Today's topic: Becoming the Done Quick Champion, but with a bash script!
Week 7's lab was definitely my favorite - I loved the competition and trying to figure out the fastest ways to do the tasks! The search for the sed
option was the most memorable part, as my lab tutor, Bryan, had hinted you can edit files with a command, and finding this option was so rewarding!
For this lab report, I'll be revisiting this lab, and figuring out how run all the tasks with only one command, using bash scripts!
For this attempt, I simply thought you could just put the ssh command, then the commands to execute the rest of the steps, into a bash script and just run this script from the terminal. I expected the program to execute the ssh login, then upon successful login, run the commands after it in the script. This is the bash script I made, which consisted of the log-in command then the commands to execute all the steps I had come up with in lab 7:
ssh [email protected]
git clone [email protected]:Anthonyp0329/lab7.git
cd lab7/
javac -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar *.java
java -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar org.junit.runner.JUnitCore ListExamplesTests
sed -i '43 s/index1/index2/' ListExamples.java
javac -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar *.java
java -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar org.junit.runner.JUnitCore ListExamplesTests
git add ListExamples.java
git commit -m “yay”
git push origin main
However, this is the output I got when I ran the script using bash:
None of the commands after the ssh actually ran, and only ran once I exited the remote server! This made me realize I had to specify that the
commands had to be run on the remote connection, which led me to the solution.
Here's how I made the commands able to run inside the remote connection. After a quick Google search, I realized I could run commands inside the remote
connection by formatting my ssh command like so:
ssh [email protected] "[commands I want to run]"
I didn't want to paste all my commands inside the quotations, as I was skeptical this would work and too lazy to Google search a way to do this.
Instead, I realized I could make a bash script in my account on the ieng6 server with all the commands I wanted to run, and simply run it as well
as the ssh login by doing:
ssh [email protected] "[script_name].sh"
So then, I logged into my account, and made a file called run_all.sh, the contents of which are:
git clone [email protected]:Anthonyp0329/lab7.git
cd lab7/
javac -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar *.java
java -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar org.junit.runner.JUnitCore ListExamplesTests
sed -i '43 s/index1/index2/' ListExamples.java
javac -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar *.java
java -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar org.junit.runner.JUnitCore ListExamplesTests
git add ListExamples.java
git commit -m “yay”
git push origin main
I then went back to my own terminal, and made a script called fast_script.sh which just contained:
ssh [email protected] "run_all.sh"
Then, I ran bash_script.sh and watched the magic happen :). Here's what my terminal showed:
This ran all the appropriate commands inside my server account, and even kept me in my terminal, with only one command! We can also check that this all actually worked and pushed the changes to github by checking github itself:
As we can see, the commit "yay" appears, meaning everything worked!!
Now, I believe I've done the steps as fast as possible. Automation central :)!
Thanks for reading!! -Anthony