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Full Discussion: Finding specific series of strings or characters
Top Forums UNIX for Dummies Questions & Answers Finding specific series of strings or characters Post 302562626 by ctsgnb on Friday 7th of October 2011 12:55:23 PM
Old 10-07-2011
Code:
nawk '/Seq/{x=$0;next}$0!~/[-*]/{print x RS $0}' infile

Code:
$ cat f1
>Sequence1
AGACAGATGACAGTAGACAGAT-GACGATAGCAGT
>Sequence2
AGACAGATGACAGTAGACAGATAGACGATAGCAGT
>Sequence3
AGACAGATGACAGTAGACAGATCGACGATAGCAGT
>Sequence4
AGACAGATGA-AGTAGACAGATTGACGATAGCAGT
>Sequence5
AGAC*GATGA


Code:
$ nawk '/Seq/{x=$0;next}$0!~/[-*]/{print x RS $0}' f1
>Sequence2
AGACAGATGACAGTAGACAGATAGACGATAGCAGT
>Sequence3
AGACAGATGACAGTAGACAGATCGACGATAGCAGT

few code explainations

nawk ' call awk
/Seq/if "Seq" pattern is found in the scanned line
{x=$0;save the line in variable x
next}skip further awk instructions and process next line from beginning of awk instructions
$0!~/[-*]/If no occurence of - or * is found in the scanned line
{print x RS $0}print the last Sequence scanned , a Record Separator ("\n" by default) , and the current scanned line
' <yourfile>name of the file that is passed to awk (argument)
Last edited by ctsgnb; 10-07-2011 at 02:08 PM..
This User Gave Thanks to ctsgnb For This Post:
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LEARN ABOUT OPENDARWIN

ucblinks

ucblinks(1B)					     SunOS/BSD Compatibility Package Commands					      ucblinks(1B)

NAME
       ucblinks - adds /dev entries to give SunOS 4.x compatible names to SunOS 5.x devices

SYNOPSIS
       /usr/ucb/ucblinks [-e rulebase] [-r rootdir]

DESCRIPTION
       ucblinks  creates symbolic links under the /dev directory for devices whose SunOS 5.x names differ from their SunOS 4.x names. Where possi-
       ble, these symbolic links point to the device's SunOS 5.x name rather than to the actual /devices entry.

       ucblinks does not remove unneeded compatibility links; these must be removed by hand.

       ucblinks should be called each time the system is reconfiguration-booted, after any new SunOS 5.x links that are needed have been  created,
       since the reconfiguration may have resulted in more compatibility names being needed.

       In  releases prior to SunOS 5.4, ucblinks used a  nawk rule-base to construct the SunOS 4.x compatible names. ucblinks no longer uses  nawk
       for the default operation, although  nawk rule-bases can still be specifed with the -e option.  The  nawk rule-base equivalent to the SunOS
       5.4 default operation can be found in /usr/ucblib/ucblinks.awk.

OPTIONS
       -e rulebase     Specify rulebase as the file containing nawk(1) pattern-action statements.

       -r rootdir      Specify rootdir as the directory under which dev and devices will be found, rather than the standard root directory /.

FILES
       /usr/ucblib/ucblinks.awk        sample rule-base for compatibility links

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       devlinks(1M), disks(1M), ports(1M), tapes(1M), attributes(5)

SunOS 5.10							    13 Apr 1994 						      ucblinks(1B)
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