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Full Discussion: Cut out string in bash script
Top Forums Shell Programming and Scripting Cut out string in bash script Post 302397318 by durden_tyler on Sunday 21st of February 2010 08:27:49 PM
Old 02-21-2010
Quote:
Originally Posted by alister
...
That perl will not work if the trailing digit is not present or if there's a digit embedded elsewhere in the name. The latter may be unlikely, but the original query states that the digit is not always present.
...
Sorry, my bad.

Here's a file that contains variations of the URL, with the digit at the end, at the beginning, in between, and non-existent.

Code:
$ 
$ cat -n f6
     1  http://name5.domain.com:8000/file.dat
     2  http://na5me.domain.com:8000/file.dat
     3  http://5name.domain.com:8000/file.dat
     4  http://name.domain.com:8000/file.dat
$ 
$

Here's the Perl equivalent of your second awk script i.e. remove digit at the end (if present), but retain digit in-between or at the beginning (if present). Otherwise just fetch the word between "//" and "." that does not have any digits.

Code:
$ 
$ perl -lne '/http:\/\/(.*?)(\d)*\..*/ && print $_,"\t=>\t",$1' f6
http://name5.domain.com:8000/file.dat   =>      name
http://na5me.domain.com:8000/file.dat   =>      na5me
http://5name.domain.com:8000/file.dat   =>      5name
http://name.domain.com:8000/file.dat    =>      name
$ 
$

Since nothing has been mentioned about the case when the digit is at the beginning or in-between, I shall consider a couple of cases.

Case 1:
The digit at the beginning is to be removed.
The digit in-between has to be retained.
The digit at the end is to be removed.
Which means - "remove digits from the ends, retain it in the middle".

Code:
$ 
$ perl -lne '/http:\/\/(\d)*(.*?)(\d)*\..*/ && print $_,"\t=>\t",$2' f6
http://name5.domain.com:8000/file.dat   =>      name
http://na5me.domain.com:8000/file.dat   =>      na5me
http://5name.domain.com:8000/file.dat   =>      name
http://name.domain.com:8000/file.dat    =>      name
$

Case 2:
The digit at the beginning is to be removed.
The digit in-between has to be removed.
The digit at the end is to be removed.
Which means - "remove digits from the ends and the middle".

Code:
$ 
$ perl -lne 'if (/http:\/\/(\d)*(.*?)(\d)*\..*/){ ($x = $2) =~ s/\d//g; print $_,"\t=>\t",$x}' f6
http://name5.domain.com:8000/file.dat   =>      name
http://na5me.domain.com:8000/file.dat   =>      name
http://5name.domain.com:8000/file.dat   =>      name
http://name.domain.com:8000/file.dat    =>      name
$

tyler_durden
 

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LEARN ABOUT SUNOS

unknown

UNKNOWN(1)						      General Commands Manual							UNKNOWN(1)

NAME

       unknown - identify possible genotypes for unknowns

SYNOPSIS

       A program to rapidly identify which genotypes are possible for individuals typed as unknowns in the input pedigree.

       unknown [ -cl ]

DESCRIPTION

       unknown infers possible genotypes and mating combinations for parents with unknown genotypes for ilink(1), mlink(1) and linkmap(1).

OPTIONS

       -c     Use conditional allele frequencies.

       -l     Choose a good set of loop breakers automatically.

RETURN VALUE

       0     Successful completion

ERRORS

       10    File not found
       255   Failure

EXAMPLES

       Normally, unknown(1) is run immediately prior to its sister programs, ilink(1), mlink(1) and linkmap(1), like this:

       unknown
       mlink

FILES

       unknown(1) reads the two files pedfile.dat and datafile.dat as its own input and produces various temporary files that are used as input to
       the next program. These temporary files are ipedfile.dat, upedfile.dat, speedfile.dat and newspeedfile.dat.

NOTES

       unknown(1) is part of the FASTLINK package, which is a re-implementation of the LINKAGE suite  of  computer  tools  that  help  investigate
       genetic linkage as first proposed G.M. Lathrop, J.M. Lalouel, C. Julier, and J. Ott.

AUTHORS

       Dylan Cooper, Alejandro Schaffer, and Tony Schurtz based on work originally by Jurg Ott, Ph.D, et. al.

       This manual page was written by Elizabeth Barham <lizzy@soggytrousers.net> for the Debian GNU/Linux system (but may be used by others).

WORD-WIDE-WEB
       http://www.ncbi.nlm.nih.gov/CBBResearch/Schaffer/fastlink.html

SEE ALSO

       ilink(1), linkmap(1), lodscore(1), mlink(1).

								  April 15, 2003							UNKNOWN(1)
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