Starred posts

Artur Meinild

Oct 25, 2020 17:02

Finally for cron expressions, I like this little tool: crontab.guru

5

Zanna

Nov 1, 2020 15:44

For some reason, some people seem to add the -r and -f options every time they use rm. That's bad! The -r option makes rm recursive, so that it can remove directories and their contents. Obviously, if you mess up and type the wrong thing as an argument, you would lose a lot more data with -r than without. So you should only use -r when you're sure you want to completely and permanently remove a directory.

4

Artur Meinild

Oct 25, 2020 17:07

Thanks all! Oh and we must not forget: pastebin.com/siaGhWNs

4

Zanna

Oct 21, 2020 08:04

All previous lesson transcripts have been saved as bookmarks for anyone wanting to catch up

4

terdon

Oct 18, 2020 15:52

@Zanna No, we only do Ubuntu here, no SuSe or anything else.

3

user3140225

Oct 11, 2020 16:32

@jokerdino Thank you for organizing the lessons and for your input here today and yesterday!

3

Eliah Kagan

Oct 11, 2020 16:31

@jokerdino If you want to know how long date takes to tell you the date and time then you could time it with time by running time date. :)

3

terdon

Oct 11, 2020 16:00

Brain overflow is off topic here. We only answer questions about Ubuntu.

3

Zanna

Nov 1, 2020 15:59

help cd | less

2

jokerdino

Oct 18, 2020 15:52

I have a tomato as well

2

Zanna

Oct 18, 2020 15:34

The important thing is not to get confused between redirection and pipes. Output redirection* causes the output of a command to be written to a file. Pipes cause the output of a command to become the input to another command. That command might write a file (like `tee` does), but piping itself doesn't create or overwrite or append to files like redirection does.

* we have been using output redirection, but we can also redirect input from a file to a command.

2

Zanna

Oct 11, 2020 15:27

cd -

2

jokerdino

Oct 11, 2020 15:27

I am somewhere near lost+found

2

Zanna

Nov 1, 2020 16:40

(I'm interested in ZFS, if you want to talk more about it)

Artur Meinild

Nov 1, 2020 16:28

The "user" field is unique to system crontab

Artur Meinild

Nov 1, 2020 16:20

But this file should only be edited with crontab -e, and not manually

Eliah Kagan

Nov 1, 2020 16:20

User crontabs are stored in /var/spool/cron but it is not recommended to edit them there and that directory is owned by root without even read permission for other users.

Zanna

Nov 1, 2020 16:02

<3 to all thank you for your patience!

jokerdino

Nov 1, 2020 16:01

thanks @αғsнιη @technastic_tc @terdon @EliahKagan @BeastOfCaerbannog @ArturMeinild @SirGuelph @Kulfy for participating in the lesson and making it a great success

jokerdino

Nov 1, 2020 15:36

I also deleted the old new old list to remove any incriminating evidence

Zanna

Nov 1, 2020 15:15

@technastic_tc no need to resort to extreme measures

jokerdino

Oct 25, 2020 16:26

@αғsнιη most important stuff

Artur Meinild

Oct 25, 2020 16:06

Secure Shell (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. SSH can be used for many things, including:
- For login to a shell on a remote host
- For setting up automatic (passwordless) login to a remote host
- To backup and copy files efficiently and securely using SCP, SFTP or Rsync
- Plus many other things

Zanna

Oct 25, 2020 15:33

Globbing doesn't only work with ls - it's a feature of the shell itself. It's not ls that expands stuff, it's Bash. ls receives the arguments four one three and two because the shell expands [otf]* to all the filenames that expression matches. So, we can use globbing with all sorts of commands.

Artur Meinild

Oct 18, 2020 16:01

I use this one: devhints.io/bash

terdon

Oct 18, 2020 15:49

Here's some further reading on some of the things Zanna mentioned:

Artur Meinild

Oct 18, 2020 15:34

@αғsнιη embrace the pipe

terdon

Oct 18, 2020 15:27

Which is also why the time zone isn't necessarily your own.

Zanna

Oct 12, 2020 18:06

yes... you get a nice email reminder in advance of an event you have signed up for!

terdon

Oct 11, 2020 16:42

"\e[A": history-search-backward
"\e[B": history-search-forward

jokerdino

Oct 11, 2020 16:32

Thanks everyone for making this lesson a grand success. @αғsнιη @EliahKagan @karel @user3140225 @Zanna @technastic_tc

Zanna

Oct 11, 2020 16:31

Thank you so much for participating @αғsнιη @karel @user3140225 @EliahKagan @jokerdino @technastic_tc @terdon and anyone else who was here - you have been awesome!

Eliah Kagan

Oct 11, 2020 16:30

Thanks @Zanna!

technastic_tc

Oct 11, 2020 16:29

Thanks @Zanna for the session. Thanks @EliahKagan and @jokerdino for supporting Zanna!

Zanna

Oct 11, 2020 16:11

@user3140225 yes :) that demonstrates that you don't have to export again after changing the value - the date command got the update. This is always the case when you change an environment variable - you don't have to export a variable that is already in the environment, you can just assign a new value to it (although nothing bad happens when you unnecessarily export a variable that is already exported).

Eliah Kagan

Oct 11, 2020 16:10

That's very kind, but I only contributed the idea to demonstrate environment variables by running date with TZ set, not the specific progression of commands and explanation -- which is actually better than the way I have shown people, and I shall be linking to it here, I think, to help people in the future.

karel

Oct 10, 2020 14:37

@Zanna man apt doesn't tell you all of apt's options. As far as I'm concerned if it's in man apt-get but not in man apt I try running the same command in apt and it works almost all the time. If it doesn't work in apt then I revert to apt-get.

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