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Full Discussion: Add a line after last matched expression
Top Forums UNIX for Advanced & Expert Users Add a line after last matched expression Post 302691849 by Lem on Sunday 26th of August 2012 04:39:23 AM
Old 08-26-2012
Quote:
Originally Posted by complex.invoke
Code:
sed '${/^ACL localnet/{s/.*/&\nMy Network 192.168.1.1/}}' infile

This will work only if the last line of the file begins with "ACL localnet". Smilie
But in this case an echo "My Network 192.168.1.1" >> file would be enough.

The OP wants to insert a line after the last occurrence, in the file, of a line beginning with "ACL localnet". This last occurrence may be everywhere in the file.

The solution I posted above works well (I wrote it for bash), but I suggested not to use it because of the trick of deleting the file before rewriting it and having it only in RAM for a while, which would end up in a loss of data in case of a system crash.

However:
Code:
lem@biggy:/tmp$ line=$(sed -n '/^ACL localnet/ =' file |tail -n1)
lem@biggy:/tmp$ (( ${line:-0} == 0 )) || sed  "$line a\
My Network 192.168.1.1" <file >newfile

(after "$line a\" press ENTER)
is perfectly safe. Smilie
--
Bye
 

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LEARN ABOUT DEBIAN

aclcheck

aclcheck(3SEC)                                         File Access Control Library Functions                                        aclcheck(3SEC)

NAME

       aclcheck - check the validity of an ACL

SYNOPSIS

       cc [ flag... ] file... -lsec [ library... ]
       #include <sys/acl.h>

       int aclcheck(aclent_t *aclbufp, int nentries, int *which);

DESCRIPTION

       The  aclcheck()  function  checks the validity of an ACL pointed to by aclbufp. The nentries argument is the number of entries contained in
       the buffer. The which parameter returns the index of the first entry that is invalid.

       The function verifies that an ACL pointed to by aclbufp is valid according to the following rules:

         o  There must be exactly one GROUP_OBJ ACL entry.

         o  There must be exactly one USER_OBJ ACL entry.

         o  There must be exactly one OTHER_OBJ ACL entry.

         o  If there are any GROUP ACL entries, then the group ID in each group ACL entry must be unique.

         o  If there are any USER ACL entries, then the user ID in each user ACL entry must be unique.

         o  If there are any GROUP or USER ACL entries, then there must be exactly one CLASS_OBJ (ACL mask) entry.

         o  If there are any default ACL entries, then the following apply:

              o  There must be exactly one default GROUP_OBJ ACL entry.

              o  There must be exactly one default OTHER_OBJ ACL entry.

              o  There must be exactly one default USER_OBJ ACL entry.

              o  If there are any DEF_GROUP entries, then the group ID in each DEF_GROUP ACL entry must be unique.

              o  If there are any DEF_USER entries, then the user ID in each DEF_USER ACL entry must be unique.

              o  If there are any DEF_GROUP or DEF_USER entries, then there must be exactly one DEF_CLASS_OBJ (default ACL mask) entry.

         o  If any of the above rules are violated, then the function fails with errno set to  EINVAL.

RETURN VALUES

       If the ACL is valid, alcheck() will return 0. Otherwise  errno is set to EINVAL and return code is set to one of the following:

       GRP_ERROR               There is more than one GROUP_OBJ or DEF_GROUP_OBJ ACL entry.

       USER_ERROR              There is more than one USER_OBJ or DEF_USER_OBJ ACL entry.

       CLASS_ERROR             There is more than one CLASS_OBJ (ACL mask) or DEF_CLASS_OBJ (default ACL mask) entry.

       OTHER_ERROR             There is more than one OTHER_OBJ or DEF_OTHER_OBJ ACL entry.

       DUPLICATE_ERROR         Duplicate entries of USER, GROUP, DEF_USER, or DEF_GROUP.

       ENTRY_ERROR             The entry type is invalid.

       MISS_ERROR              Missing an entry. The which parameter returns -1 in this case.

       MEM_ERROR               The system cannot allocate any memory. The which parameter returns -1 in this case.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+
       |MT-Level                     |Unsafe                       |
       +-----------------------------+-----------------------------+

SEE ALSO

       acl(2), aclsort(3SEC), attributes(5)

SunOS 5.10                                                          10 Dec 2001                                                     aclcheck(3SEC)
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