An excellent 2014 IBM research paper “An Updated Performance Comparison of Virtual Machines and Linux Containers” by Felter et al. provides a comparison between bare metal, KVM, and Docker containers. The general result is: Docker is nearly identical to native performance and faster than KVM in every category. The exception to this is Docker’s NAT — if you … Read more
cd /path/to/your/folder sed -i ‘s/foo/bar/g’ * Occurrences of “foo” will be replaced with “bar”. On BSD systems like macOS, you need to provide a backup extension like -i ‘.bak’ or else “risk corruption or partial content” per the manpage. cd /path/to/your/folder sed -i ‘.bak’ ‘s/foo/bar/g’ *
I’m assuming you want to still see standard error and standard output on the terminal. You could go for Josh Kelley’s answer, but I find keeping a tail around in the background which outputs your log file very hackish and cludgy. Notice how you need to keep an extra file descriptor and do cleanup afterward … Read more
You’ll need tail. Some examples: $ tail great-big-file.log < Last 10 lines of great-big-file.log > If you really need to SKIP a particular number of “first” lines, use $ tail -n +<N+1> <filename> < filename, excluding first N lines. > That is, if you want to skip N lines, you start printing line N+1. Example: … Read more
curl -s http://google.com > temp.html works for curl version 7.19.5 on Ubuntu 9.10 (no progress bar). But if for some reason that does not work on your platform, you could always redirect stderr to /dev/null: curl http://google.com 2>/dev/null > temp.html
me=`basename “$0″` For reading through a symlink1, which is usually not what you want (you usually don’t want to confuse the user this way), try: me=”$(basename “$(test -L “$0” && readlink “$0” || echo “$0″)”)” IMO, that’ll produce confusing output. “I ran foo.sh, but it’s saying I’m running bar.sh!? Must be a bug!” Besides, one … Read more
I always wanted to do this and found a nice and easy way of doing it. I wrote down the complete procedure just in case anyone else needs it. First install a 16 kB program called xclip: sudo apt-get install xclip You can then pipe the output into xclip to be copied into the clipboard: cat … Read more
In your terminal, type: scp your_username@remotehost.edu:foobar.txt /local/dir replacing the username, host, remote filename, and local directory as appropriate. If you want to access EC2 (or other service that requires authenticating with a private key), use the -i option: scp -i key_file.pem your_username@remotehost.edu:/remote/dir/foobar.txt /local/dir From: http://www.hypexr.org/linux_scp_help.php
If the user or sysadmin did not kill the program the kernel may have. The kernel would only kill a process under exceptional circumstances such as extreme resource starvation (think mem+swap exhaustion).
Use pkill -f, which matches the pattern for any part of the command line pkill -f my_pattern Just in case it doesn’t work, try to use this one as well: pkill -9 -f my_pattern