Whats does this mean Post: 49602

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Top Forums Shell Programming and Scripting Whats does this mean Post 49602 by Ygor on Tuesday 6th of April 2004 07:11:29 AM

04-06-2004

Registered User

from man ksh ...

Quote:

${parameter#pattern}
${parameter##pattern}
If the shell pattern matches the beginning of
the value of parameter, the value of this
substitution is the value of the parameter
with the matched portion deleted; otherwise
the value of this parameter substituted. In
the former case, the smallest matching
pattern is deleted; in the latter case, the
largest matching pattern is deleted.

${parameter%pattern}
${parameter%%pattern}
If the shell pattern matches the end of the
value of parameter, the value of parameter
with the matched part is deleted; otherwise
substitute the value of parameter. In the
former, the smallest matching pattern is
deleted; in the latter, the largest matching
pattern is deleted.

Some examples:

Code:

$ SRF="/path/to/file.ext"
$ echo ${SRF##*.}
ext
$ echo ${SRF%%.*}
/path/to/file
$ echo ${SRF##*/}
file.ext
$ echo ${SRF%/*}
/path/to

Ygor

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LEARN ABOUT DEBIAN

srf_list

srf_list(1)							   Staden io_lib						       srf_list(1)

NAME

       srf_list - Lists and/or counts the contents of an SRF file

SYNOPSIS

       srf_list  [options] srf_archive ...

DESCRIPTION

       srf_list  lists	the  filenames	held  within one or more SRF container.  To simply count the contents rather than list them specify the -c
       option. Note that when in count-only mode if an index is present it will be used to determine the number of entries in the index and  hence
       sequences  in the SRF file. The index cannot be used when listing the filenames however as the index itself does not contain the full file-
       names.

       Note that it is not possible to count sequences matching certain patterns or with specific flags set. srf_info is a  more  general  purpose
       tool that may cover this.

OPTIONS

       -c     Counts sequences instead of listing them. Note that this may be substantially faster than listing if an index exists.

       -v     Verbose mode. This gives summary count information per file rather than just the total at the end.

       -l     Long  format. When listing sequence names this also provides information on the position in the archive and the size of the sequence
	      specific data block and the size of the shared data block header.

EXAMPLES

       To count the total number of sequences in several SRF files:

	   srf_list -c *.srf

       To produce a "fofn" (file of filenames) for an SRF file:

	   srf_list foo.srf > foo.fofn

AUTHOR

       James Bonfield, Wellcome Trust Sanger Institute

								   September 29 						       srf_list(1)