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Linux
A free and open-source family of operating systems first started in 1991 and named after its creator, Linus Torvalds.
2,239 Questions
How do you set the date on a Raspberry Pi?
You can set it by using the "date" command
Syntax is "date MMDDhhmmYY"
Can someone help you install DSL on a 1g flashdrive on your Windows ME?
If your computer has Windows ME on it, it is NOT capable of USB booting. The DSL wiki has detailed instruction on how to make a bootable DSL flash drive. Basically, you need to:
1. Format your Flash drive with a FAT32 file system.
2. Downloaded the embedded DSL zip file and extract it to the Flash drive/
3. Download and install the Windows version of Syslinux
4. Run the Syslinux program on your Flash drive.
BusyBox is a project that aims to provide a number of common Linux utilities (such as grep,ls,who,passwd,head,uname, and so on) in a single binary. This has the advantage of reducing the amount of space needed to store all these functions. As it is smaller than the standard tool package, it is used in ramdisks and in embedded systems where space is an issue.
When pack command is used the original file size is reduced by?
There is no "pack" command in Linux. However, there are numerous compression and archival programs available for use.
"tar" is an archival program. It does no compression, but allows you to put multiple files into one.
"gzip" is a compression program. However, it can only compress one file. Used in conjunction with tar, it is just slightly better than the ".zip" format.
"bzip2" is another compression program with better compression ratios. Like "gzip," it is for compressing single files only. It is usually used in conjunction with "tar."
"zip" and "unzip" are programs for the "ZIP" archive format. It performs both compression and archival.
Answer:I'm not sure if this is an improvement to the above answer or not. As mentioned above, there is no "pack" command in Linux but, in addition to the excellent answer above, a compiled program may be 'stripped' in Linux with the 'strip' command and this will usually serve to reduce the binary file size.The Linux 'strip' command modifies the binary program's symbol tables.
The group has read and execute permissions.
The number is octal; the digits pertain to owner, group and all users respectively. The binary representation in three bits of each digit gives read, write and execute permissions respectively. Thus the middle digit, for group permissions, a 5, is binary 101, indicating read and execute but no write permission.
In linux How can one remove an Xorg window that the window manager is unaware of?
I could not find the answer to this anywhere else, so I came up with the following program.
Note, Answers may reformat the code, so don't blame me for bad formatting! Also, if the output format of xwininfo changes, the program won't work. In this case, you may need to change the number of times that fgets() is called, or change the scanf format.
Also, I have copyrighted this program both to retain credit, and to make sure nobody else copyrights it to keep it from being freely available. You may do anything you like with the program except change or remove the copyright notice or distribute a compiled binary without this source and any changes you have made to it.
/* Copyright (C) 2012 Michael A. Bloom ({my first two initials followed by my last name}@{combine two words as follows: "dsl" followed by the word: extreme} dot com})
You may not change or remove this copyright notice, but except for distributing binaries without this original source and any changes you have made to it, you may otherwise do anything you wish with this code.
*/
#include
#include
/* Chrome leaves unwanted windows around that are left over from popups. */
/* They are not present in the list produced by wmctrl -l. If your */
/* window manager is either metacity or openbox, it is a curious thing */
/* that although restarting either of them does not change anything, */
/* running metacity --replace (if not already running metacity) followed */
/* by openbox --replace, followed by metacity --replace (with three */
/* second sleeps between invocations) gets rid of the unwanted windows. */
/* As it is time consuming to do all that, I came up with this kludge to */
/* get rid of the obscuring windows more quickly. */
/* This is not a great workaround, as after getting rid of these orphan */
/* windows, new ones will continue to appear (once they have started to */
/* do so, they will keep on doing so). But it's better than nothing. */
void exit(int);
char linebuf[BUFSIZ];
main( int argc, char **argv){ FILE *fp;
int i;
Display *dpy = XOpenDisplay(NULL);
int Wid ;
int ret;
printf("Click on UNdesired window\n");
fp = popen("xwininfo","r");
/* Warning: This kludge will break if xwininfo's output format changes */
for (i=0;i< 5;i++){fgets(linebuf,sizeof(linebuf)-1,fp);}
fscanf(fp, "xwininfo: Window id: %i",&Wid);
pclose(fp);
/* Should this be XDestroySubwindows() ? */
ret = XDestroyWindow(dpy,(Window)Wid);
/* printf("%d\n",ret); */
XCloseDisplay(dpy);
exit(0);
}
What is the difference between cron and anacron?
Anacron is the cron for desktops and laptops.
CronAnacronMinimum granularity is minute (i.e Jobs can be scheduled to be executed every minute)Minimum granularity is only in daysCron job can be scheduled by any normal user ( if not restricted by super user )Anacron can be used only by super user ( but there are workarounds to make it usable by normal user )Cron expects system to be running 24 x 7. If a job is scheduled, and system is down during that time, job is not executed.Anacron doesn't expect system to be running 24 x 7. If a job is scheduled, and system is down during that time, it start the jobs when the system comes back up.Ideal for serversIdeal for desktops and laptopsUse cron when a job has to be executed at a particular hour and minuteUse anacron when a job has to be executed irrespective of hour and minute
Can Xubuntu 6.06 run on a 180 Mhz Pentium 1 with 64 MB of RAM?
Yes. However, that's a little on the low side for RAM. Xubuntu runs better on at least 128MB. Less than that will require use of the alternate install CD. It will also likely get stuck while trying to configure "anthy." You can skip this part by pressing Alt-F2, and entering
killall mkworddic
Then press Alt-F1 to go back to the installer.
For performance reasons, you would probably get a lot better speed and responsiveness from a distro with an even lighter interface, such as Damn Small Linux.
The "Sticky bit" in a unix or Linux filesystem was originally designed to tell the OS to keep the program in cache, even after it loaded, so it would "stick" in memory. Although it made it faster to load the program the next time, it also made it difficult to do maintenance on the program, and it wasted memory if the program fell out of common use. For speedy program accesss, modern filesystem caches do a very good job, so the sticky bit is not often used for this any more.
Instead, the sticky bit, when applied to a directory, means: if a user writes a file to this directory, only let that user change that file. It is very common for the /tmp directory to have the sticky bit set. /tmp is a shared resource that every user can write to, so the sticky bit makes sure that users cannot interfere with each other's temp files.
Transferring the file through ssh would keep it secure. There are many options; A few examples are listed below. Run 'man <program name>' for the full program manual.
sftp - secure file transfer program
$ sftp user@host:.bashrc ~/.
rsync - a fast, versatile, remote (and local) file-copying tool
$ rsync user@host:.bashrc ~/.
scp - secure copy (remote file copy program)
$ scp user@host:.bashrc ~/.
~/.ssh/known_hosts
Where is the root password stored in Ubuntu?
The root password is stored in hashed form in the /etc/shadow file.
How many concurrent apache2 instances are normal in Linux?
You can have any number of Apache2 instances between 1 and 200,000 servers. This can be changed at compile-time, though.
How do you enter the Command-line interface?
There are a couple different "terminal" programs, you can either find them in your desktop managers "start" menu or you can press Alt+F2 to bring up the run menu and in KDE enter "konsole" and gnome "gnome-terminal" or you may also have "xterm"
What is the difference between the grep and sed commands in Linux?
The term "grep" stands for "global regular expression parser". It's used to search a character stream for items matching a specific pattern.
The term "sed" stands for "stream editor". It's also capable of searching a character stream for items matching a pattern, but whereas grep just finds them, sed then actually does something to them to change them.
How do you recognize a hidden file in Linux?
It's name begin with a full stop, like .profile or .bash_history
(ls .* or ls -a shows it nevertheless)
What is the difference between passive and active FTP?
A client can ask an FTP server to establish either a PASV (passive-default) or a PORT (active) connection for data transfer. Some servers are limited to only one type of connection. The difference between a passive and an active FTP connection lies in whether the client or server initiates the data connection. In passive mode, the client initiates the connection to the server (port 20-default(; in active mode, the server initiates the connection. Neither is inherently more secure than the other.
A Practical Guide to Fedora and Red Hat Enterprise Linux pg 644-Passive versus active connections
Is there anything on Linux that is similar to Macromedia Flash Pro 8?
Not quite. There's no tools that combines both the ability to create .swf files and the scripting engine in a nice IDE. KToon can create Flash animations and export them as Flash animations, but it lacks any real scripting support. haXe can be used to create Flash content as well, but it uses a different scripting format from ActionScript. There are some other tools available that I'll list below.
If you have a copy of Macromedia Flash pro 8 already, however, it runs well under Wine.
Link Counts In linux
there are basically two types
1.soft links
2.hard links
#!/bin/bash
useradd username
usermod username usergroup
RTFM is an abbreviation standing for "Read The F**king Manual." It is often used by impolite users in a response to a question from a newbie, when the answer could probably have been found by simply reading the accompanying documentation.
