$ cat /sys/block/sda/queue/rotational #If the output is 1, the disk is HDD. #If the output is 0 (zero), the disk is SDD. #Because, SSDs won't rotate. So the output should be zero # if you have SSD in your system.
Here is what the above code is Doing:
1. The /sys/block/sda/queue/rotational file contains a single number.
2. If the number is 1, the disk is a hard disk drive (HDD).
3. If the number is 0, the disk is a solid-state drive (SSD).
git reset –soft HEAD@{1} Here is what the above code is Doing: 1. git reset –soft HEAD@{1} – This will reset the current branch to the commit before the last commit. – This will not change the working directory. – This will not change the staging area. – This will change the commit history. 2….
date +”%T.%6N” # returns the current time with nanoseconds rounded to the first 6 digits, which is microseconds # In general, every field of the `date` command’s format can be given an optional field width.. Here is what the above code is Doing: 1. `date` is a command that prints the current date and time….
# Bash-specific # syntax ls -R # example ls -R *hotographi* Here is what the above code is Doing: 1. The ls command lists the contents of a directory. 2. The -R flag tells ls to list the contents of the directory and all subdirectories. 3. The *hotographi* tells ls to list only the contents…
git revert Here is what the above code is Doing: 1. git checkout -b – Creates a new branch and switches to it 2. git add – Adds the file to the staging area 3. git commit -m – Commits the file to the branch 4. git checkout – Switches to the branch 5. git…
curl -fsSL https://deno.land/x/install/install.sh | sudo DENO_INSTALL=/usr/local sh Here is what the above code is Doing: 1. curl is a command line tool for transferring data with URL syntax. 2. -fsSL is a set of flags that tell curl to: -f: fail silently if the server returns an error -s: run silently -S: show errors if…
#purely random 12 character string openssl rand 12 # more useful random 12 character strings openssl rand -base64 12 # random hex-code sequence openssl rand -hex 12 Here is what the above code is Doing: 1. openssl is the command to run the OpenSSL toolkit 2. rand is the sub-command to run the random number…