Holberton System Engineering Projects

0x00 Shell Basics

• Current working directory
• List directory contents
• Change directory
• List directory contents in long format
• List directory contents in long format including hidden files
• List directory contents in long format including hidden files and user and IDs numerically
• Make a directory
• Move a file
• Delete a file
• Delete a directory
• Change directory to the previous one
• List all files in current, parent and /boot directory in long format
• Delete a directory
• Print type of file called iamafile
• Create a symbolic link
• Copy all html file to parent directory
• Move files that start with uppercase letter
• Remove files that end with ~
• Create multiple directories inside one another
• lists all the files and directories in the current directory separated by commas

0x01 Shell Permissions

• Change user ID
• Print user ID of current user
• Print all groups current user is part of
• Change owner of file
• Create an empty file
• Adds execute permission to the owner of the file
• Adds execute permission to the owner and the group owner and read permission to other users
• Adds execute permission to the owner, the group owner and other users
• Permissions: owner - NONE, group - NONE, other users - ALL
• Permissions: -rwxr-x-wx
• Set the mode of the file hello the same as olleh
• Set execute permision to all subdirectories of the current directory for owner group owner and aother users
• Create directory with permissions 751
• Change group owner
• Change owner and group owner for all files and directories in working directory
• Change owner and group owner of a file
• Change the owner of the file only if owned by "guillaume"
• Script that will play the StarWars IV episode in the termial
• Create a man page

0x02 Shell Redirections

• Print "Hello, World"
• Print confused smiley: "(Ôo)'
• Print contents of a file
• Print contents of two files
• Print the last ten lines
• Print the first ten lines
• Print the third line of a file
• Create a file with a complicated file name
• Write into a file result of ls -la
• Duplicates the last line of a file
• Deletes all the regular files with a .js extension in present and subfolders
• Count the number of directories and sub-directories including hidden ones
• Print the 10 newest files in the current directory
• Takes a list of words as input and prints only words that appear once
• Print lines containing the pattern "root"
• Print the number of lines that contain the pattern "bin" in a file
• Print lines containing the pattern "root" and 3 lines after them in the file
• Print all the lines in the file that do not contain the pattern "bin"
• Print all lines of the file starting with a letter
• Replace letters A and c to Z and e
• Removes all letters c and C
• Reverse input
• Print all users and their home directories, sorted by users
• Parse through TSV file and print the 11 hosts or IP addresses with the most requests

0x03 Shell Variables expansions

• Create alias with name ls with value rm *
• Prints hello (current Linux user)
• Add /action to the PATH
• Count number of directories
• List environment variables
• Creates a new local variable
• Create a new global variable
• Print the result of the addition of 128 with the value stored in a environment variable
• Print the result of two environment variables divided
• Print the result of one environment variable to the power of the other
• Converts a number from base 2 to base 10
• Creates all possible combinations of two letters, except oo
• Prints a number with two decimal places
• Converts a number from base 10 to base 16
• Encodes and decodes text using the rot13 encryption