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Full Discussion: Using awk or sed to find a pattern that has lines before and after it
Top Forums Shell Programming and Scripting Using awk or sed to find a pattern that has lines before and after it Post 302974121 by ran_bon_78 on Wednesday 25th of May 2016 06:39:21 PM
Old 05-25-2016
Using awk or sed to find a pattern that has lines before and after it
Dear gurus,
Please help this beginner to write and understand the required script. I am looking for useing awk for sed.

I have a few thousand lines file whose contain are mostly as below and I am trying to achieve followings.
1. Find a string, say user1. Then hash the line containing the string along with 2 lines before and 1 line after.
2. The script should not hast other lines like user10,11,12 etc.

The file looks like as below.
Code:
        start {
                UID 5001
                NAME  user1
                }
        start {
                UID 5002
                NAME  user2
                }
        start {
                UID 5003
                NAME  user3
                }
        start {
                UID 5004
                NAME  user4
                }
        start {
                UID 5005
                NAME  user5
                }
        start {
                UID 5006
                NAME  user6
                }
        start {
                UID 5007
                NAME  user7
                }
        start {
                UID 5008
                NAME  user8
                }
        start {
                UID 5009
                NAME  user9
                }
        start {
                UID 5010
                NAME  user10
                }
        start {
                UID 5011
                NAME  user11
                }
        start {
                UID 5012
                NAME  user12
                }
        start {
                UID 5013
                NAME  user13
                }
        start {
                UID 5014
                NAME  user14
                }
        start {
                UID 5015
                NAME  user15
                }
        start {
                UID 5016
                NAME  user16
                }
        start {
                UID 5017
                NAME  user17
                }
        start {
                UID 5018
                NAME  user18
                }
        start {
                UID 5019
                NAME  user19
                }
        start {
                UID 5020
                NAME  user20
                }

Thanks in advance
Randy
Last edited by Scott; 05-25-2016 at 08:15 PM.. Reason: Please use code tags
 

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LEARN ABOUT SUSE

setresuid

SETRESUID(2)						     Linux Programmer's Manual						      SETRESUID(2)

NAME

       setresuid, setresgid - set real, effective and saved user or group ID

SYNOPSIS

       #define _GNU_SOURCE
       #include <unistd.h>

       int setresuid(uid_t ruid, uid_t euid, uid_t suid);
       int setresgid(gid_t rgid, gid_t egid, gid_t sgid);

DESCRIPTION

       setresuid() sets the real user ID, the effective user ID, and the saved set-user-ID of the calling process.

       Unprivileged  user  processes may change the real UID, effective UID, and saved set-user-ID, each to one of: the current real UID, the cur-
       rent effective UID or the current saved set-user-ID.

       Privileged processes (on Linux, those having the CAP_SETUID capability) may set the real UID, effective UID, and saved set-user-ID to arbi-
       trary values.

       If one of the arguments equals -1, the corresponding value is not changed.

       Regardless  of  what  changes are made to the real UID, effective UID, and saved set-user-ID, the file system UID is always set to the same
       value as the (possibly new) effective UID.

       Completely analogously, setresgid() sets the real GID, effective GID, and saved set-group-ID of the calling process  (and  always  modifies
       the file system GID to be the same as the effective GID), with the same restrictions for unprivileged processes.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       EAGAIN uid does not match the current UID and this call would bring that user ID over its RLIMIT_NPROC resource limit.

       EPERM  The  calling  process  is not privileged (did not have the CAP_SETUID capability) and tried to change the IDs to values that are not
	      permitted.

VERSIONS

       These calls are available under Linux since Linux 2.1.44.

CONFORMING TO

       These calls are nonstandard; they also appear on HP-UX and some of the BSDs.

NOTES

       Under HP-UX and FreeBSD the prototype is found in <unistd.h>.  Under Linux the prototype is provided by glibc since version 2.3.2.

SEE ALSO

       getresuid(2), getuid(2), setfsgid(2), setfsuid(2), setreuid(2), setuid(2), capabilities(7), credentials(7), feature_test_macros(7)

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2007-07-26							      SETRESUID(2)
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