Gain insights into data processing using Bash, sed, awk, and RegEx. Explore sorting, searching, replacing, and optimizing data tasks interactively with animated videos, projects, quizzes, and tasks.

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2500+ students have taken this innovative project-based data learning course (includes video lectures). It demonstrates the use of Bash shell (Bash, sed and awk including RegEx) in processing textual data. It can help to learn to sort, search, match, replace, clean and optimize various aspects of data with Bash Shell. The target audience (students, researchers, scientists, journalists, data miners, developers) didn't have to go through any tough learning curve. This course also should have helped RedHat, SuSE and Ubuntu Linux learners and Data Science enthusiasts.  Regularly updated, new projects to come!

- Learn Bash commands interactively
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- Animated video lectures (for visual learners)
- Demonstrations
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Learn Data Science with Bash Shell

# Bash if-else
**To compare integers we use can the following operators:**

|Operator | Description   |  
|---|---|
| `-eq`  | Equal to  |
| `-ne`  | Not equal to  |
| `-gt`  | Greater than  |
| `-ge`  | Greater than OR equal to |
| `-lt`  | less than |
| `-le`  | less than OR equal to |

The following example shows how to use the number comparison
operators in an if statement.



#!/bin/bash

total=${1}
if [ $total -eq 1 ]; then
	echo "the number is equal to 1"
else
	echo "the number is NOT equal to 1"
fi

Bash `elif` is short for `else if` which can allow us to to select one of
many blocks of code to execute by testing two or more conditional
expressions. The `If-elif-else` syntax is given below:



~~~~~~

if [ conditional expression1 ]
then
	statement 1
	statement 2
	..
elif [ conditional expression2 ]
then
	statement 3
	statement 4
	..
else
	statement 5
fi
~~~~~~

**Bash file test operators:**

| File Test | Operator Description |
|---|---|
|`-e` | File exists (this could be regular file, directory, block device, character device, etc.,) |
| `-f` | It's a regular file (for example: `/etc/shadow`)| 
|`-d` | It's a directory (for example: `/var`) |
|`-b` | It's a block device (for example:`/dev/sdb`) |
|`-c` | It's a character device (for example:`/dev/tty2`) |
|`-s` | File is not empty |
|`-r` | File read permission |
|`-w` | File write permission |
|`-x` | File execute permission |
|`-u` | suid set on the file |
|`-g` | sgid set on the file | 
|`-k` | Sticky bit set on the file |
|`-p` | It's a pipe |
|`-S` | It's a socket |
|`-h` | It's a symbolic link |
|`-t` | Checks whether the given FD is opened in a terminal. |
|`-O` | You own the file |
|`-G` | File group id and my group id are the same. |
|`-N` | Did the file got modified since last read? |
| `file-a -nt file-b` | file-a is newer than file-b |
| `file-a -ot file-b` | File1 is older than file2 |
| `file-a -ef file-b` | Both file1 and file2 are hard linked to the same file |

Example:


Course Introduction

Project 1: Analyzing the 'US News' University Ranking Data

Project 2: Facebook Data Mining

Project 3: Australian Cities Crime Statistics

Project 4: Shakespearean-era plays and poems data mining

Bash Tutorials

REGEX Tutorials

AWK Tutorials

SED, GREP and Find Tutorials

Beyond the Text Files! Enter into the Big Data Landscape - Concepts

Conclusion

Bash conditional statements

Bash if-else

Operator	Description
`-eq`	Equal to
`-ne`	Not equal to
`-gt`	Greater than
`-ge`	Greater than OR equal to
`-lt`	less than
`-le`	less than OR equal to