Need to sum of last column based on pipe delimiter
I have below inputs with huge number of rows
Unix & Linux
Insert new lines with missing values (NA)
I would like to insert new lines in text files if there are missing values.
I have for example the following text file (A.txt), for which line 5 is missing. In addition, as the file should have 12 lines the lines 11-12 are also missing.
How to make a comprehensive set of possibilities for defining GNU-screen “command characters”?
I want to somehow generate a comprehensive “menu” of all possible ways to set up the GNU-screen “command characters” for a standard, off-the-shelf “US keyboard” and a specific terminal emulator, say xfce4-terminal.
Getting WISPr tags from a FON authentication portal
I am doing some investigation around wifi captive portals development.
ssh with separate stdin, stdout, stderr AND tty
This local command is the reference point. Let’s assume it successfully processes some binary data:
Start a process on a different tty
After about an hour of Googling this, I can’t believe nobody has actually asked this question before…
How can I put a bit mask on /dev/zero so that I can get bytes other than zero?
How can I put a bit mask on /dev/zero so that I can have a source not only for 0x00 but also for any byte between 0x01 and 0xFF?
Extract only a specific file from a zipped archive to a given directory
I need to extract a single file from a ZIP file which I know the path to. Is there a command like the following:
Can’t apply brightness to terminal’s background color
I have a problem with colors in my terminal emulator. I am using LXTerminal as my terminal emulator and LXDE as my desktop environment.
Most efficient method to empty the contents of a file
I am aware of three methods to delete all entries from a file.