
2) search for mp3 files and recreate tree structure to another path: this command
3) move all mp3 files to that new folder: http://www.commandlinefu.com/commands/view/8854/move-mp3-files-to-another-path-with-existing-subtree-structure
Bash function copies a file prefixed with a version number to a subdirectory
This is a BASH feature.
The above command will create a backup of "filename" called "filename.DATE", where DATE is the actual day in %Y%m%d (year, month and day numbers together) format.
Clone directory structure without the files
Maybe it could work for any music player if you change "audacious2" with the string you see in `ps aux` for your player. Needs testing in different systems.
Adjust "sleep X" to your needs.
*NOTE: First sleep is required because bash doesn't have a "post-test" syntax (do XXX while).
This may seem like a long command, but it is great for making sure all file permissions are kept in tact. What it is doing is streaming the files in a sub-shell and then untarring them in the target directory. Please note that the -z command should not be used for local files and no perfomance increase will be visible as overhead processing (CPU) will be evident, and will slow down the copy.
You also may keep simple with, but you don't have the progress info:
cp -rpf /some/directory /other/path
Requires the dc3dd package - available at http://dc3dd.sourceforge.net
This script creates date based backups of the files. It copies the files to the same place the original ones are but with an additional extension that is the timestamp of the copy on the following format: YearMonthDay-HourMinuteSecond
This command will copy a folder tree (keeping the parent folders) through ssh. It will:
- compress the data
- stream the compressed data through ssh
- decompress the data on the local folder
This command will take no additional space on the host machine (no need to create compressed tar files, transfer it and then delete it on the host).
There is some situations (like mirroring a remote machine) where you simply cant wait for a huge time taking scp command or cant compress the data to a tarball on the host because of file system space limitation, so this command can do the job quite well.
This command performs very well mainly when a lot of data is involved in the process. If you copying a low amount of data, use scp instead (easier to type)