Bash Scripts, from zero to hero!

A collection of examples in Bash scripts.

See references of this repo here.

Introduction

1. example1.sh: Declare variable and print it
2. example2.sh: Remove variable
3. example3.sh: Create readonly variable
4. example4.sh: Raise error and break program
5. example5.sh: Export vairable as environment vairable
6. example6.sh: Special variables
7. example7.sh: Special variables - get string and convert to array (by using $@)
8. example8.sh: Special variables - check if program installed (by using $?)
9. example9.sh: Arrays- Declare array and use it
10. example10.sh: Arrays- create array from return of another command
11. example11.sh: Run command inside file using backtick (`)
12. example12.sh: Operators- arithmetic Operators (using expr and let)
13. example13.sh: Get data from user (input)
14. example14.sh: String conditions
15. example15.sh: Integer conditions
16. example16.sh: Operators- logical operators (-a, &&, -o, ||, !)
17. example17.sh: File conditions
18. example18.sh: Check SUID and GUID in files
19. example19.sh: If statement
20. example20.sh: Case Block
21. example21.sh: Select Loop
22. example22.sh: For Loop
23. example23.sh: While Loop
24. example24.sh: While Loop- more complex example
25. example25.sh: Until Loop
26. example26.sh: Until Loop- more complex example
27. example27.sh: Loop- break command
28. example28.sh: Loop- continue command
29. example29.sh: Redirect- Introduction and simple commands
30. example30.sh: Redirect- Appends to the file
31. example31.sh: Redirect- Discard both stdout and stderr
32. example32.sh: Redirect- Send the contents of a file to the stdin of a command
33. example33.sh: Redirect- Complex redirection
34. example34.sh: Redirect- Open custom file descriptor
35. example35.sh: Redirect- Open a file for read and write with fd
36. example36.sh: Redirect- List all file descriptors
37. example37.sh: Redirect- tee and pip and pip&
38. example38.sh: Get argument from terminal
39. example39.sh: Function- Create functions and call it
40. example40.sh: Function- Define and call function for calculate rectangle area
41. example41.sh: Function- Get Return Value from Function
42. example42.sh: Working with date
43. example43.sh: Sleep Command

Mix Exercises

1. mix_exercise1.sh: Install program after some check like directory exists, ownership and etc.
2. mix_exercise2.sh: Create menu in terminal and choice opetions
3. mix_exercise3.sh: Read a file line by line
4. mix_exercise4.sh: Read the first three columns/fields from a file into variables
5. mix_exercise5.sh: Read first line of file and put it into variable using redirection
6. mix_exercise6.sh: Create directory if not exist
7. mix_exercise7.sh: 4 arthimetrics operators
8. mix_exercise8.sh: Factorial calculator
9. mix_exercise9.sh: Lower case string
10. mix_exercise10.sh: Upper case string

One Line Command

1. one-line1.sh: Get size of file
2. one-line2.sh: Extract file name from the path
3. one-line3.sh: Generate the alphabet from a to z
4. one-line4.sh: Genearte the alaphbet from a to z without space
5. one-line5.sh: Pading numbers with leading zero
6. one-line6.sh: Combine two set of strings
7. one-line7.sh: Find and replace first occurrence with: ${var/find/replace}
8. one-line8.sh: Find and replace all occurrence with: ${var//find/replace}
9. one-line9.sh: Extract a substring from a string
10. one-line10.sh: Change upper case to lower case and vice versa
11. one-line11.sh: Get usage percent of specific file system

External Resources

1. Bash Reference Manual: A brief description of the features that are present in the Bash shell (version 5.2, 19 September 2022)