Labs Help

1. Compile your program with debug information, and give it a name. -g is the option that allows the program to run in a debugger
   • g++ -g -o filename filename.cc
2. Start debugging program. Include execution name of program on command line.
   • gdb filename
3. Use break line number or break function name to add a break point.
4. Type run to start running the program.
5. Type clear to erase the breakpoint on the current line when the program stops at a break point.
6. Type bt to see the backtrack of function calls when the execution stops at a break point.
7. Type print expression to see the value of a variable or expression.
8. Type step to execute one line of code or cont to continue the execution of the program until the next break point.
9. Type stop to stop the execution of the program or quit to exit gdb altogether.

1.  Download the .iso file for the chosen distribution.
2. Put a blank CD or DVD into the DVD drive.
3. Click on the CD icon when it appears on the desktop.
4. Under the Places menu select: Computer.
5. Next select: File System.   Then select: iso
6. Select the Linux distribution downloaded.
7. Right click on the first disk image file.
8. Select Write to Disk from the popup menu.
9. When completed, right click on the CD icon and select Eject.
10. Repeat above procedure for each CD.

1. Download the .iso file for the chosen distribution.
2. Put a blank CD or DVD into the DVD drive.
3. Right-click on the .iso file.
4. Select Open With:
5. If Burn Disc Image appears, select it.
6. Otherwise, select Windows Disk Image Burner.
7. Follow the instruction in the chosen app.
8. When completed, right click on the CD icon and select Eject.
9. Repeat above procedure for each CD.

1. Download the .iso file for the chosen distribution.
2. Put a blank CD or DVD into the DVD drive.
3. From Applications – Utilities, open Disk Utility.
4. From the File menu, choose Open Disk Image
5. Select the .iso file, and then click Burn.
6. When completed, right click on the CD icon and select Eject.
7. Repeat above procedure for each CD.

1. Open a terminal or console.
2. Use the command quota or quota -v to see how much space you have and how much you have exceeded it.
3. Use this command regularly to see how close you are from filling your quota.
4. Use the suggestions below to free space in your account.

• Find Your Disk Usage. Execute the command "cd; du -s .[A-z]* * | sort -n" to show how much disk space each file and directory is using. With this information, you can look for things to remove.
• Remove "core" Files. These files are created when a process exits abnormally and can be safely deleted. Run "find ~/. -name core" to find all core files in your home directory, and run "find ~/. -name core -exec rm {} \;" to remove them.
• Reduce the Firefox Cache.  1. Start Firefox.  2. Select "Preferences" from the "Edit" menu. 3. Click on "Advanced". 4. Click on "Network". 5. Under Cached Web Content click on "Clear Now". You can also do the same with Offline Web Content and User Data 6. You can also reduce the amount of space used for cache by checking the box Override automatic cache management and selecting how much space you want to allow for it.
• Remove Backup Files. If you edit a file named foo.c, emacs will create a backup copy named foo.c~. You can find these files by running "cd; find . -name \*~" and you can remove them with "cd; find . -name \*~ -exec rm {} \;".
• Remove Orphan Files. These files are left when a process is killed unexpectedly. To find them run "cd; find . -name #\*#" To remove them run "cd; find . -name #\*# -exec rm {} \;".
• Compress Files. If you have a file named foo, "gzip foo" will compress the file and replace it with one named "foo.gz". Use "gzip -d foo.gz" to uncompress it and "zcat foo.gz" to view it.

• Insert drive before mounting.
• Mount the usb drive at /mnt/memdrive using the following command
  • mount /mnt/memdrive
• Now you can use regular Linux commands to copy and manipulate files from /mnt/memdrive
• You need to unmount before removing drive. The following commands unmounts the usb or CD drive.
  • umount /mnt/memdrive
  • unmount /MEDIA/CD
• Unmounting the drive and ejecting it.
  • eject /MEDIA/CD

1. Set the permission of your home directory to world executable.The first command moves you to the root of your home directory. The second adds executable to the permission for others.  Don't forget the ~
       Enter: cd
       Enter: chmod o+x ~
2. Add a directory to hold your web pages.
       Enter: mkdir public_html
3. Set the permission of your web page directory to world executable.
       Enter: chmod o+x public_html
4. Copy your web pages to your public_html directory.
       If they are on a floppy disk you can use the mcopy command to copy them to Linux.
5. Your home page file must be named: index.html
6. All files in your public_html directory must be world readable.
       First move to your public_html directory then
       Enter: chmod o+r *
7. Test your new web site.  First start firefox, then
      Enter: www.cs.iusb.edu/~your_login_name

Use the lpr command followed by the printer name and the file to print.  The printers available in our labs are cslp1, cslp2, and cslp3. Currently printing can only be done from one of the lab workstations, so cs01 through cs06 have no access to the printers. The use of printers is restricted the following way:

cslp1 - workstations in NS 207A
cslp2 - workstations in NS 207B
cslp3 - workstations in NS 209

The print command can be used the following way, where the option –P specifies the printer - see above:
lpr -Pcslp1 your-filename-to-print

To cancel printing, enter lpq and the printer name with the –P option. This gives you the job’s queue number. Then enter lprm, the printer name with the –P option, and the job number to remove.