Commands by leovailati

Commands by leovailati (5)

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Stream audio over ssh

This one doesn't need to convert to wav.
This is sample output - yours may be different.
6

ssh [user]@[address] "mpg321 -" < [file].mp3

leovailati · 2010-07-30 00:23:13 0
See udev at work

See how your system works with pendrives/mice/monitors/whatever-you-can-plug-in. Use cases: see on which /dev/... your peripherals are, find out if a specific udev rule is being applied correctly.
This is sample output - yours may be different.
20

udevadm monitor

leovailati · 2010-06-27 00:16:41 0
Use tagged vlans

Great for sysadmins! Don't forget to pass the vlan to your port in a manageable switch. After vconfig, you should use sudo ifconfig eth0.[VID] up Now the interface is up, you can use dhclient or ifconfig again to get an ip address.
This is sample output - yours may be different.
1

sudo vconfig add eth0 [VID]

leovailati · 2010-05-15 21:32:24 0
Change attributes of files so you can edit them

I had problems in Ubuntu while trying to edit /etc/resolv.conf, even with sudo I couldn't make any change. After a 2 minutes search on google I found this command. Hope someone finds it useful. It works like chmod, with + and - to denote which attributes are being added and which are being removed. See other attributes on man pages or on wikipedia http://en.wikipedia.org/wiki/Chattr
This is sample output - yours may be different.
1

sudo chattr -i <file that cannot be modified>

leovailati · 2010-03-25 03:14:34 0
Move itens from subdirectories to current directory

You WILL have problems if the files have the same name. Use cases: consolidate music library and unify photos (especially if your camera separates images by dates). After running the command and verifying if there was no name issues, you can use ls -d */ | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs rm -r to remove now empty subdirectories.
This is sample output - yours may be different.
-1

ls -d */* | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs mv -t $(pwd)

leovailati · 2010-03-01 23:43:26 2

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list block devices

Shows all block devices in a tree with descruptions of what they are.

Pulls email password out of Plesk database for given email address.

This simply pulls the password out of the database for the given mail name for ease of use in testing emails that you would not normally have access to.

rotate a one page pdf to 90 Degrees Clockwise

This can be taken from the pdftk docs http://www.pdflabs.com/docs/pdftk-man-page/ http://www.pdflabs.com/docs/pdftk-cli-examples/ , but the command examples are not simple.

multiline data block parse and CSV data extraction with perl

extract data in multiline blocks of data with perl pattern matching loop

100% rollback files to a specific revision

Generate random valid mac addresses

Python Alternative

backup all your commandlinefu.com favourites to a plaintext file

Usage: clfavs username password num_favourite_commands file_in_which_to_backup

Tar - Compress by excluding folders

If you give tar a list of filenames, it will not add the directories, so if you don't care about directory ownership or permissions, you can save some space. Tar will create directories as necessary when extracting. This command is limited by the maximum supported size of the argument list, so if you are trying to tar up the whole OS for instance, you may just get "Argument list too long".

In place line numbering

Add permanent line numbers to a file without creating a temp file. The rm command deletes file10 while the nl command works on the open file descriptor of file10 which it outputs into a new file again named file10. The new file10 will now be numbered in the same directory with the same file name and content as before, but it will in fact be a new file, using (ls -i) to show its inode number will prove this.

Count number of files in a directory

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