SED commad In Linux O.S

                                        SED command In Linux O.S

SED command in UNIX is stands for stream editor and it can perform lot of function on file like searching, find and replace, insertion or deletion. Though most common use of SED command in UNIX is for substitution or for find and replace.

• Replacing or substituting string

                    sed 's/unix/linux/' a.txt

• Replacing existing with new characters

             sed 's/<old word><new word>' <txt file>

                       or

             cat <txt file> | sed 's/<old word><new word>'

• Numbering of txt file and stream edit by sed

                       cat -n <txt file> | sed 's/<old word><new word>'

• if you want to replace all the message or word in txt file

         sed 's/<old word>/<new word>/g' <txt file>

• change all first-word according to need of a txt file

          sed 's/^/<new word' <txt file>

                   or

•     if you want to change in all the line

                sed 's/^/<new word/g' <txt file>

• when you want to add new word end of each lines

            sed 's/$/<new word want to add> <txt file>

• When need each line spacing means after every line give one line space 

            sed G a.txt

• print only selected lines 

          sed -n <selected lines >p <txt file>

• if you want to delete lines according to need

          sed <no of line>d <txt file>

• if you want to perform multiple operation user -e synatx

          sed -e '2d' -e 'G'  <txt file>

• 2 line or more than one line space        

• search word and change according to you i am changing it to uppercase

         sed 's/<word want to search >/\U&/g' <txt file>

• use ig for ignoring in same command 

                                                                                                Written By Sanjay Kumar

                                   

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