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Full Discussion: Help-----ibm Aix???
Operating Systems AIX Help-----ibm Aix??? Post 52563 by solaris8in on Tuesday 22nd of June 2004 08:05:05 AM
Old 06-22-2004

if u get something intresting abt aix tel me also
Test Your Knowledge in Computers #416
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JavaScript supports event-driven, functional, and imperative (including object-oriented and prototype-based) programming styles.
True or False?

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INTRO(1)							Linux User's Manual							  INTRO(1)

intro - introduction to user commands DESCRIPTION
Section 1 of the manual describes user commands and tools, for example, file manipulation tools, shells, compilers, web browsers, file and image viewers and editors, and so on. NOTES
Linux is a flavor of UNIX, and as a first approximation all user commands under UNIX work precisely the same under Linux (and FreeBSD and lots of other UNIX-like systems). Under Linux, there are GUIs (graphical user interfaces), where you can point and click and drag, and hopefully get work done without first reading lots of documentation. The traditional UNIX environment is a CLI (command line interface), where you type commands to tell the computer what to do. That is faster and more powerful, but requires finding out what the commands are. Below a bare minimum, to get started. Login In order to start working, you probably first have to open a session by giving your username and password. The program login(1) now starts a shell (command interpreter) for you. In case of a graphical login, you get a screen with menus or icons and a mouse click will start a shell in a window. See also xterm(1). The shell One types commands to the shell, the command interpreter. It is not built-in, but is just a program and you can change your shell. Every- body has her own favorite one. The standard one is called sh. See also ash(1), bash(1), chsh(1), csh(1), dash(1), ksh(1), zsh(1). A session might go like: knuth login: aeb Password: ******** $ date Tue Aug 6 23:50:44 CEST 2002 $ cal August 2002 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 $ ls bin tel $ ls -l total 2 drwxrwxr-x 2 aeb 1024 Aug 6 23:51 bin -rw-rw-r-- 1 aeb 37 Aug 6 23:52 tel $ cat tel maja 0501-1136285 peter 0136-7399214 $ cp tel tel2 $ ls -l total 3 drwxr-xr-x 2 aeb 1024 Aug 6 23:51 bin -rw-r--r-- 1 aeb 37 Aug 6 23:52 tel -rw-r--r-- 1 aeb 37 Aug 6 23:53 tel2 $ mv tel tel1 $ ls -l total 3 drwxr-xr-x 2 aeb 1024 Aug 6 23:51 bin -rw-r--r-- 1 aeb 37 Aug 6 23:52 tel1 -rw-r--r-- 1 aeb 37 Aug 6 23:53 tel2 $ diff tel1 tel2 $ rm tel1 $ grep maja tel2 maja 0501-1136285 $ Here typing Control-D ended the session. The $ here was the command prompt--it is the shell's way of indicating that it is ready for the next command. The prompt can be customized in lots of ways, and one might include stuff like username, machine name, current directory, time, and so on. An assignment PS1="What next, master? " would change the prompt as indicated. We see that there are commands date (that gives date and time), and cal (that gives a calendar). The command ls lists the contents of the current directory--it tells you what files you have. With a -l option it gives a long listing, that includes the owner and size and date of the file, and the permissions people have for reading and/or changing the file. For example, the file "tel" here is 37 bytes long, owned by aeb and the owner can read and write it, others can only read it. Owner and permissions can be changed by the commands chown and chmod. The command cat will show the contents of a file. (The name is from "concatenate and print": all files given as parameters are concate- nated and sent to "standard output" (see stdout(3)), here the terminal screen.) The command cp (from "copy") will copy a file. The command mv (from "move"), on the other hand, only renames it. The command diff lists the differences between two files. Here there was no output because there were no differences. The command rm (from "remove") deletes the file, and be careful! it is gone. No wastepaper basket or anything. Deleted means lost. The command grep (from "g/re/p") finds occurrences of a string in one or more files. Here it finds Maja's telephone number. Pathnames and the current directory Files live in a large tree, the file hierarchy. Each has a pathname describing the path from the root of the tree (which is called /) to the file. For example, such a full pathname might be /home/aeb/tel. Always using full pathnames would be inconvenient, and the name of a file in the current directory may be abbreviated by giving only the last component. That is why /home/aeb/tel can be abbreviated to tel when the current directory is /home/aeb. The command pwd prints the current directory. The command cd changes the current directory. Try alternatively cd and pwd commands and explore cd usage: "cd", "cd .", "cd ..", "cd /" and "cd ~". Directories The command mkdir makes a new directory. The command rmdir removes a directory if it is empty, and complains otherwise. The command find (with a rather baroque syntax) will find files with given name or other properties. For example, "find . -name tel" would find the file tel starting in the present directory (which is called .). And "find / -name tel" would do the same, but starting at the root of the tree. Large searches on a multi-GB disk will be time-consuming, and it may be better to use locate(1). Disks and filesystems The command mount will attach the filesystem found on some disk (or floppy, or CDROM or so) to the big filesystem hierarchy. And umount detaches it again. The command df will tell you how much of your disk is still free. Processes On a UNIX system many user and system processes run simultaneously. The one you are talking to runs in the foreground, the others in the background. The command ps will show you which processes are active and what numbers these processes have. The command kill allows you to get rid of them. Without option this is a friendly request: please go away. And "kill -9" followed by the number of the process is an immediate kill. Foreground processes can often be killed by typing Control-C. Getting information There are thousands of commands, each with many options. Traditionally commands are documented on man pages, (like this one), so that the command "man kill" will document the use of the command "kill" (and "man man" document the command "man"). The program man sends the text through some pager, usually less. Hit the space bar to get the next page, hit q to quit. In documentation it is customary to refer to man pages by giving the name and section number, as in man(1). Man pages are terse, and allow you to find quickly some forgotten detail. For newcomers an introductory text with more examples and explanations is useful. A lot of GNU/FSF software is provided with info files. Type "info info" for an introduction on the use of the program info. Special topics are often treated in HOWTOs. Look in /usr/share/doc/howto/en and use a browser if you find HTML files there. SEE ALSO
ash(1), bash(1), chsh(1), csh(1), dash(1), ksh(1), locate(1), login(1), man(1), xterm(1), zsh(1), wait(2), stdout(3), man-pages(7), stan- dards(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at Linux 2015-07-23 INTRO(1)

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