Commands by tracyjump (0)

  • bash: commands not found

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Create a persistent connection to a machine
Create a persistent SSH connection to the host in the background. Combine this with settings in your ~/.ssh/config: Host host ControlPath ~/.ssh/master-%r@%h:%p ControlMaster no All the SSH connections to the machine will then go through the persisten SSH socket. This is very useful if you are using SSH to synchronize files (using rsync/sftp/cvs/svn) on a regular basis because it won't create a new socket each time to open an ssh connection.

Run a program transparently, but print a stack trace if it fails
For automated unit tests I wanted my program to run normally, but if it crashed, to add a stack trace to the output log. I came up with this command so I wouldn't have to mess around with core files. The one downside is that it does smoosh your program's stderr and stdout together.

Send an http HEAD request w/curl

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Don't save commands in bash history (only for current session)
Unsetting HISTFILE avoid getting current session history list saved.

Show CPU usage for EACH cores

redirect stdout and stderr each to separate files and print both to the screen

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

connects to a serial console
e.g., 'screen -L /dev/ttyUSB0 38400' listens to your Holux M-241 GPS logger and turns on automatic logging

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.


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