Posted in Uncategorized

tmux – Keep Jobs Running

tmux – a “terminal multiplexer” – lets you control several windows to the command line from one terminal session. Additionally you can leave tmux and close the terminal – this is very handy, if you have long running programs, and have to leave the office.

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Posted in Linux commands

systemd, Part I

For my sensor network I run a server process, which collects the data from several sensors. This is a sort of a daemon. In a first version it was started in a crontab with the time “@reboot”. But during the development I had to restart it every now and then: search the PID, kill it, start it in the background.

Isn’t there a better way? systemd to the rescue. In this first systemd post I will install a service file, so that the process can be started and stopped from the root account.

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Posted in bash

Changing directories

Everyone knows the command cd – everyone uses it several times a day. (OK – not everyone, but every Linux user.) Most of us know, that we can change back to the last directory with

$ cd -


$ pwd
$ cd /opt/sensors/bmp280
$ pwd
$ cd -
$ pwd

But what if you cd in your project directory and then need to change back into your docs directory? You have to type the whole path. Or do you?

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Posted in bash

Make and Change into Directory

Several times a day I have to create a directory and have immediately change into this directory. After a while I found it rather annoying to type every time

$ mkdir new_directory
$ cd new_directory

So I created a shell function to reduce the typing:

mcd ()
    mkdir -p "$@" && cd "$@"

Now I have to type only

$ mcd new_directory

and magically I’m in the newly created directory.

Posted in Linux commands

“find” with Style, Part 3: Displaying File Attributes

If you search files with the find command, you get a list of filenames:

$ find . -name '*.py'

If you need the file attributes (like size, file permissions, …) you can do some tricks to let ls do the job. Or do you?

find has the parameter -ls which does this:

$ find . -name '*.py' -ls