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Top Forums Shell Programming and Scripting How to remove answers and explanation parts from a text file with lots of questions.? Post 303041669 by MadeInGermany on Monday 2nd of December 2019 02:32:34 AM
Old 12-02-2019
The task seems easy: delete the section between "Answer:" and "NO."
Doable with sed by means of the N command and a loop. But sed has a portability issue regarding N on the last line.
So awk is the first choice here.
Code:
awk '/^Answer:/{del=1} /^NO\./{del=0; print ""} del==0' test.txt

del==0 is true if del is not initialized. A true without action defaults to {print}.
This User Gave Thanks to MadeInGermany For This Post:
 

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IP-ADDRLABEL(8)                                                        Linux                                                       IP-ADDRLABEL(8)

NAME
ip-addrlabel - protocol address label management SYNOPSIS
ip addrlabel { COMMAND | help } ip addrlabel { add | del } prefix PREFIX [ dev DEV ] [ label NUMBER ] ip addrlabel { list | flush } DESCRIPTION
IPv6 address labels are used for address selection; they are described in RFC 3484. Precedence is managed by userspace, and only the label itself is stored in the kernel. ip addrlabel add - add an address label add an address label entry to the kernel. prefix PREFIX dev DEV the outgoing interface. label NUMBER the label for the prefix. 0xffffffff is reserved. ip addrlabel del - delete an address label delete an address label entry from the kernel. Arguments: coincide with the arguments of ip addrlabel add but the label is not required. ip addrlabel list - list address labels list the current address label entries in the kernel. ip addrlabel flush - flush address labels flush all address labels in the kernel. This does not restore any default settings. SEE ALSO
ip(8) AUTHOR
Manpage by Yoshifuji Hideaki / iproute2 20 Dec 2011 IP-ADDRLABEL(8)
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