Difference between revisions of "BOSS-Linux/C3/More-on-sed-command/English-timed"

|  In this tutorial, we will learn some more on ''''sed' command'''s through some examples.

|  To record this tutorial, I am using:

|'''Linux''' ''' Operating System''' and

|'''GNU BASH''' version 4.2.24

| you should know basics of '''Linux terminal.'''

| You should be aware of '''sed''' tool.

| For relevant tutorials, please visit our website which is as shown: http://spoken-tutorial.org

| Replacing some pattern in the '''input''' with something else.

|  Let's first look at the original file '''seddemo.txt'''.

|  Notice that the word '''Kumar''' occurs two times in the fourth line and once in the sixth line.

| If you want to replace all occurrences of '''‘Kumar’''' with '''‘Roy’''',

|type on the '''terminal''':

| '''sed space''' within single quote ''''s front slash / opening square bracket small ''k'' capital ''K''  closing square bracket umar  slash Roy slash'''' after the single quotes space '''seddemo.txt'''.

|  To substitute all the matched entries, we need to use the flag ''' g''' option.

| Type:  '''sed space within single quotes 's front slash opening square bracket ''small k'' ''capital K'' closing square bracket umar slash Roy slash g'''' after the single quote space '''seddemo.txt''' press '''Enter'''.

| Say, we want to replace the word  "electronics" with the word "electrical"

| and "civil" with "metallurgy" in the file '''seddemo.txt'''.

|Let me clear the '''prompt'''.

|  Type:  '''sed space hyphen e space within single quotes s front slash electronics slash electrical slash g''' after the single quote '''space hyphen e space within single quotes  s front slash civil slash metallurgy slash g''' after the single quotes space '''seddemo.txt'''

| press '''Enter.'''

|  Now we want to change the '''stream''' of "Anirban" from "computers" to "mathematics".

| In such case, we would need to type:

| First we write '''sed''', then in single quotes we write the pattern to be matched.

| This is "Anirban".

| This is '''s''' that stands for substitution as we have already seen.

| Then we mention the pattern to be replaced which is "computers".

| Then the new word that would be substituted which is "mathematics".

| Say, we want to select those lines which do not have '''stream''' as "electronics".

|  To see the contents, type: '''cat space nonelectronics.txt'''.

| press '''Enter.'''

|  So, in that case, we would write  '''sed space''' in single quotes '''1i space Student Information backslash n 2013'''' after the quotes '''seddemo.txt'''.

| press '''Enter'''.

|  Notice '''backslash n''' between the string ‘Information’ and ‘2013’.

| '''backslash n '''prints 2013 in the next line after ‘Student Information’.

|  This brings us to the end of this tutorial.

|  Let us summarize.

| In this tutorial, we learnt:

|Substitution Replacement and Insertion.

|  As an assignment, use the same text file '''seddemo.txt'''

| and try to replace or substitute name '''Ankit''' with '''Ashish'''.

|  Watch the video available at the link shown below. http://spoken-tutorial.org/What_is_a_Spoken_Tutorial      

| It summarizes the Spoken Tutorial project.

| If you do not have good bandwidth, you can download and watch it.

|  The Spoken Tutorial Project team: Conducts workshops using spoken tutorials.

| Gives certificates to those who pass an online test.

|  '''Spoken Tutorial''' project is a part of the '''Talk to a Teacher''' project.

| It is supported by the National Mission on Education through ICT, MHRD, Government of India.

| More information on this mission is available at the link shown below: http://spoken-tutorial.org\NMEICT-Intro

|This is Ashwini Patil from IIT bombay, signing off.Thank you for joining.