11-22-2008
Pl explain the shell script code
if [ ${1:-0} == "-r" ]
then
ROLLBACK=1 ;
elif [ ! "$packet" ]
then
echo "Nothing to install!" ;
echo "Exiting." ;
exit 0;
Plz explaing what is the ${1:-0} in if loop?
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SPLIT(1) FSF SPLIT(1)
NAME
split - split a file into pieces
SYNOPSIS
split [OPTION] [INPUT [PREFIX]]
DESCRIPTION
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default PREFIX is `x'. With no INPUT, or when INPUT is -, read standard
input.
Mandatory arguments to long options are mandatory for short options too.
-a, --suffix-length=N
use suffixes of length N (default 2)
-b, --bytes=SIZE
put SIZE bytes per output file
-C, --line-bytes=SIZE
put at most SIZE bytes of lines per output file
-l, --lines=NUMBER
put NUMBER lines per output file
--verbose
print a diagnostic to standard error just before each output file is opened
--help display this help and exit
--version
output version information and exit
SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.
AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for split is maintained as a Texinfo manual. If the info and split programs are properly installed at your site,
the command
info split
should give you access to the complete manual.
split (coreutils) 4.5.3 February 2003 SPLIT(1)