highlight a word without affecting the structure of text












1















$cat contents.txt



cat-1.15



cat-1.15



cat-1.15

cat-1.18


The above output has blank lines



$cat contents.txt | grep cat
results in the word cat being highlighted, but the resultant text is also merged, eliminating blank lines



cat-1.15

cat-1.15

cat-1.15

cat-1.18


How can I grep to highlight without grep affecting the text structure, so that the only difference is the grep term being highlighted ?






awk sed grep







share|improve this question




















  • 1





    Possible duplicate of Convince grep to output all lines, not just those with matches

    – steeldriver
    1 hour ago
















1















$cat contents.txt



cat-1.15



cat-1.15



cat-1.15

cat-1.18


The above output has blank lines



$cat contents.txt | grep cat
results in the word cat being highlighted, but the resultant text is also merged, eliminating blank lines



cat-1.15

cat-1.15

cat-1.15

cat-1.18


How can I grep to highlight without grep affecting the text structure, so that the only difference is the grep term being highlighted ?






awk sed grep







share|improve this question




















  • 1





    Possible duplicate of Convince grep to output all lines, not just those with matches

    – steeldriver
    1 hour ago














1












1








1








$cat contents.txt



cat-1.15



cat-1.15



cat-1.15

cat-1.18


The above output has blank lines



$cat contents.txt | grep cat
results in the word cat being highlighted, but the resultant text is also merged, eliminating blank lines



cat-1.15

cat-1.15

cat-1.15

cat-1.18


How can I grep to highlight without grep affecting the text structure, so that the only difference is the grep term being highlighted ?






awk sed grep







share|improve this question
















$cat contents.txt



cat-1.15



cat-1.15



cat-1.15

cat-1.18


The above output has blank lines



$cat contents.txt | grep cat
results in the word cat being highlighted, but the resultant text is also merged, eliminating blank lines



cat-1.15

cat-1.15

cat-1.15

cat-1.18


How can I grep to highlight without grep affecting the text structure, so that the only difference is the grep term being highlighted ?






awk sed grep




awk sed grep






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 2 hours ago







user607694

















asked 3 hours ago









user607694user607694

354




354








  • 1





    Possible duplicate of Convince grep to output all lines, not just those with matches

    – steeldriver
    1 hour ago














  • 1





    Possible duplicate of Convince grep to output all lines, not just those with matches

    – steeldriver
    1 hour ago








1




1





Possible duplicate of Convince grep to output all lines, not just those with matches

– steeldriver
1 hour ago





Possible duplicate of Convince grep to output all lines, not just those with matches

– steeldriver
1 hour ago










3 Answers
3






active

oldest

votes


















4














With GNU grep this can be accomplished with the -z option.




-z, --null-data




Treat input and output data as sequences of lines, each terminated by a zero byte (the ASCII NUL character) instead of a newline. Like the -Z or --null
option, this option can be used with commands like sort -z to process arbitrary file names.





Also this is a UUOC. You can specify an input file with grep.



$ grep --color cat contents.txt

cat-1.15

cat-1.15

cat-1.15

cat-1.18

$ grep --color -z cat contents.txt

cat-1.15



cat-1.15



cat-1.15

cat-1.18





share|improve this answer



















  • 1





    Note that this will try to read the whole file into memory. If it is big, a big chunk of memory will be used.

    – Isaac
    17 mins ago



















2














Another possible solution is to provide two patterns to grep: one will be the actual pattern or term to be searched for, and the second one will be an empty string. 



$ grep --color -e 'cat' -e '' testfile.txt

cat-1.15



cat-1.15



cat-1.15

cat-1.18


The -e option is used for specify multiple patterns. From the manual:




-e PATTERN, --regexp=PATTERN Use PATTERN as the pattern. This can be used to specify multiple search patterns, or to protect a
pattern beginning with a hyphen (-). (-e is specified by POSIX.)




You can also combine those patterns as a single extended regular expression, if required:



$ grep --color -E 'cat|' testfile.txt

cat-1.15



cat-1.15



cat-1.15

cat-1.18


Also, you can simply add another pattern to the list if you need to highlight more than one keyword.






share|improve this answer































    0














    I tried with below command



    sed -r "/cat/{N;s/^$/&=/}" filename
    

    

    
awk '{if(((length($1)>3)&& ($1 ~ /cat/))||($0~/^$/)){print $0}}' filename





    share|improve this answer























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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      4














      With GNU grep this can be accomplished with the -z option.




      -z, --null-data




      Treat input and output data as sequences of lines, each terminated by a zero byte (the ASCII NUL character) instead of a newline. Like the -Z or --null
      option, this option can be used with commands like sort -z to process arbitrary file names.





      Also this is a UUOC. You can specify an input file with grep.



      $ grep --color cat contents.txt
      
cat-1.15
      
cat-1.15
      
cat-1.15
      
cat-1.18
      
$ grep --color -z cat contents.txt
      
cat-1.15
      

      
cat-1.15
      

      
cat-1.15
      
cat-1.18





      share|improve this answer



















      • 1





        Note that this will try to read the whole file into memory. If it is big, a big chunk of memory will be used.

        – Isaac
        17 mins ago
















      4














      With GNU grep this can be accomplished with the -z option.




      -z, --null-data




      Treat input and output data as sequences of lines, each terminated by a zero byte (the ASCII NUL character) instead of a newline. Like the -Z or --null
      option, this option can be used with commands like sort -z to process arbitrary file names.





      Also this is a UUOC. You can specify an input file with grep.



      $ grep --color cat contents.txt
      
cat-1.15
      
cat-1.15
      
cat-1.15
      
cat-1.18
      
$ grep --color -z cat contents.txt
      
cat-1.15
      

      
cat-1.15
      

      
cat-1.15
      
cat-1.18





      share|improve this answer



















      • 1





        Note that this will try to read the whole file into memory. If it is big, a big chunk of memory will be used.

        – Isaac
        17 mins ago














      4












      4








      4







      With GNU grep this can be accomplished with the -z option.




      -z, --null-data




      Treat input and output data as sequences of lines, each terminated by a zero byte (the ASCII NUL character) instead of a newline. Like the -Z or --null
      option, this option can be used with commands like sort -z to process arbitrary file names.





      Also this is a UUOC. You can specify an input file with grep.



      $ grep --color cat contents.txt
      
cat-1.15
      
cat-1.15
      
cat-1.15
      
cat-1.18
      
$ grep --color -z cat contents.txt
      
cat-1.15
      

      
cat-1.15
      

      
cat-1.15
      
cat-1.18





      share|improve this answer













      With GNU grep this can be accomplished with the -z option.




      -z, --null-data




      Treat input and output data as sequences of lines, each terminated by a zero byte (the ASCII NUL character) instead of a newline. Like the -Z or --null
      option, this option can be used with commands like sort -z to process arbitrary file names.





      Also this is a UUOC. You can specify an input file with grep.



      $ grep --color cat contents.txt
      
cat-1.15
      
cat-1.15
      
cat-1.15
      
cat-1.18
      
$ grep --color -z cat contents.txt
      
cat-1.15
      

      
cat-1.15
      

      
cat-1.15
      
cat-1.18






      share|improve this answer












      share|improve this answer



      share|improve this answer










      answered 2 hours ago









      Jesse_bJesse_b

      12.3k23065




      12.3k23065








      • 1





        Note that this will try to read the whole file into memory. If it is big, a big chunk of memory will be used.

        – Isaac
        17 mins ago














      • 1





        Note that this will try to read the whole file into memory. If it is big, a big chunk of memory will be used.

        – Isaac
        17 mins ago








      1




      1





      Note that this will try to read the whole file into memory. If it is big, a big chunk of memory will be used.

      – Isaac
      17 mins ago





      Note that this will try to read the whole file into memory. If it is big, a big chunk of memory will be used.

      – Isaac
      17 mins ago













      2














      Another possible solution is to provide two patterns to grep: one will be the actual pattern or term to be searched for, and the second one will be an empty string. 



      $ grep --color -e 'cat' -e '' testfile.txt
      
cat-1.15
      

      
cat-1.15
      

      
cat-1.15
      
cat-1.18


      The -e option is used for specify multiple patterns. From the manual:




      -e PATTERN, --regexp=PATTERN Use PATTERN as the pattern. This can be used to specify multiple search patterns, or to protect a
      pattern beginning with a hyphen (-). (-e is specified by POSIX.)




      You can also combine those patterns as a single extended regular expression, if required:



      $ grep --color -E 'cat|' testfile.txt
      
cat-1.15
      

      
cat-1.15
      

      
cat-1.15
      
cat-1.18


      Also, you can simply add another pattern to the list if you need to highlight more than one keyword.






      share|improve this answer




























        2














        Another possible solution is to provide two patterns to grep: one will be the actual pattern or term to be searched for, and the second one will be an empty string. 



        $ grep --color -e 'cat' -e '' testfile.txt
        
cat-1.15
        

        
cat-1.15
        

        
cat-1.15
        
cat-1.18


        The -e option is used for specify multiple patterns. From the manual:




        -e PATTERN, --regexp=PATTERN Use PATTERN as the pattern. This can be used to specify multiple search patterns, or to protect a
        pattern beginning with a hyphen (-). (-e is specified by POSIX.)




        You can also combine those patterns as a single extended regular expression, if required:



        $ grep --color -E 'cat|' testfile.txt
        
cat-1.15
        

        
cat-1.15
        

        
cat-1.15
        
cat-1.18


        Also, you can simply add another pattern to the list if you need to highlight more than one keyword.






        share|improve this answer


























          2












          2








          2







          Another possible solution is to provide two patterns to grep: one will be the actual pattern or term to be searched for, and the second one will be an empty string. 



          $ grep --color -e 'cat' -e '' testfile.txt
          
cat-1.15
          

          
cat-1.15
          

          
cat-1.15
          
cat-1.18


          The -e option is used for specify multiple patterns. From the manual:




          -e PATTERN, --regexp=PATTERN Use PATTERN as the pattern. This can be used to specify multiple search patterns, or to protect a
          pattern beginning with a hyphen (-). (-e is specified by POSIX.)




          You can also combine those patterns as a single extended regular expression, if required:



          $ grep --color -E 'cat|' testfile.txt
          
cat-1.15
          

          
cat-1.15
          

          
cat-1.15
          
cat-1.18


          Also, you can simply add another pattern to the list if you need to highlight more than one keyword.






          share|improve this answer













          Another possible solution is to provide two patterns to grep: one will be the actual pattern or term to be searched for, and the second one will be an empty string. 



          $ grep --color -e 'cat' -e '' testfile.txt
          
cat-1.15
          

          
cat-1.15
          

          
cat-1.15
          
cat-1.18


          The -e option is used for specify multiple patterns. From the manual:




          -e PATTERN, --regexp=PATTERN Use PATTERN as the pattern. This can be used to specify multiple search patterns, or to protect a
          pattern beginning with a hyphen (-). (-e is specified by POSIX.)




          You can also combine those patterns as a single extended regular expression, if required:



          $ grep --color -E 'cat|' testfile.txt
          
cat-1.15
          

          
cat-1.15
          

          
cat-1.15
          
cat-1.18


          Also, you can simply add another pattern to the list if you need to highlight more than one keyword.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 2 hours ago









          HaxielHaxiel

          1,8401510




          1,8401510























              0














              I tried with below command



              sed -r "/cat/{N;s/^$/&=/}" filename
              

              

              
awk '{if(((length($1)>3)&& ($1 ~ /cat/))||($0~/^$/)){print $0}}' filename





              share|improve this answer




























                0














                I tried with below command



                sed -r "/cat/{N;s/^$/&=/}" filename
                

                

                
awk '{if(((length($1)>3)&& ($1 ~ /cat/))||($0~/^$/)){print $0}}' filename





                share|improve this answer


























                  0












                  0








                  0







                  I tried with below command



                  sed -r "/cat/{N;s/^$/&=/}" filename
                  

                  

                  
awk '{if(((length($1)>3)&& ($1 ~ /cat/))||($0~/^$/)){print $0}}' filename





                  share|improve this answer













                  I tried with below command



                  sed -r "/cat/{N;s/^$/&=/}" filename
                  

                  

                  
awk '{if(((length($1)>3)&& ($1 ~ /cat/))||($0~/^$/)){print $0}}' filename






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 1 hour ago









                  Praveen Kumar BSPraveen Kumar BS

                  1,366138




                  1,366138






























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