Since 5.10 kernel there is a new feature called fast_commit. In arch wiki https://wiki.archlinux.org/title/ext4 you can read that it can be enabled in existing filesystem with:
tune2fs -O fast_commit /dev/drivepartition
but in https://lwn.net/Articles/842385/ there is:
Fast commits are activated at filesystem creation time, so users will have to recreate their filesystems to use this feature.
So is tune2fs -O fast_commit truly enable this feature in existing filesystem ?
There is a BAN chain with this rule:
-A BAN -m recent --name ping --rcheck --seconds 5 --hitcount 3 --rsource -j RETURN
it will match when there will be 2 pings in 5 seconds but if i add remove addresses from ping list which didn't match this upper rule will never match why ?
-A BAN -m recent --name ping --remove
lxc list gives a list of containers. When there are a lot of them it is hard to remember what are they for. Is there any solution to add description to this list ? eg. "this machine is for apache and mysql"
file:
string1 string2 string3 string4 string5 string6
string3 string1 string2 string4 string5 string6
string6 string3 string2 string4 string1 string5
expectation:
string2 string3 string4 string5
string2 string4 string5
string2 string4 string1 string5
Match pattern=string1
How to print match lines but only from string2 to string5 with awk ?
Unfortunately this is not processing in line :
awk '/string2/,/string5/' file
Let's assume there are few long lines with string2 and string5 in different places.
hdparm -I /dev/sda output:
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
stat somefile output:
Size: 509 Blocks: 8 IO Block: 4096 regular file
Why IO Block is 4096 ? Isn't it the same as physical sector size which is 512 bytes ?
Every few shutdowns a core dump file is created on /. How can I prevent creating core dumps completely?
gdb --core=/core output:
Core was generated by /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -noliste'.
Program terminated with signal SIGSEGV, Segmentation fault.
I added these parameters to my configuration files:
to /etc/security/limits.conf:
* hard core 0
root hard core 0
to /etc/sysctl.d/60-own.conf:
fs.suid_dumpable=0`
to /etc/systemd/system.conf:
DumpCore=no
Core dump files still exist (in 16.04.1).
echo ${string##*.} # this will show everything after last "."
How can i revert (negate) this - show everything before last "."
Is it possible to a add rule description in ufw or iptables, in order to avoid future questions like: "Why did you block this IP?"
When adding user like this :
sudo adduser someuser --ingroup sudo
Added user can use sudo but he is not in /etc/group sudo nor in /etc/sudoers
So how does it work ?
When I hold down an ASCII key on the keyboard, it will repeat.
However, if I hold down the volume function key, it will not repeatedly increment the volume.
How can I fix this? (Ubuntu 16.04 64bit)
On original /boot/initrd.img-kernel_ver binwalk shows this structure:
From 0 to 22528 bytes there is CPIO archive contains only GenuineIntel.bin firmware in specific folder hierarchy.
From 22528 bytes there is gzip archiwe contains appropriate file system and this gzip is also archived with CPIO
After unpacking and modifying how can I compress initrd.img in the same way (with the same folder hierarchy) ? like this original structure:
After suggestion from comment :
find . | cpio --quiet --dereference -o -H newc | lzma -7 > ../cusotm.initrd.lz
binwalk :
This is completly different structure.
Is there a functionality of gnome-calendar (in Xenial) to sending notifications on events like notify-send style ?
How can I use /lib/systemd/system-shutdown/ folder for executing some action on shutdown or reboot in Ubuntu 15.10 ?
#!/bin/bash
case $1 in
reboot|poweroff)
some command ;;
esac
This supposed to work (/lib/systemd/system-sleep/ is working in this way) but it is not why ?
How to prevent ureadahead from trying to read
non-existent logs from home folder.
journalctl -u ureadahead.service give errors like these below:
ureadahead:/home/$USER/.cache/upstart/gnome-keyring.log: There is no such file or folder ureadahead:/home/$USER/.cache/upstart/gnome-keyring-ssh.log: There is no such file or folder ureadahead:/home/$USER/.cache/upstart/dbus.log: There is no such file or folder and more ...
Deleting /var/lib/ureadahead/pack file/s (in order to rebuilding database) has no effect.
Ubuntu 15.10, ureadahead 0.100.0-19
I accidentally changed permission to 000 on symlink:
/lib64/ld-linux-x86-64.so.2
In effect ubuntu 15.10 can't execute any bash command (binary). In this situation chroot from live cd is not working. System is not launching (kernel panic). Rescue mode also is not launching. How to (restore permissions of this symlink and) make system bootable?
How to sort files in numerical order eg:
01abc.mp3
02abc.mp3
03abc.mp3
With minidlna files are sort by names, digits are ignored.
How can I enable html5 hw acceleration in firefox 38 ? (running on ubuntu 15.04) with vaapi via gstreamer1.0-vaapi (installed). I have intel hd 4600.
In ubuntu 14.04 I have just compiled lm-sensors ver. 3.3.5 and install it using dpkg -i, after that when running apt-get update, apt want to downgrade it to older (repository) version. How to resolve this ?
I am wondering why not all scripts placed in init.d folder are in rc folders eg. system cups is in init.d but there is not in rc folders?
I don’t know if I understand it right. When I want to disable service I have to execute
update-rc.d -f something remove
but do I have to delete this service file from init.d folder too ? because when I check
service --status-all
after update-rc.d -f something remove this service is still present in the list. How to interpret it right ?