Working with files and directories
echo - display a line of text
hostname - show or set the system's host name
whoami - print effective userid
pwd - print name of current/working directory
mkdir - make directories
cd - Enter to the folder
rmdir - remove empty directories
head - output the first part of files
PS1 (Prompt String 1) - PS1 prompt which is a inbuilt shell variable
Bash History Commands
How to shows your default shell
od - dump files in octal and other formats
tac - concatenate and print files in reverse
tail - output the last part of files
wc - print newline, word, and byte counts for each file
mv - move (rename) files
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