Substring using cut/awk/sed Post: 302456404

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Top Forums Shell Programming and Scripting Substring using cut/awk/sed Post 302456404 by sumoka on Friday 24th of September 2010 06:55:20 AM

09-24-2010

Registered User

Hi ,

I have been trying various combinations of . & * but I have not yet completely understood how the placement of "." affects the o/p & can't use the [tag] sed [/tag] for this purpose very convincingly. following are some examples :

Code:

echo MPMTR20100706043000.txt|sed -n -e 's/\(..\)\(...\)\([0-9]\{8\}\)/\2,\1,\3,&/p'
MTR,MP,20100706,MPMTR20100706043000.txt

echo MPMTR20100701043000.txt|sed -n -e 's/\(..\)\(...\)\([0-9]\{8\}\)/\1,\2,\3,&/p'
MP,MTR,20100701,MPMTR20100701043000.txt

echo MPMTR20100706043000.txt|sed -n -e 's/\(..\)\(..\)\([0-9]\{8\}\)/\1,\2,\3,&/p'
MPM,TR,20100706,PMTR20100706043000.txt

echo MPMTR20100706043000.txt|sed -n -e 's/\(..\)\(.\)\([0-9]\{8\}\)/\1,\2,\3,&/p'
MPMT,R,20100706,MTR20100706043000.txt

echo MPMTR20100706043000.txt|sed -n -e 's/\(.\)\(..\)\([0-9]\{8\}\)/\1,\2,\3,&/p'
MPM,TR,20100706,MTR20100706043000.txt

echo MPMTR20100706043000.txt|sed -n -e 's/\(\)\(.\)\([0-9]\{8\}\)/\1,\2,\3,&/p'
MPMT,R,20100706,R20100706043000.txt

echo MPMTR20100706043000.txt|sed -n -e 's/\(\)\(\)\([0-9]\{8\}\)/\1,\2,\3,&/p'
MPMTR,,20100706,20100706043000.txt

can anyone please explain why the filename is getting clipped from left & why first field is not of 2 characters ?

Thanks!

sumoka

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LEARN ABOUT DEBIAN

x2sys_merge

X2SYS_MERGE(1gmt)					       Generic Mapping Tools						 X2SYS_MERGE(1gmt)

NAME

       x2sys_merge - Merge an updated COEs tables

SYNOPSIS

       x2sys_merge -Amain_COElist.d -Mnew_COElist.d

DESCRIPTION

       x2sys_merge  will read two crossovers data base and output the contents of the main one updated with the COEs in the second one. The second
       file should only contain updated COEs relatively to the first one.  That is, it MUST NOT contain any new  two  tracks  intersections  (This
       point  is  NOT checked in the code). This program is useful when, for any good reason like file editing NAV correction or whatever, one had
       to recompute only the COEs between the edited files and the rest of the database.

       -A     Specify the file main_COElist.d with the main crossover error data base.

       -M     Specify the file new_COElist.d with the newly computed crossover error data base.

OPTIONS

       No space between the option flag and the associated arguments.

       EXAMPLES
	      To update the main COE_data.txt with the new COEs estimations saved in the smaller COE_fresh.txt, try

	      x2sys_merge -ACOE_data.txt -MCOE_fresh.txt > COE_updated.txt

SEE ALSO

       x2sys_binlist(1), x2sys_cross(1), x2sys_datalist(1), x2sys_get(1), x2sys_init(1), x2sys_list(1), x2sys_put(1), x2sys_report(1)

GMT 4.5.7							    15 Jul 2011 						 X2SYS_MERGE(1gmt)

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