What is the difference between commands git add * and git add . when I put parameters * and . accordingly? What list of files system returns in both cases?
I am trying to enable SSH in my Ubuntu running in WSL2 system:
sudo systemctl status ssh
I get this error:
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
What does it mean and how can I enable ssh?
I'm trying to install docker on my Ubuntu 20.04. Trying install docker with apt-get and snap:
sudo apt-get install docker
Output:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
wmdocker
The following NEW packages will be installed:
docker wmdocker
0 upgraded, 2 newly installed, 0 to remove and 6 not upgraded.
Need to get 0 B/14.3 kB of archives.
After this operation, 58.4 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Selecting previously unselected package wmdocker.
(Reading database ... 193518 files and directories currently installed.)
Preparing to unpack .../wmdocker_1.5-2_amd64.deb ...
Unpacking wmdocker (1.5-2) ...
Selecting previously unselected package docker.
Preparing to unpack .../archives/docker_1.5-2_all.deb ...
Unpacking docker (1.5-2) ...
Setting up wmdocker (1.5-2) ...
Setting up docker (1.5-2) ...
Processing triggers for man-db (2.9.1-1) ...
If I run docker command I get error:
a@ubuntu:~$ docker
Command 'docker' not found, but can be installed with:
sudo snap install docker # version 19.03.11, or
sudo apt install docker.io # version 19.03.8-0ubuntu1.20.04.1
See 'snap info docker' for additional versions.
Why system can't find docker command?
Then I tied snap:
sudo snap install docker
And docker command run fine.
Why I can install docker with snap and can't with apt-get ?
I have a startup script line:
pyprogramm >> /dev/null 2>&1 &
Meanings:
>> /dev/null - redirect stdout to null device
2>&1 - redirect stderr to stdout (that is redirected to null device)
but what does the very last & mean?
I have /usr/lib32/libstdc++.so.6 library on my Ubuntu system. I would like to know which package brought it there. How to know that?
The man command brings up a nice manual for many programs, but how can I use it more effectively? For example man gcc brings:
NAME
gcc - GNU project C and C++ compiler
SYNOPSIS
gcc [-c|-S|-E] [-std=standard]
[-g] [-pg] [-Olevel]
[-Wwarn...] [-Wpedantic]
[-Idir...] [-Ldir...]
[-Dmacro[=defn]...] [-Umacro]
[-foption...] [-mmachine-option...]
[-o outfile] [@file] infile...
Only the most useful options are listed here; see below for the
remainder. g++ accepts mostly the same options as gcc.
....
many text
But what if I need only some part of it? What is the best way to jump to the section where -Idir is described, for example?
I'm trying to understand what the many selections in the GRUB menu are.
- recovery mode - self-explanatory, fine
What is 4.10.0.-42 and 4.10.0.-28 ? Is this somehow related to versions of something?
upstart- what it is used for?
I have installed Oracle Java on my Ubuntu 16.04. I tried making a hard link:
ln /usr/local/jdk-9.0.1/bin/java /usr/bin/java
When I ran java I got this error:
java: error while loading shared libraries: libjli.so: cannot open shared object file: No such file or directory
I removed the hard link and made a soft link instead:
ln -s /usr/local/jdk-9.0.1/bin/java /usr/bin/java
That solves the problem. So why does the soft link work while the hard one failed?
I run my Ubuntu in a VMWare virtual machine that is hosted by Win10. Vmware tools is installed.
I can't copy from notepad in Windows and paste into Ubuntu applications. Vice versa works fine. The virtual machine settings for copy/paste - enabled:
How to enable copy from Windows 10 and paste to Ubuntu.
I run Ubuntu 16.04 on Vmware box version 12.5.2. Trying to install Vamware tools using these commands:
VM->Install vmware tools
copy whole VMWare Tools directory to ~
run sudo ./run_upgrade.sh
But nothing is happening and no error messages appear? How can I install vmware tools in the correct way?
Sometimes I have hanged NetBeans on my Ubuntu system. How to kill it?
aux |grep [n]etbeans
gives too much id's in order to find correct one.
killall java
kills other java applications, but not NetBeans.
How to kill NetBeans 8.2 ?
I need to kill a process that contains myName in its description. Currently I'm doing:
ps -ax |grep myName
I see PID
kill -9 PID
How can I do the same with one command without entering the PID?
I have many remote machines I need to log in. I need somehow store connection parameters because it is too boring enter them manually. Also I prefer to store password in these shortcuts. Software similar MTPuTTY that runs under windows would would solve my problem in Ubuntu.
How to solve this problem?
I run command to search for phrase in all files:
cat *.* | grep blabla
It works fine but I got problem with hidden files and directories. Command simply not deals with them. Ho to solve this problem?
In Vim,
:%!ls
executes ls command and prints its output to the current editable file.
But what do % and ! mean separately in vim?
Is it possible execute ls and not put its output to document?
Trying to connect to SSH server using Ubuntu file explorer. I have already connected to that server using SFTP, but now I would like to do the same via SSH.
By entering address and pressing connect because of unknown reason it connects to recent connection via SFTP. Why not SSH? How to fix it?
Suddenly copy/paste stopped working from/to Windows 8 host computer to/from ubuntu virtual machine. Ubuntu restart did not help. I tried command:
sudo apt-get install open-vm-tools
But got report I have newest version. Guest Isolation settings are enabled. What could be the scenario of fixing this problem?
After I have performed one of sudo apt-get install eclipse eclipse-cdt g++ procedure I found that Ubuntu is planning to download more than 400Mb and it will take more than 2 hours. It is too long. I also found that it downloads from the US:
Get:21 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main libservlet3.0-java
all 7.0.52-1ubuntu0.3 [294 kB]
I'm in Europe, maybe should I somehow tell Ubuntu to download from a source located closer. How should I do that?
I am trying to copy a piece of text to the system clipboard. First, I do a visual selection: select " then + then y.
I then get a message 7 lines yanked. When I press p, the data is pasted in vim; but, when I'm trying to paste data to any other program - no result. How do I solve this problem?
In Ubuntu manual regarding AutomaticallyMountPartitions is described that Nautilus is using udisks to mount partitions. But when I type udisks in terminal system tells that I need to install it. So, do Nautilus really uses udisks?
"When you mount a disc normally with the file browser (nautilus etc) it mounts disks by interacting with udisks behind the scenes."