I need to make a folder with name ./public/sop behave like it is ./public.
I tried ln -s ./public/ ./public/sop and there were no errors. But it doesn't work. ls ./public/sop does not show the other files/folders in the ./public folder. It shows just one line:
lrwxrwxrwx 1 pi pi 9 Nov 20 13:06 public/sop -> ./public/
And an attempt to ls ./public/sop/test.txt, where test.txt is an existing file in ./public, returns No such file or directory.
How can I achieve what I need?
*/15 * * * * works fine by running every 15 minutes starting from the top of the hour.
I need a task to run every 15 minutes starting from 5 minutes past the hour. Several cron simulators, eg this, say it should be 5/15 * * * *, but when I use that, nothing runs.
What should be the proper syntax?
I have an account which has never been logged in, but ps shows stuff running under that account:
How is this possible? What could be the above apps that are running? Has my machine been hacked?
I have two Ubuntu servers, both with umask 0002. On one of them, whenever I created a new sub-folder in a folder named public, the new sub-folder has the setgid bit set to S. On the other machine, it is s.
ls -al ./public shows the same filemodes on both machines:
drwxrwsr-x+ pi grp1 4096 Nov 27 15:36 .
drwxrwsr-x+ pi grp1 4096 Nov 14 21:56 ..
Which setting creates this difference? How do I make the S one have new folders created with s?
I want to demonstrate serial communications in a class. Is it possible/how to set up a good old port 23 unencrypted console service in Ubuntu?
What is the command or script that generates the report that says:
xx packages can be updated.
yy of these updates are security updates
I have an Ubuntu instance running a Node app. This is a web server application, so it is a long-running program that doesn't exit.
If I then run a Node script: node ./something.js, would this process use the exact same node memory image that was running the web server app?
I am not the owner but in the same group as a file. The file has -rw-rw-r-- permissions, and:
beet ~> umask -S
u=rwx,g=rwx,o=rx
Over WinSCP, I am able to update the file but it produces this error:
error occurred while setting permissions and/or timestamp
Why is this happening and is there a way to overcome this?
I have an old Ubuntu system. crontab -l shows that a particular job is running every 30 minutes:
# m h dom mon dow command
30 * * * * ~/scripts/ferc.sh
However, I am unable to find this line in /etc/crontab or any file in all of the /etc/cron.* folders.
Where else can cron configuration be kept?
I have just created an Ubuntu 18.04 instance on AWS and copied an existing project over. The usual shebang line for Node #!/usr/bin/env node now doesn't work. It gave:
#!/usr/bin/env: No such file or directory
What could be wrong?
My $PATH variable is:
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
which node gives: /usr/bin/node
which nodejs gives /usr/bin/nodejs
ls -l nodejs gives: /usr/bin/nodejs -> /etc/alternatives/nodejs
ls -l /usr/bin/env gives:
-rwxr-xr-x 1 root root 35000 Jan 18 2018 /usr/bin/env
Is it possible to make the color of the title bar of the active window different from the rest?
Right now it's black for all windows in my default set-up. I am unable to determine if I can start typing as I don't know which the focused window is.
I have a brand new installation of Ubuntu 18.04. I then ran apt-get install curl and it gave me:
Package 'curl' has no installation candidate
I then ran apt-get update and tried installing curl again and it worked this time.
The term "update" can mean lots of things. What does it mean in the above context? what was it updating given that the Ubuntu I had just installed was the latest?
The default mirror for my apt-get is always returning Hash Sum mismatch.
How do I find the list of mirrors and specify one? I am not concerned about speed. I just want to install updates reliably.
The default .bashrc in the standard distribution of Ubuntu 16.04 that comes with AWS has these lines:
# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options
HISTCONTROL=ignoreboth
However, it doesn't seem to work. I have been running pm2 restart myApp and pm2 list repeatedly using the Up Arrow key, and the command buffer now contains nearly a hundred lines of these.
What could be wrong?
I needed JDK 8 for Bazel. I ran sudo apt-get install openjdk-8* on a freshly built Ubuntu 16.04.02 machine, but after installation update-alternatives --config java show two paths:
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java
I purged opensdk-8* and then installed apt-get openjdk-9* but the outcome was the same.
How do I get JDK 8?
I am trying to use sendmail out of the box using the default configuration. (I just need an MTA to deliver mail out from my application.) When I try to send a mail, I get:
Cannot write ./dfv5T8wZmB004563 (bfcommit, uid=0, gid=115): No such file or directory]
QueueDirectory in sendmail.cf says /var/spool/mqueue. I created that folder and gave write rights to the world, but the same error message persists. Note that t says doesn't exist and not permission denied. So what folder is it attempting to write to?
I discovered that my machine had sendmail installed and running only after I failed experimenting with Postfix. I purged Postfix and found that sendmail was running.
I see various references to "custom" folders in the /etc folder, with names matching some config file, eg /etc/resolv.conf and appended with .d. Examples are resolv.conf.d or cron.d.
Where can I find more documentation about this folder structure, the types of files that can be in them, the order of precedence, etc.