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You can reach a good-enough result by using temporary files: my_file=file.txt #or =$1 if in a script #create a file with all the lines to discard, numbered grep -n -B1 -A5 TBD "$my_file" |cut -d\ -f1|tr -d ':-'|sort > /tmp/___"$my_file"_unpair #number all the lines nl -nln "$my_file"|cut -d\ -f1|tr -d ':-'|sort > /tmp/___"$my_file"_all #join the ...


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My El Capitan has no setattr or setxattr (the latter is the name of a C runtime function: you could make your own utility using that). OSX provides xattr, which (noting comments such as Mac OS X Extended Attributes and Xattr) seems fairly recent. A comment in Manually set extended attributes on arbitrary files from 2011 gives a hint about OSX 10.5 You can ...



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