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 CENTOS

sleep

SLEEP(1)							   User Commands							  SLEEP(1)

NAME

       sleep - delay for a specified amount of time

SYNOPSIS

       sleep NUMBER[SUFFIX]...
       sleep OPTION

DESCRIPTION

       Pause for NUMBER seconds.  SUFFIX may be 's' for seconds (the default), 'm' for minutes, 'h' for hours or 'd' for days.	Unlike most imple-
       mentations that require NUMBER be an integer, here NUMBER may be an arbitrary floating point number.  Given two or  more  arguments,  pause
       for the amount of time specified by the sum of their values.

       --help display this help and exit

       --version
	      output version information and exit

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report sleep translation bugs to <http://translationproject.org/team/>

AUTHOR

       Written by Jim Meyering and Paul Eggert.

COPYRIGHT

       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       sleep(3)

       The  full  documentation  for sleep is maintained as a Texinfo manual.  If the info and sleep programs are properly installed at your site,
       the command

	      info coreutils 'sleep invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								  SLEEP(1)