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wget not working on my debian server from now:
wget http://anydomain.hu/anyimage.png
/usr/local/bin/wget: 3: /usr/local/bin/wget: Cannot fork
running "top" command:
Tasks: 89 total, 1 running, 88 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1,0 us, 0,0 sy, 0,0 ni, 99,0 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 1017080 total, 64316 used, 952764 free, 2264 buffers
KiB Swap: 1675260 total, 42488 used, 1632772 free, 22564 cached
i don't know what's the problem pls help me
Have you tried to reinstall wget? If not try apt-get install --reinstall wget
and try again to download anything.
The wget command is normally in /usr/bin. Since yours is in /usr/local/bin, it appears you've installed a different command with the same name.
And given that the error message appears to include a line number, I'm guessing that your /usr/local/bin/wget is a shell script that's intended to be a wrapper around the standard wget command.
For example, if you had something like:
#!/bin/bash
wget -q "$#"
because you want to turn off wget's output, then your script will invoke itself recursively. After some number of iterations it will be unable to fork a new process, and it will terminate.
If so, changing the script to invoke /usr/bin/wget explicitly should fix it.
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when I use docker run -itd mysql,then to use ps -elf check the process infomation with "4 S systemd+ 257584 257561 1 80 0 - 712611 poll_s Jul17 ? 00:40:16 mysqld".
root#xx:/proc/257584/ns# ps -elf | grep mysqld
4 S systemd+ 257584 257561 1 80 0 - 712611 poll_s Jul17 ? 00:40:20 mysqld
root#xx:/proc/257584/ns# ps -el | grep mysqld
4 S 999 257584 257561 1 80 0 - 712611 poll_s ? 00:40:21 mysqld
But I use "cat /cat/passwd" can't find username equal to "systemd+".
docker Version: 20.10.12
os ubuntu20.04
ps (sadly) trims the username to 8 (if i'm counting right) characters and adds a + after the user name initial part. The username could be systemd-mysql or systemd-something that you can find in passwd.
From manual:
If the length of the username is greater than the length of the display column, the username will be truncated. See the -o and -O formatting options to customize length
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First of all, Here is my environment of system:
# cat /proc/version
Linux version 4.15.0-52-generic (buildd#lgw01-amd64-051) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #56-Ubuntu SMP Tue Jun 4 22:49:08 UTC 2019
# cat /etc/issue
Ubuntu 18.04.2 LTS \n \l
Refer to this Ubuntu Wiki, ubuntu has used Systemd by default since 15.04 and Systemd runs with PID 1 as /sbin/init. However, I found the different result on my ubuntu 18.04:
# ps aux | awk '$2==1{print $0}'
root 1 0.0 0.8 159692 8784 ? Ss Oct24 0:21 /sbin/init noibrs splash
# lsof -p 1 | grep txt
systemd 1 root txt REG 252,1 1595792 927033 /lib/systemd/systemd
So, my question is that:
Why Ubuntu 18.04 use /sbin/init instead of /lib/systemd/systemd?
Why lsof -p 1 | grep txt return /lib/systemd/systemd while the process of PID 1 is /sbin/init?
/sbin/init is a symbolic link to /lib/systemd/systemd
Take a look at the output of stat /sbin/init or readlink /sbin/init
This is what they mean by systemd "running as /sbin/init". The systemd binary is linked as /sbin/init and started by that link name.
Update
To further explain the difference between the ps and lsof output: ps is showing the command that started the process, while lsof is showing which files a process has opened.
When systemd was started, it was called by /sbin/init noibrs splash, the file system resolved the link to the file /lib/systemd/systemd which was then read from disk and executed.
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I'm not sure why there is not an option in the top command that does this, as it seems to be a natural request.
If I pipe the output of top to head, then the list doesn't update and I get static output once. I could then bring the watch command into action, which would do the job. But, is there a simpler solution?
I use a trick, specially for batch mode. I pipeline the exit to grep, with option "-A", to show N lines after match.
As in the first line of top there is something like: "load average", I grep that, for instance:
$ top -d 5 -b|grep "load average" -A 15
top - 09:42:34 up 38 min, 1 user, load average: 0.22, 0.39, 0.53
Tasks: 294 total, 2 running, 291 sleeping, 0 stopped, 1 zombie
%Cpu(s): 3.5 us, 0.9 sy, 0.0 ni, 94.6 id, 0.5 wa, 0.3 hi, 0.1 si, 0.0 st
KiB Mem : 8065144 total, 2213800 free, 2733524 used, 3117820 buff/cache
KiB Swap: 24575996 total, 24575996 free, 0 used. 4613128 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2744 lrojas 20 0 3376820 752000 116588 R 20.2 9.3 9:30.01 firefox
1869 lrojas 9 -11 566164 18336 14300 S 5.2 0.2 2:35.78 pulseaudio
2401 lrojas 20 0 740092 200456 87256 S 2.4 2.5 0:57.29 skype
2402 lrojas 20 0 617872 172924 76172 S 2.2 2.1 0:57.17 skype
1333 root 20 0 459028 60992 48024 S 1.6 0.8 0:36.14 Xorg
1838 lrojas 20 0 2103336 184468 64724 S 1.4 2.3 0:56.85 gnome-shell
2359 lrojas 20 0 741212 35068 24620 S 1.4 0.4 0:06.83 gnome-terminal-
2404 lrojas 20 0 1867556 229912 83988 S 0.8 2.9 0:19.63 thunderbird
1249 apache 20 0 461436 10196 3404 S 0.4 0.1 0:00.57 httpd
This way it will continue in batch mode, always showing only the first N lines of output.
Completely standard solution, for any version of top.
> top
then, press n to set maximum tasks displayed.
When operating top, one of the most important key is help (h or ?) to see the available options (n is given in help).
UPDATE (after the the comment):
PERSONAL Configuration File might help for the batch mode. Run top then set the maximum tasks displayed with n and use the W interactive command to create or update the configuration file. top will be ran according to the configuration file next time.
Perhaps you should add the -b parameter which runs top in the batch mode: watch -n 5 'top -b -d 5 | head -n 10'
You can make config file for top (for example: run top command in interactive mode, then press "n" and write limit for number of processes, then press "W" to save this in your configuration file).
In the next step, you can run top in batch mode; parameter in config file limits output to requested value. So, then simple:
top -b > top.log
will be enough.
The solution for MAC is :
top -a -n20 | awk 'FNR>=11 && FNR<=31{print $0};FNR==31{exit}' > cpustat.txt
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There are a lot of posts to show to create a virtual floppy image file as a super user or users can run sudo command. The basic steps are:
create empty 1.44MB image file by dd command
format the image file by mkfs.msdos
mount the image file to some mount point
copy something to the mount point
umount the virtual floppy image file
my question is, in case I am just a common user who cannot run sudo command, how can I follow above steps to create a virtual floppy image and write something in it?
Thanks a lot.
Yes, of course you can do this. Use mtools for the FAT and e2tools or genext2fs for the ext2 filesystems.
$ dd if=/dev/zero of=/tmp/disk1.img count=1440 bs=1k
1440+0 records in
1440+0 records out
1474560 bytes (1.5 MB) copied, 0.00569719 s, 259 MB/s
$ /sbin/mkfs.msdos /tmp/disk1.img
mkfs.msdos 3.0.12 (29 Oct 2011)
$ mdir -i /tmp/disk1.img
Volume in drive : has no label
Volume Serial Number is 9913-BFF6
Directory for ::/
No files
1 457 664 bytes free
$ mcopy -i /tmp/disk1.img /etc/issue.net ::/
$ mdir -i /tmp/disk1.img
Volume in drive : has no label
Volume Serial Number is 9913-BFF6
Directory for ::/
issue net 28 2012-06-26 10:49
1 file 28 bytes
1 457 152 bytes free
And of course, I have no root rights.
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What is equivalent of Linux's 'free' command on FreeBSD v8.1?
I am calling 'free' from my application and reporting the results in my application's log file. What would be the replacement when porting to FreeBSD v8.1?
Here is a sample run of 'free' on Linux:
[centos4x32 ~] free
total used free shared buffers cached
Mem: 774452 733044 41408 0 98040 328880
-/+ buffers/cache: 306124 468328
Swap: 2031608 224 2031384
vmstat has default output which is similar in nature and takes many options that give extremely detailed information, eg vmstat -m
swapinfo would cover the swap part
top -d1 causes top to print one screen and exit, and the banner is very similar to free. Use top -d1 | head -n 7 to see only the banner
Maybe freecolor command is a choice. Install it:
# cd /usr/ports/sysutils/freecolor
# make install clean
Use it:
# freecolor
Physical : [#################################..] 94% (1907820/2018396)
Swap : [###################################] 100% (1048540/1048540)
# freecolor -m -o
total used free shared buffers cached
Mem: 1971 107 1863 0 0 0
Swap: 1023 0 1023
Please refer FreeBSD find out RAM size Including Total Amount of Free and Used Memory Size.
vmstat -s gives some more human-readable or script-parseable information, including listing the page size. Otherwise, it gives output in numbef of pages. With no options, vmstat gives a brief summary.
The vmstat command also exists on NetBSD.
just use old good htop
install htop
pkg install htop
to run
htop
Other option:
# vmstat fre
procs memory page faults cpu
r b w avm fre flt re pi po fr sr in sy cs us sy id
0 0 0 13475M 24M 689 1 2 0 344 394 14693 37734 60809 7 43 50
You can use this script.
# fetch http://www.cyberciti.biz/files/scripts/freebsd-memory.pl.txt
# mv freebsd-memory.pl.txt /usr/local/bin/free
# chmod +x /usr/local/bin/free
source: http://www.cyberciti.biz/faq/freebsd-command-to-get-ram-information/