Hands on Bash >

This repository covers a almost all the basics of bash shell scripting, startig from scratch!

Topics Covered

The complete repository is arranged in following 22 major topics. These topics are given below:

1. Hello Bash Scripting
2. Redirect to file

3. Comments+
   > single line
   > multi line
   > heredoc

4. Conditional Statements
   > if-elif-else
   > case
   > operators

5. Loops
   > while
   > until
   > for
   > break
   > continue

6. Script I/P
   > $1, $2.., $#, $0, $@
   > stdin (standered input)

7. Script O/P
   > stdout, stderr
   > 1> 2>
   > shortcuts: >, 1>&2, >&

8. Pipes & Export b/w Scripts
   > ./export

9. String Ops
   > {var^}
   > {var^l}
   > {var^^}

10. Numbers and Arithmetic
    > (( ))
    > bc calculator
    > obase / ibase

11. declare Command
    > restrict var. behaviour
    > var. type can’t be restricted
    > eg -r (read only) var declearation

12. Arrays
    > all elements - arr[@]
    > index - !arr[@]
    > count/len - #arr[@]
    > delete - ‘unset arr[index]’
    > add - arr[ANY index]=val

13. Functions
    > ‘local’ var
    > passing param - funName arg1 arg2 ..
    > returning

14. Files and Dir
    > mkdir, touch, >, »
    > -r, -w, -x, -d, -e, -f

15. Sending Emails
    > install smtp
    > ssmtp.config
    > mail structure

16. Curl in Script
    > -O - keep web name
    > -o <file name>, > <file name>
    > flag ‘-I’ - header of file

17. Professional Menu
    > select loop
    > waiting (-t <sec>)

18. Filesystem Events
    > Waiting with ‘inotify’
    > using inotifywait
    > flag -m

19. Intro to grep
    > count -c
    > case-ignore -i
    > line-num -l
    > except-match -v

20. Intro to awk
    > using {print}
    > selecting nth ({print $n}) field from line
    > picking multiple fields ({print $1,$4,$7})
    > searching in line –> /searchKey/

21. Intro to sed
    > sed –> screen-editor
    > substituting ‘s/-/-/’
    > applying globally - ‘g’
    > manipulating file (-i)

22. Debugging Bash Scripts
    > while execution cmd (bash -x)
    > decleared in script (#!<path-bash> -x)
    > Specific part (set -x …<to be debugged>… set +x)

---

* Codes can be accessed by visiting through the link provided with the topic titles.