# Day-2  #90DaysOfDevOps

### 1) Check your present working directory:-

`PWD`:- This is the command to check the present working directory.

### 2) List all the files/directories including hidden files:-

`ls - is:-` the command where you can list your files and directories. By using various attributes of ls you can check more details i.g date&time, hidden files etc

Attributes:- ls -l:- Its Shows a long list of files/directories.

`ls -lh`:- It's used to display files in an easy-to-read format

`ls -lt`:- to display files/directories order by last modifications time

`ls -ltr`:- sorting the files/directories in the last modifications time in reverse order

`ls -a`:- It will show all the hidden files in the directory. ls -t Listing all files and the last modified file in first order

1. ### Create a nested directory A/B/C/D/E
    
    mkdir -p first\_dir/sec\_dir/third\_dir/
    

but if we have several lists of directories to create then the above way is time-consuming hence by using the below command we can create N. number of directories in a single go

`mkdir -p my_dir_{1..10}`

```plaintext
mkdir -p my_dir_{1..10}
```

\*To create several files we use the below command

`touch class_1{1..16}`

```plaintext
touch class_1{1..16}
```

1. ### Some other Useful commands in industry.
    
    `tail - It` is useful to print the last part of the file (10 Lines by default)
    
    `tail -f` this is the mainly used attribute in org to monitor the growth of log files.
    
    `cat` - this command is mainly used to reads data from the files and give their content as output. it helps to create, view, and concatenate files.