Week Eight Agenda Announcements Link of the week Review week seven lab assignment This week’s expected outcomes Next lab assignment Upcoming deadlines Lab assistance, questions and answers

Link of the week A Sys Admin's Unixersal Translator (ROSETTA STONE) OR What do they call that in this world? Tasks OSs Adm. GUIAIX File SystemA/UX KernelFreeBSD Start up scriptsHP-UX Create a file systemLinux Mount CDROMNCR Unix Add softwareOpen BSD

Link of the week Open Source Projects Lab Assignment 13-1 is due April 8 (100 points) Requirements: APA Style format Cover sheet Three sheets of typed information Reference page

Link of the week Lab Assignment 13-1 Public Domain/Open Software Evaluation No two presentations shall be the same. Lab assignment grade components. Paper: 0 – 75 points Presentation 0 – 25 points Presentation date: April 2

Week Seven Question How can the inode attributes be displayed? There is a good deal of information about individual files on a UNIX system. One way to display this information is through a Perl script. The Perl stat command is used to access thirteen pieces of information about a file through a script. ($dev, $ino, $mode, $nlink, $uid, $gid, $rdev, $size, $atime, $mtime, $ctime, $blksize, $blocks) = stat ( $fileattributes);

Week Seven Question dev – device number of the filesystem (0) ino – inode number (1) mode – file mode (permissions) (2) nlink – number hard links (3) uid – user ID of file’s owner (4) gid – group ID of file’s owner (5) rdev – device identifier (6) size – total size of file (7) atime – last access time in seconds since epoch (8) mtime – last modified time in seconds since epoch (9) ctime – inode change time in seconds since epoch (10) blksize – block size for file syatem (I/O) (11) blocks – actual number of blocks allocated (12)

Week Seven Question Single file attribute (permissions): $mode=(stat($fileattributes))[2]; Single file attribute (date) and ($fileattrabutes); print “$date[4]\n”; Perl module : use File::stat

Review week seven lab assignment Define: Data structure is where information is stored/collected in one place. The stored information may or may not be related. Data structures are unique in their construction so as to deliver a specific usage. Commonly data structures are arrays, hash tables, stacks, and queues.

Review week seven lab assignment inode The inode data structure file mode – file permissions (rwx) count of hard links – how many hard links point to the inode file type – executable, block special owner id group id time of last file access - timestamp time of last file modification - timestamp file size - bytes file addresses – addresses of the blocks of storage containing the files data on a HDD

Review week seven lab assignment

The directory maps file names to inodes. Each file has one inode. The number of inodes is a kernel parameter value set manually or dynamically by the operating system. Each file may have more than one directory entry. Inodes contain a list of disk block addresses. All inodes are data structures

Review week seven lab assignment

When there are multiple hard links, more directory entries point to the same inode (same file name) An inode can only hold a fixed number of direct data block addresses (10 for Linux). Large files use indirect block addresses. The inode keeps a count of the number of hard links that point to it. Deleting a file deletes and entry from a directory. If the number of hard links is 1, removing or deleting that file will also delete the inode.

Review week seven lab assignment

Define: A symbolic link is a link to a directory or to a file in a different file system. A symbolic path indicating the abstract location of another file. ln –s lrwxrwxrwx 1 root root 10 Jun rc0.d -> rc.d/rc0.d lrwxrwxrwx 1 root root 10 Jun rc1.d -> rc.d/rc1.d Define: A physical link (hard) refers to the specific location of physical data. ln prog1 prog2 -rwx varneyg faculty 318 Jun 14 21:03 prog1 -rwx varneyg faculty 318 Jun 14 21:03 prog2

Review week seven lab assignment Define: tar tar –cf newpack.tar /export/home/varneyg tar –xvf origpack.tar tar –tvf origpack.tar Define: gzip gzip filename.tar gzip –d filename.tar.gz gunzip filename.tar.gz Define: bzip2/bunzip2ip bzip2 filename.tar bunzip2 filename.tar.bx2

Review week seven lab assignment Installing the software package Package Usually, the source files are packaged in a compressed archive file (.tar.gz). After downloading, the.tar.gz file, use the tar tool to uncompress the un-package the source files.

Review week seven lab assignment Definition: Installation (computer programs) Installation process: - Condensed package - Unpack package - Customized package - Test the functionality of the system - Configure files

Review week seven lab assignment Two choices for installing a project 1. Install binaries from a package called “rpm” in Red Hat. rpm checks for dependencies and conflicts with other installed packages on the system. 2. Install from source code Allows for custom installations Allows for code modifications Optimum compilation for target platform

Review week seven lab assignment rpm is a tool rpm –q sloccount (query to see if tool exists) If the tool isn’t on your system, create a directory named sloccount Download name sloccount i386.rpm rpm –vUh sloccount i386.rpm (install tool) See the man page regarding the rpm tool

Review week seven lab assignment QUERYING AND VERIFYING PACKAGES: rpm {-q|--query} [select-options] [query-options] rpm {-V|--verify} [select-options] [verify-options] rpm --import PUBKEY... rpm {-K|--checksig} [--nosignature] [--nodigest] PACKAGE_FILE... INSTALLING, UPGRADING, AND REMOVING PACKAGES: rpm {-i|--install} [install-options] PACKAGE_FILE... rpm {-U|--upgrade} [install-options] PACKAGE_FILE... rpm {-F|--freshen} [install-options] PACKAGE_FILE... rpm {-e|--erase} [--allmatches] [--nodeps] [--noscripts] [--notriggers] [--repackage] [--test] PACKAGE_NAME...

Review week seven lab assignment Software Installation of UNIX/Linux typically goes something like this: 1.Download the software, which might be distributed in source code format, or as a binary. 2.Unpack the software from its distribution format (typically a tarball compressed with compress, gzip, or bzip2 3.Locate the documentation (perhaps an INSTALL or README file, or some files in a doc/ subdirectory) and read up on how to install the software. 4.If the software was distributed in source format, compile it. This may involve editing a makefile, or running a configure script, and other work. 5.Test and install the software.

Review week seven lab assignment Kernel is the central component of most operating systems. It’s responsibility is to manage the system’s resources and communicate between the hardware and software. Kernel space is allocated for the kernel. Users aren’t able to access this area. Kernel space is generally larger than user space. User space is a memory area where all user mode applications are performed. This memory area is swappable if necessary.

Review week seven lab assignment Turnable Parameters Unix/Linux kernel semmni, semmns, and semmsl reflect the number of semaphores per set/Cache uses shmmax, shmmni, shmseg, and shmall reflect shared memory allocation maxusers, pt_cnt, use_mxcc_prefetch Example of semaphore. train track

Review week seven lab assignment File Systems (CDFS, MEMFS, NAMEFS, NFS, SFS, S5, UFS, VXFS) Buffer cache Amount of memory used to transfer a file system data structure such as inodes, direct blocks, indirect blocks, and cylinder groups.

Review week seven lab assignment Software releases Interfaces – normally remain the constant. Implementations – actual fixes Behaviors – system changes from one implementation to another

Week eighth expected outcomes Upon successful completion of this module, the student will be able to: Create make file scripts for software programs. Use pattern rules in make files. Create an effective PowerPoint presentation. Create make files with multiple targets. Install software packages on a server.

Next Lab Assignment fsck fsck is used to check and optionally repair one or more Linux file systems. If no filesystems are specified on the command line, and the -A option is not specified, fsck will default to checking filesystems in /etc/fstab serial. fsck -A Walks through the /etc/fstab file and tries to check all file systems in one run. This option is typically used from the /etc/rc system initialization file, instead of multiple commands for checking a single file system.

Next Lab Assignment The exit code returned by fsck is the sum of the following conditions: 0 - No errors 1 - File system errors corrected 2 - System should be rebooted 4 - File system errors left uncorrected 8 - Operational error 16 - Usage or syntax error 32 - fsck canceled by user request Shared library error

Next Lab Assignment /etc/fstab /dev/mapper/vg_system-root / ext4 defaults 1 1 UUID=5a9e44d d9d-bf16-a1b6cf48ff9e /boot ext4 defaults 1 2 /dev/mapper/vg_system-home /home ext4 defaults 1 2 /dev/mapper/vg_system-tmp /tmp ext4 defaults 1 2 /dev/mapper/vg_system-usr /usr ext4 defaults 1 2 /dev/mapper/vg_system-var /var ext4 defaults 1 2 /dev/mapper/vg_system-swap swap swap default 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode= sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 dc2prst001.students.qw.franklin.edu:/vol/dc2_einstein_home/home /home nfs defaults 0 0

Next Lab Assignment The Installation Exercise is an exercise that requires following directions. Perform each step in the prescribed sequence and syntax. Create an ASCII file named 4 th _log.txt Create the following directory /$HOME/itec400/homework/4 th Download the programming language “forth” Copy compressed “tar” file to your 4 th directory cd /$HOME/itec400/homework/4 th cp ~varneyg/public_html/itec400/Misc/4th-3.3d2-unix.tar.gz. The expected output is an executable file called “4 th ”.

Next Lab Assignment Grading Criteria The size of the file “readme.txt” is recorded in “4th_log.txt” : 0 – 15 points The prerequisites for the target ‘4th’ are recorded in “4th_log.txt”: 0 – 15 points The size of the executable named “4th”, in bytes, is recorded in “4th_log.txt”: 0 – 20 points

Upcoming deadlines Programming Assignment 1, 6-1 is due Feb. 26. Installation Exercise, 8-1 is due March 4. Startup/Shutdown, 9-1 is due March 11. Account/LDAP Script, 10-1 is due March 18. Process Exercise, 10-2 is due March 18. Demonstrate Power Point Presentation ejava.ppt

Questions and answers Questions Comments Concerns I am available after this Franklin Live session to discuss any problems and/or concerns regarding the lab assignments