Below are the basic UNIX commands which are frequently used in ETL Testing and are often asked in interviews :-
1.) ls
ls command is used for listing of files in a directory.
Example:
2.) cat
cat command is used for displaying the contents in a file.
Example:
cd command is used for changing from one directory to another directory.
Example:
4.) touch
touch command is used for creating zero byte file or empty file.
Example:
5.) cp
cp command is used to copy the contents of source file into target file.
Example:
6.) mv
mv command is used to move files from one directory to another directory. It is also used for renaming files
Example:
7.) rm
rm command is used to remove or delete files.
Example:
8.) mkdir
mkdir command is used to create directories for organizing files.
Example:
9.) head
head command is used to print first n number of lines from the file. By default, it displays first 10 lines from each file.
Example:
10.) tail
tail command is used to print last n number of lines from the file. By default, it displays last 10 lines from each file.
Example:
11.) wc
wc command is used to find number of lines, words and characters in a file.
Example:
12.) grep
grep command print lines in files that match patterns.
Example:
13.) pwd
pwd command prints current working directory
Example:
14.) chmod
chmod command is used to change the permission of file or directory.
Example:
15.) man
man command displays the manual page for a given command.
Example: man ls
