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No - the correct formulation would be "When there is only 1 alias, which on top is the one being removed, the script can't find the anchor for the replacement".

---------- Post updated at 16:34...

Sorry for missing the rest of the input file. Try sed -e '/(SID_D/ {:L;N;/\n *)/bK;bL; :K;/alias2/d;/alias3_DGB/rINSERT.TXT' -e' }' file As it is difficult if not impossible to determine the very...

Might benefit from some fine tuning:awk '
/^tns_alias2/ {getline
L+=gsub (/\(/, "") - gsub (/\)/,"")
}

!L
L {L+=gsub (/\(/, "") - gsub...