(Gnu) sed command to change a matching part of a line





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Is there a way in (Gnu) sed to replace all characters in a matching part of a string? For example I might have a list of file paths with several (arbitrary number of) paths in each line, e.g.:



/a/b/c/d/e /f/g/XXX/h/i /j/k/l/m
/n/o/p /q/r/s/t/u /v/x/x/y
/z/XXX/a/b /c/d/e/f


I would like to replace all the slashes in paths containing XXX keping all the others untouched, e.g.:



/a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
/n/o/p /q/r/s/t/u /v/x/x/y
#z#XXX#a#b /c/d/e/f


Unfortunately I cannot come up with a solution. Maybe it's even impossible with sed. But I'm curious if somebody find a way to solve the problem.










share|improve this question





























    0















    Is there a way in (Gnu) sed to replace all characters in a matching part of a string? For example I might have a list of file paths with several (arbitrary number of) paths in each line, e.g.:



    /a/b/c/d/e /f/g/XXX/h/i /j/k/l/m
    /n/o/p /q/r/s/t/u /v/x/x/y
    /z/XXX/a/b /c/d/e/f


    I would like to replace all the slashes in paths containing XXX keping all the others untouched, e.g.:



    /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
    /n/o/p /q/r/s/t/u /v/x/x/y
    #z#XXX#a#b /c/d/e/f


    Unfortunately I cannot come up with a solution. Maybe it's even impossible with sed. But I'm curious if somebody find a way to solve the problem.










    share|improve this question

























      0












      0








      0








      Is there a way in (Gnu) sed to replace all characters in a matching part of a string? For example I might have a list of file paths with several (arbitrary number of) paths in each line, e.g.:



      /a/b/c/d/e /f/g/XXX/h/i /j/k/l/m
      /n/o/p /q/r/s/t/u /v/x/x/y
      /z/XXX/a/b /c/d/e/f


      I would like to replace all the slashes in paths containing XXX keping all the others untouched, e.g.:



      /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
      /n/o/p /q/r/s/t/u /v/x/x/y
      #z#XXX#a#b /c/d/e/f


      Unfortunately I cannot come up with a solution. Maybe it's even impossible with sed. But I'm curious if somebody find a way to solve the problem.










      share|improve this question














      Is there a way in (Gnu) sed to replace all characters in a matching part of a string? For example I might have a list of file paths with several (arbitrary number of) paths in each line, e.g.:



      /a/b/c/d/e /f/g/XXX/h/i /j/k/l/m
      /n/o/p /q/r/s/t/u /v/x/x/y
      /z/XXX/a/b /c/d/e/f


      I would like to replace all the slashes in paths containing XXX keping all the others untouched, e.g.:



      /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
      /n/o/p /q/r/s/t/u /v/x/x/y
      #z#XXX#a#b /c/d/e/f


      Unfortunately I cannot come up with a solution. Maybe it's even impossible with sed. But I'm curious if somebody find a way to solve the problem.







      sed






      share|improve this question













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      share|improve this question










      asked Nov 16 '18 at 15:13









      bmkbmk

      11.4k43036




      11.4k43036
























          1 Answer
          1






          active

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          2














          We can replace any / preceding XXX with no intervening spaces like this:



          # Using extended regex syntax
          s!/([^ ]*XXX)!#1!


          It's a very similar substitution for those that follow XXX.



          Putting them together in a loop makes this program:



          #!/bin/sed -rf

          :loop
          s!/([^ ]*XXX)!#1!
          s!(XXX[^ ]*)/!1#!
          tloop


          Output:



          /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
          /n/o/p /q/r/s/t/u /v/x/x/y
          #z#XXX#a#b /c/d/e/f




          That said, it might be simpler to use a pipeline, to break the file paths into individual lines and then reassemble them after the substitution:



          sed -e 's/ *$//;s/  */&n/g' 
          | sed -e '/XXX/y,/,#,'
          | sed -e ':a;/ $/{N;s/n//;ba}'





          share|improve this answer


























          • These are interesting solutions that work for me that way. Thank you.

            – bmk
            Nov 19 '18 at 9:36












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          1 Answer
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          active

          oldest

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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          We can replace any / preceding XXX with no intervening spaces like this:



          # Using extended regex syntax
          s!/([^ ]*XXX)!#1!


          It's a very similar substitution for those that follow XXX.



          Putting them together in a loop makes this program:



          #!/bin/sed -rf

          :loop
          s!/([^ ]*XXX)!#1!
          s!(XXX[^ ]*)/!1#!
          tloop


          Output:



          /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
          /n/o/p /q/r/s/t/u /v/x/x/y
          #z#XXX#a#b /c/d/e/f




          That said, it might be simpler to use a pipeline, to break the file paths into individual lines and then reassemble them after the substitution:



          sed -e 's/ *$//;s/  */&n/g' 
          | sed -e '/XXX/y,/,#,'
          | sed -e ':a;/ $/{N;s/n//;ba}'





          share|improve this answer


























          • These are interesting solutions that work for me that way. Thank you.

            – bmk
            Nov 19 '18 at 9:36
















          2














          We can replace any / preceding XXX with no intervening spaces like this:



          # Using extended regex syntax
          s!/([^ ]*XXX)!#1!


          It's a very similar substitution for those that follow XXX.



          Putting them together in a loop makes this program:



          #!/bin/sed -rf

          :loop
          s!/([^ ]*XXX)!#1!
          s!(XXX[^ ]*)/!1#!
          tloop


          Output:



          /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
          /n/o/p /q/r/s/t/u /v/x/x/y
          #z#XXX#a#b /c/d/e/f




          That said, it might be simpler to use a pipeline, to break the file paths into individual lines and then reassemble them after the substitution:



          sed -e 's/ *$//;s/  */&n/g' 
          | sed -e '/XXX/y,/,#,'
          | sed -e ':a;/ $/{N;s/n//;ba}'





          share|improve this answer


























          • These are interesting solutions that work for me that way. Thank you.

            – bmk
            Nov 19 '18 at 9:36














          2












          2








          2







          We can replace any / preceding XXX with no intervening spaces like this:



          # Using extended regex syntax
          s!/([^ ]*XXX)!#1!


          It's a very similar substitution for those that follow XXX.



          Putting them together in a loop makes this program:



          #!/bin/sed -rf

          :loop
          s!/([^ ]*XXX)!#1!
          s!(XXX[^ ]*)/!1#!
          tloop


          Output:



          /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
          /n/o/p /q/r/s/t/u /v/x/x/y
          #z#XXX#a#b /c/d/e/f




          That said, it might be simpler to use a pipeline, to break the file paths into individual lines and then reassemble them after the substitution:



          sed -e 's/ *$//;s/  */&n/g' 
          | sed -e '/XXX/y,/,#,'
          | sed -e ':a;/ $/{N;s/n//;ba}'





          share|improve this answer















          We can replace any / preceding XXX with no intervening spaces like this:



          # Using extended regex syntax
          s!/([^ ]*XXX)!#1!


          It's a very similar substitution for those that follow XXX.



          Putting them together in a loop makes this program:



          #!/bin/sed -rf

          :loop
          s!/([^ ]*XXX)!#1!
          s!(XXX[^ ]*)/!1#!
          tloop


          Output:



          /a/b/c/d/e #f#g#XXX#h#i /j/k/l/m
          /n/o/p /q/r/s/t/u /v/x/x/y
          #z#XXX#a#b /c/d/e/f




          That said, it might be simpler to use a pipeline, to break the file paths into individual lines and then reassemble them after the substitution:



          sed -e 's/ *$//;s/  */&n/g' 
          | sed -e '/XXX/y,/,#,'
          | sed -e ':a;/ $/{N;s/n//;ba}'






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 16 '18 at 15:59

























          answered Nov 16 '18 at 15:48









          Toby SpeightToby Speight

          17.5k134469




          17.5k134469













          • These are interesting solutions that work for me that way. Thank you.

            – bmk
            Nov 19 '18 at 9:36



















          • These are interesting solutions that work for me that way. Thank you.

            – bmk
            Nov 19 '18 at 9:36

















          These are interesting solutions that work for me that way. Thank you.

          – bmk
          Nov 19 '18 at 9:36





          These are interesting solutions that work for me that way. Thank you.

          – bmk
          Nov 19 '18 at 9:36




















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