public/subjects/devops/in-the-dark

in-the-dark

Instructions

Create a script in-the-dark.sh which will execute a job in the background that will run the command ls which will recursively list all files and directories in the current directory and its subdirectories. The output will be piped into the grep command, which will search for all files with the .txt extension. After the search is complete, you must redirect to a file "new" the following string "Search complete". You also need to List all background jobs.

You must do all these steps running only one job!

Expected output:

$ ./in-the-dark.sh
[1]+  Running                 "Your running job, this is just an example of output"
news_amazon.txt
model_forecasts.txt
Ecommerce_purchases.txt
breast_cancer_readme.txt
shadow.txt
standard.txt
thinkertoy.txt
$ cat new
Search complete
$

Hints

To run the ls command recursively in the background on a lot of files, you can use the -R option which will recursively list all files and directories in the current directory and its subdirectories. The output must be piped into the grep command. Here is a similar example.

$ ls
is-winner
printalphabetalt
printcomb2
question_mark
onlyz
organize_garage
tetris-optimizer
unzipstring
$ ls | grep "z"
onlyz
organize_garage
tetris-optimizer
unzipstring

The && operator is used to combine multiple commands, and execute them as a single command. It is often used to run multiple commands in sequence, where the second command only runs if the first command succeeds.

$ touch newfile.txt && chmod 755 newfile.txt
$  ls -l
-rwxr-xr-x   1 user user       0 jan  2 17:29 newfile.txt
$

This will run the touch command, which will create a new file called "newfile.txt". If the touch command succeeds, the chmod command will run and change the permissions of "newfile.txt" to allow the owner to read, write, and execute the file, and allow everyone else to read and execute the file.

You have to use Man or Google to know more about commands flags, in order to solve this exercise! Google and Man will be your friends!