1. CAT
It will show content of whole file
Command :
cat <file_name>
2. PWD
It will print the directory in which you are working
Command
pwd
3. LS
It will show all the content of a directory. you can see all the files and directory present in the current directory.
Command
ls
4. MKDIR
To create a directory you need to use the below command
mkdir <dir name> mkdir -p <dirname1>/<dirname2>
If you use -p it will create the subsequent directories as well.
5. ECHO
To print the variables you can use
command
echo $variable_Name
6. HEAD
When the file is very big, and you just need to see the sample data of it, Then you can use
command
head -n 5 <name of file>
Where 5 is the number of lines, which you want to see.
7. TAIL
Many times to check the logs of any big data applications, you need to see the content of the log file, which gets appended in real-time. You can use the below command
tail -50f <log file name>
8. MV
To move one file or directory to another file or directory.
command
mv <file_name> <new file path>