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simplified tab insertion

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edited Jun 10, 2014 at 16:51

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You could use sed as follows I think:

save the first line into the hold space
prepend an extra tab (column) from line #2 onward (this preserves the original column alignment of the header)
at a specified following line (I used line #4 in the example below), swap the hold back into pattern space, strip whitespace from it, and prepend it to the line

$ sed -e '1h' -e '2,$s/.*^/\t&\t/' -e '4{x;s/[[:space:]]//g;G;s/\n//}' file
                                CAT
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
    CAT         DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG

You could use sed as follows I think:

save the first line into the hold space
prepend an extra tab (column) from line #2 onward (this preserves the original column alignment of the header)
at a specified following line (I used line #4 in the example below), swap the hold back into pattern space, strip whitespace from it, and prepend it to the line

$ sed -e '1h' -e '2,$s/.*/\t&/' -e '4{x;s/[[:space:]]//g;G;s/\n//}' file
                                CAT
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
    CAT         DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG

You could use sed as follows I think:

save the first line into the hold space
prepend an extra tab (column) from line #2 onward (this preserves the original column alignment of the header)
at a specified following line (I used line #4 in the example below), swap the hold back into pattern space, strip whitespace from it, and prepend it to the line

$ sed -e '1h' -e '2,$s/^/\t/' -e '4{x;s/[[:space:]]//g;G;s/\n//}' file
                                CAT
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
    CAT         DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG

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answered Jun 10, 2014 at 15:35

steeldriver

83.8k
12
124
175

You could use sed as follows I think:

save the first line into the hold space
prepend an extra tab (column) from line #2 onward (this preserves the original column alignment of the header)
at a specified following line (I used line #4 in the example below), swap the hold back into pattern space, strip whitespace from it, and prepend it to the line

$ sed -e '1h' -e '2,$s/.*/\t&/' -e '4{x;s/[[:space:]]//g;G;s/\n//}' file
                                CAT
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG
    CAT         DOG     DOG     DOG     DOG     DOG     DOG     DOG
                DOG     DOG     DOG     DOG     DOG     DOG     DOG