- Semesters - Project Work by Semester
- Experiments - List of speech experiments
- [Unix Notes]
- Speech Corpus Setup - Switchboard, NOAA
- Speech Recognition Related Readings
- Experiment Setup
- Scripts Page
- Model Building - more info on data prep, language models, & building models
Tips to use this Wiki
To put something in bold, either highlight and click the B in the toolbar above, or just type in three single quotes on either side of your text.
To make a box around something (usually code snippets or commands) simply make sure your line of text is on its own line and hit the space bar right at the beginning of the line so that there is one space before the text begins. When you save it, you'll see a light gray box around your text.
If you want to use Notepad++ and you like to to copy/paste your commands, you might bring along some wiki formatting messing up your commands. Use regular notepad in Windows, which has no formatting in the background that might carry over when you copy/paste commands.
Remember this when you're having issues with file permissions.
For more specialized needs, see below, personal logs and Google.
Useful Unix Commands
- To find out which hosts there are, use command cat /etc/hosts
- To find out what release version you have, use command cat /etc/*-release on the machine you are currently on.
Basic Unix Commands
- ls or dir will show you the files in the directory you are in.
- ls -al with show all of the files in directory(even hidden files)
- cd changes the directory you are in. Example would be cd / which will take you to the root or top directory.
- pwd is the command that tells you where you are in the hierarchy of the system
- whoami will tell you what profile you are using
- man and a command opens the Linux manual pages. Man pages are useful for learning which flags (options) you can use to modify or refine a command.
- To exit a man page, type q.
- If you get stuck Ctrl C might work.
- q to quit
- ssh and computer name or IP address will secure shell you into the machine.
- exit will close the session you are on or exit you from a machine you ssh into.
- top displays information about who is using the machine you are in, CPU % being used and much more
Detailed Unix Commands
Hardware and System
hwinfo - extended hardware informationar hwinfo --short --wlan - hardware info hwinfo --short --gfxcard lspci - pci information ethtool - Ethernet card settings free -m - available memory ps - process status top - list processes and their usage who - usernames of whoever is currently logged in uname -r - check kernel version ls -l /dev/disk/by-id df -h - used disk space dmidecode -t memory - memory configuration to include type and bank location
arp - check host network netstat - networking info netstat | head - summary network information netstat -rn - show routes nslookup - query name servers ping - ICMP request ip - configure a network interface route - routing information ip route - find your gateway cat /etc/resolv.conf - find your DNS servers ethtool - configure ethernet settings
ls -a - lists all files, including hidden files ls -t - lists files sorted by date and time ls -l - long listing of files, with files permissions and other info ls -alt - long list of all files by date and time << useful to find out when and by whom a file that is causing problems was changed dir - list directory contents vdir - verbose directory info fdisk -l - list all disk and partitions cfdisk - partition table manipulation fscheck - file system consistency check and repair <<< only run if you suspect problems with the drives format - format disks mount cat /proc/mounts - lists mounted file systems mount caesar:/mnt/main /mnt/main - to mount shared file system from caesar wc filename - will display the number of lines, words, and bytes in a file tr ' ' '\n' < filename | sort -u | wc -w displays the number of unique words in a file (assuming they are separated by a space) tail -f filename - displays output from whatever file is currently being written to ex. tail -f decode.log Note: You may want to run the above command in a second terminal window to make sure it doesn't interfere with the current process To open a second terminal window, right-click on the toolbar at the top and choose "duplicate session"
SSH Password Override
Using SSH, log in to your account created for you on Caesar. When you log in you should be directed to your home directory.
% sp<semester year>/<user id>
Now that you are at the home directory for your user you want to do the following command to make an SSH key for your user.
ssh-keygen -t rsa
It will prompt the questions below:
Generating public/private rsa key pair. Enter file in which to save the key (/home/<user id>/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again:
- Leave the file name the same.
- Leave the passphrase empty by simply pressing "Enter".
Now we want to go into the SSH folder:
You should have the following files in your .ssh folder: id_rsa and id_rsa.pub. To get the key to work so that you do not need a password on the batch machines you need to copy the .pub file to a new file called authorized_keys.
cp -i id_rsa.pub authorized_keys
Since all the machines share the same drive then when you try to SSH into another machine you will not need a password to log into the system.
- Fedora not allowing password-less log in.
- Possible Solution:
use_nfs_home_dirs parameter is turned on. Fedora comes with SELinux access control and by default the parameter is turned off which prevents a use of NFS home directory.
- To check if the use_nfs_home_dirs is enabled/disabled use this command
- To enable use_nfs_home_dirs use this command
setsebool -P use_nfs_home_dirs 1
- To disable use_nfs_home_dirs use this command
setsebool -P use_nfs_home_dirs 0