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ready. I have it.

Hello. I'm trying to delete the lines of a file does not contain the letter "T " (for example) at position 26.

So far, I could only print the result:
awk '{if (substr ($ 1,1,26)! ~ / T /)...

thanks!

Hello. I'm trying to insert text in various positions and I could only do that using pipes for each position.

Example:

cat file | sed -e 's#\(.\{5\}\)\(.*\)#\1:\2#g' | sed -e...