I was writing things in a file and then executing them with
node file.js when I decided it was time to work inside the Node repl.
For this the question became how do you load your file and have access to the functions and variables.
It is common to assume in the programming world that any competent programmer should be able to learn a new programming language in a few days and be productive within a week or so. Many will brag about their knowledge of multiple languages and how they did this in that and that in this.
I've found this myself. In fact, my last project required me to move between Bash, Java, Python and Clojure daily and sometimes throughout the day.
I wonder though if some sort of specialization might be better. In my last project I wished to focus exclusively on Clojure but that didn't work out.
To show the headers for each csv file in a directory.
#!/bin/bash # Echo the header lines for all the cvs files in the current directory for filename in *.csv; do # echo $filename; line=$(head -n 1 $filename); echo $line; done
When writing bash scripts that look for environment variables it is a good idea to check that these environment variables exist at the top of the script. For this you do things like the following.
if [[ -z $LOG ]]; then echo "Missing LOG environment variable" fi
Now once you've created your environment variable how can you test your script for the case where the environment variable doesn't exist? For this you can open another bash shell with no environment variables. An empty environment if you will. To do this try the following.
$ env -i bash --norc --noprofile
Ran out of space on the MacBook and found this free Mac cleaner application that worked well.
AppCleaner from FreeMacSoft