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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tcl_stringmatch

Tcl_StringMatch(3)					      Tcl Library Procedures						Tcl_StringMatch(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_StringMatch, Tcl_StringCaseMatch - test whether a string matches a pattern

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_StringMatch(str, pattern)

       int
       Tcl_StringCaseMatch(str, pattern, flags)

ARGUMENTS

       const char *str (in)		 String to test.

       const char *pattern (in) 	 Pattern to match against string.  May contain special characters from the set *?[].

       int flags (in)			 OR-ed combination of match flags, currently only TCL_MATCH_NOCASE.  0 specifies a case-sensitive search.
_________________________________________________________________

DESCRIPTION

       This  utility  procedure  determines  whether  a  string  matches  a given pattern.  If it does, then Tcl_StringMatch returns 1.  Otherwise
       Tcl_StringMatch returns 0.  The algorithm used for matching is the same algorithm used in the string match Tcl command and  is  similar	to
       the algorithm used by the C-shell for file name matching;  see the Tcl manual entry for details.

       In  Tcl_StringCaseMatch,  the algorithm is the same, but you have the option to make the matching case-insensitive.  If you choose this (by
       passing TCL_MATCH_NOCASE), then the string and pattern are essentially matched in the lower case.

KEYWORDS

       match, pattern, string

Tcl									8.5							Tcl_StringMatch(3)