04-06-2004
Whats does this mean
Found this piece of code written in ksh. I have no ideas what do the stuff like ${SRF##*\.} do.
SUFFIX=${SRF##*\.}
if [ "$SUFFIX" = "${SRF}" ]; then
SUFFIX=""
fi
I have encountered similar expressions in other programs also. Any pointers on where to learn more about these strange expressions would be really helpful.
Thanks,
JP
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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
AUTHOR
Written by Jim Meyering and Paul Eggert.
REPORTING BUGS
Report sleep bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report sleep translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2011 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 8.12.197-032bb September 2011 SLEEP(1)