Linux commands

From WikiPaul - Paul Swanson's wiki

fuser -vm /media/drive 

Show what processes are using the drive

cat /proc/*/*/*/temperature  

Prints out cpu temperature, if available

ls -d */  

list only directories in current directory

source .bashrc  

reload .bashrc, etc.

!!

Does last command (useful for `sudo !!`)

convert -resize 800x600 *.jpg new.jpg  

A batch Imagemagick command that resizes every image in a directory to 800x600, and names them new-0.jpg, new-1.jpg... etc.

sudo smbmount //servername/share /media/mountpoint/ -o rw,credentials=.smbpasswd,workgroup=domain  

Mounts a Windows share

lpr -P HPpsc textfile.txt  

Prints the text file from the printer named HPpsc

sudo rdate ntp.alaska.edu  

Sets and prints the current time

acpi -V  

Prints thermal and battery charge info, if any

mencoder infile.wmv -ofps 23.976 -ovc lavc -oac copy -o outfile.avi 

Convert a wmv to avi (or whatever you want)

grep 'something' * | grep -v grep | awk -F\: '{print $1}' | xargs rm 

Search for 'something' in all the files in the directory, grab the first part of the result separated by colons (the filename), and pass that on to remove

find . -type f -exec /bin/ls -l {} \; | awk '{print $5 " " $8}' | sort -n 

find all files in a directory, and sort them by size.

ps aux | awk '{print $3 " " $11}' | sort -nr | head 

Print the 10 most cpu-heavy processes.

egrep '(string1|hurrblah|wazzup)' * | awk -F\: '{print $1}' | xargs rm 

Deletes all files in the current directory containing the strings 'string1', 'hurrblah', or 'wazzup'

Disk-based commands

dd if=/dev/hda | gzip > /media/drive_image.img.gz  

Creates a gzip-compressed image of the hard drive

gzip -dc /media/drive_image.img.gz | dd of=/dev/hda  

Uncompresses image and copies it back to the hard drive

dd if=/dev/hda | tee /dev/hdb /dev/hdc /dev/hdd /dev/hde 1>/dev/null  

Copies every byte of hda to hdb, hdc, hdd, and hde, and pipes stdout to null. Not parallel.

dd if=/dev/urandom of=/dev/hda  

Overwrites the first hard drive with random bytes

NTFS fun

sudo bash 

Makes all the following commands root

fdisk -l 

Look for NTFS on the right side, and remember its block location (/dev/sda1, /dev/hda2, etc)

mkdir /media/ntfs 

Make a directory in which to mount the partition

mount -t ntfs-3g /dev/hda2 /media/ntfs -o force,rw 

Mounts the partition to the directory

If that fails:

ntfsfix /dev/hda2 

Will reset the NTFS journal, so you can mount it, then run the mount command again