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60 lines
2.0 KiB
60 lines
2.0 KiB
2 years ago
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## in-the-dark
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### Instructions
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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.
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You must do all these steps running only one job!
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Expected output:
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```console
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$ ./in-the-dark.sh
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[1]+ Running "Your running job"
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news_amazon.txt
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model_forecasts.txt
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Ecommerce_purchases.txt
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breast_cancer_readme.txt
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shadow.txt
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standard.txt
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thinkertoy.txt
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$ cat new
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Search complete
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$
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```
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### Hints
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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.
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```console
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$ ls
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is-winner
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printalphabetalt
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printcomb2
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question_mark
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onlyz
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organize_garage
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tetris-optimizer
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unzipstring
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$ ls | grep "z"
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onlyz
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organize_garage
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tetris-optimizer
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unzipstring
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```
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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.
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```console
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$ touch newfile.txt && chmod 755 newfile.txt
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$ ls -l
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-rwxr-xr-x 1 user user 0 jan 2 17:29 newfile.txt
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$
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```
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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.
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> You have to use Man or Google to know more about commands flags, in order to solve this exercise!
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> Google and Man will be your friends!
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