System Commands, OPPE 1

May 2023 term, Set 1

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Question 1

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Write a bash script which calculates the size of the current working directory by adding the size each file. Assume that the directory contains only files and no subdirectories.

Hint: Use ls -l get the file size information

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#!/usr/bin/env bash
# Write your script here

#!/usr/bin/env bash # Write your script here

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Write a bash script which calculates the size of the current working directory by adding the size each file. Assume that the directory contains only files and no subdirectories. Hint: Use `ls -l` get the file size information An `authlog` is copied from the `/var/log/` directory to the current working directory. Generate a report from the `authlog` file which reports the failed logins, successful logins, invalid users and sudo access attempts. **Sample data:** ```text Jul 16 14:13:13 vm212 sshd[444802]: Connection closed by authenticating user 2******* 194.***.***.*** port 59232 [preauth] Jul 16 14:13:19 vm212 sshd[445097]: Accepted password for 2******* from 194.***.***.*** port 33668 ssh2 Jul 16 14:13:19 vm212 sshd[445097]: pam_unix(sshd:session): session opened for user 2*******(uid=3339) by (uid=0) Jul 16 14:49:51 vm212 sshd[452702]: Invalid user from 194.***.***.*** port 48804 Jul 16 14:49:54 vm212 sshd[452702]: Connection closed by invalid user 194.***.***.*** port 48804 [preauth] Jul 16 14:58:00 vm212 sshd[454221]: Invalid user web from 194.***.***.*** port 44484 Jul 16 14:58:00 vm212 sshd[454221]: pam_unix(sshd:auth): check pass; user unknown Jul 16 14:58:00 vm212 sshd[454221]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=194.***.***.*** Jul 16 14:58:02 vm212 sshd[454221]: Failed password for invalid user web from 194.***.***.*** port 44484 ssh2 Jul 16 14:58:02 vm212 sshd[454221]: Received disconnect from 194.***.***.*** port 44484:11: Bye Bye [preauth] Jul 19 11:12:52 vm212 sudo: pam_unix(sudo:auth): authentication failure; logname=ubuntu uid=3141 euid=0 tty=/dev/pts/3 ruser=ubuntu rhost= user=ubuntu ``` The current directory contains multiple files(no directories) with different extensions like `.txt`, `.py`, `.m`, etc.,. Write a bash script to organize the files into folders according to their file extensions. The directory names should be same as the file extensions(case sensitive). Example:`file.C` will be moved to the directory named `C`. Do not print anything from your script.