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Full Discussion: What does "!{$!..." means in sed ?
Top Forums Shell Programming and Scripting What does "!{$!..." means in sed ? Post 302993259 by bakunin on Wednesday 8th of March 2017 05:05:59 AM
Old 03-08-2017
Quote:
Originally Posted by ade05fr@yahoo.f
i have this command but i have some difficulty to understand it
Generally: commands in one-liner style do not enhance the readability all too much. If you don't understand it it is a good idea to first write it out, like i have done:


Code:
sed -n '/{/ ! b          # Line rule ("!"=NOTted): if line (not) contains "{", branch
        :a               # target for branching
        /}/ ! {          # line rule (NOTted again): if line (not) contains "}" do
              $ ! {      # line rule (NOTted again): if line is (not) the last line, do
                    N    # append next line to pattern space
                    ba   # branch to target a (see above, line 2)
                  }
              }
        {                # i don't understand this bracket
            /}/p         # line rule: if line contains "}" print it
        }' test.trc

I hope this helps.

bakunin
These 3 Users Gave Thanks to bakunin For This Post:
durden_tyler jim mcnamara RavinderSingh13
 

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LEARN ABOUT SUSE

audit_add_rule_data

AUDIT_ADD_RULE_DATA(3)						  Linux Audit API					    AUDIT_ADD_RULE_DATA(3)

NAME

       audit_add_rule_data - Add new audit rule

SYNOPSIS

       #include <libaudit.h>

       int audit_add_rule_data (int fd, struct audit_rule_data *rule, int flags, int action);

DESCRIPTION

       audit_add_rule adds an audit rule previously constructed with audit_rule_fieldpair_data(3) to one of several kernel event filters. The fil-
       ter is specified by the flags argument. Possible values for flags are:

       o  AUDIT_FILTER_USER - Apply rule to userspace generated messages.

       o  AUDIT_FILTER_TASK - Apply rule at task creation (not syscall).

       o  AUDIT_FILTER_EXIT - Apply rule at syscall exit.

       o  AUDIT_FILTER_TYPE - Apply rule at audit_log_start.

       The rule's action has two possible values:

       o  AUDIT_NEVER - Do not build context if rule matches.

       o  AUDIT_ALWAYS - Generate audit record if rule matches.

RETURN VALUE

       The return value is <= 0 on error, otherwise it is the netlink sequence id number. This function can  have  any	error  that  sendto  would
       encounter.

SEE ALSO

       audit_rule_fieldpair_data(3), audit_delete_rule_data(3), auditctl(8).

AUTHOR

       Steve Grubb.

Red Hat 							     Aug 2009						    AUDIT_ADD_RULE_DATA(3)
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