If you installed R from the Ubuntu repository with
sudo apt-get install r-base
you most likely got an out of date version. In February 2018, that method still gave me R version 3.2.3 (2015-12-10). To get the latest versions of R and its packages, you need to add CRAN to the apt-get repositories. Do this with the code below. Enter one line at a time. Cut and paste to prevent errors.
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
sudo add-apt-repository 'deb [arch=amd64,i386] https://cran.rstudio.com/bin/linux/ubuntu xenial/'
sudo apt-get update
Now if you open Synaptic Package Manager and search for r-base, you should see the installed versions and the latest versions of several packages (e.g. r-base, r-base-core, r-base-core-dbg, r-base-dev, r-base.html). Mark the packages for upgrade and click on apply. This will most likely result in a major update of R so that the next time you run R only the base packages will be available. You will have to re-install any additional R packages that you use to match the updated version of R.
Adapted from https://www.digitalocean.com/community/tutorials/how-to-install-r-on-ubuntu-16-04-2
If you need to know the execution time for a bash script, you can place it inside the script below. The the total run time will be printed to the screen after the script finishes.
<your script here>
dt=$(echo "$res2 - $res1" | bc)
dd=$(echo "$dt/86400" | bc)
dt2=$(echo "$dt-86400*$dd" | bc)
dh=$(echo "$dt2/3600" | bc)
dt3=$(echo "$dt2-3600*$dh" | bc)
dm=$(echo "$dt3/60" | bc)
ds=$(echo "$dt3-60*$dm" | bc)
printf "Total runtime: %d:%02d:%02d:%02.4f\n" $dd $dh $dm $ds
Shamelessly copied from a post on unix.stackexchange.com by jwchew on August 30, 2013 .
Gedit is the basic editor that is included in Ubuntu and other Linux distributions. Its functionality can be extended with plugins as explained in the post below. I installed the plugin initially because it allows one to comment or un-comment selected lines of text. I find this useful when I want to include two configuration blocks in a script, say one for a local installation of a program and another for a remote installation on a cluster. If you do this, just make sure the appropriate blocks are commented and un-commented when you run the script.
Source: Code Comment – gedit Plugin | Delightly Linux