Commands by Darkstar (3)

What's this? is the place to record those command-line gems that you return to again and again. 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.

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Run a ext4 file system check and badblocks scan with progress info
Nothing fancy, just a regular filesystem scan that calls the badblocks program and shows some progress info. The used options are: -c ? check for bad sectors with badblocks program -D ? optimize directories if possible -f ? force check, even if filesystem seems clean -t ? print timing stats (use -tt for more) -y ? assume answer ?yes? to all questions -C 0 ? print progress info to stdout /dev/sdxx ? the partition to check, (e.g. /dev/sda1 for first partition on first hard disk) NOTE: Never run fsck on a mounted partition!

Backup with versioning
Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by the excellent EVACopy

Check all bash scripts in current dir for syntax errors
Check all bash scripts in current dir for syntax errors WITHOUT running them.

Run the last command as root
Useful when you forget to use sudo for a command. "!!" grabs the last run command.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Open (in vim) all modified files in a git repository
For editing files added to the index: $ vim `git diff --name-only --cached` To edit all changed files: $ vim `git diff --name-only HEAD` To edit changed files matching glob: $ vim `git diff --name-only -- '*.html'` If the commands needs to support filenames with whitespace, it gets a bit hacky (see for the reason): $ git diff --name-only -z | xargs -0 bash -c '

convert a mp4 video file to mp3 audio file (multiple files)

umount all nfs mounts on machine

Convert numbers to SI notation
converts any number on the 'stdin' to SI notation. My version limits to 3 digits of precious (working with 10% resistors).

move a lot of files over ssh
Useful to move many files (thousands or millions files) over ssh. Faster than scp because this way you save a lot of tcp connection establishments (syn/ack packets). If using a fast lan (I have just tested gigabyte ethernet) it is faster to not compress the data so the command would be: tar -cf - /home/user/test | ssh [email protected] 'cd /tmp; tar xf -'

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