Howto linux

2014-01-29

How to setup passwordless SSH

More information in original Original Post

In order to use ssh without password with jenkins slave:

    $ssh-keygen -t rsa
    $ssh-copy-id -i ~/.ssh/id_rsa.pub MY_USER@MY_SERVER
    $ssh MY_USER@MY_SERVER

How to mount a remote ssh filesystem using sshfs

Original Post:

    sshfs example.com:/stuff /media/home-pc

How to copy with Secure Copy (scp)

Original Post Copy the file “foobar.txt” from a remote host to the local host

    $ scp your_username@remotehost.edu:foobar.txt /some/local/directory 

Copy the file “foobar.txt” from the local host to a remote host

    $ scp foobar.txt your_username@remotehost.edu:/some/remote/directory 

How to untar

    tar -zxvf file.tar.gz

Howto SOX audio

    find -iname '*.wav' -exec soxi -D '{}' \; | awk '{ SUM += $1} END { print SUM }'  

print file name an length

    find -iname '*.wav' -exec sh -c "echo -n '{},'; soxi -D {}" \;> test.csv

Add silence 0.25s

    find -iname '*.wav' -exec sh -c "echo -n '{},'; sox  {} {}.wav pad 0.25 0.25; mv {}.wav {}" \;

How to run user application on Ubuntu startup

This post should represent how it is possible on reboot start the application like tomcat.

More information Cron can be found: Original Post

It is possible define some time moments when some application should be executed. Also it can be used keywords like @reboot

First of all login to remote server as regular user(e.g. ssh MY_USER@MY_SERVER)

Access user lever cron configuration run in command line:

    $ crontab -e

text editor should show up. and you should add line in the end of the file with time and command like

    @reboot /home/MY_USER/tools/tomcat6nodes/tomcat_node6/bin/startup.sh

this will start tomcat shell command “startup.sh” after reboot.

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