05-08-2005
You could do this by specifying a check sum in your getopts statement. At the end of the getsopts statement and before any other code is executed, check to see if the checksum value is what is expected. Here is a
thread that you could use to show you how to go about it.
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1. Shell Programming and Scripting
hey
need help with getopts again.
i am using getopts to read my command line options and arguments. i can manage to do for options that have only one argument
e.g srcipt_name -f 3
i am able to use getopts to do this but i am having problems two accept more than two agruments
e.g.... (1 Reply)
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Hi
i have part of the scripts below ,getopt for -h or ? not working for me.
can anybody tell me if this sytax right or wrong.
#!/usr/bin/ksh
program=$(basename $0)
#####################################################################################
function usageerr
{
RC=1
... (3 Replies)
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Hi,
My script will take a input file as a parameter(which is not mandatory) and also an option.
ksh my_script.sh <inputfile>
The option -n I have given is no way related to the input file.
Now the problem here is when i execute the script specifying the input file and the option(the way... (4 Replies)
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I am having some trouble/questions with getopts that I can't find any solid info on with google
I need it to parse things of the syntax of:
-r # # # -f -c
with as many repeats as possible, and it should catch erroneous commands also, but continue going...
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Hey, i need help with the use of getopts in shell script.
tried reading a lot online, but found incomplete examples (maybe complete but cudn't make out). PLzz help...explain in deatil plzzz, i am a newbie:confused: (3 Replies)
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First off, I apologize for my lack of knowledge. I realize my problem will probably seem pretty basic to everyone, but I've been at this for several hours now and I've gotten nowhere. I would contact my professor, but it is too late for that.
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7. Shell Programming and Scripting
Suppose I have a code below .
while getopts a: opt
do
case $opt in
a) app_name="$OPTARG";;
*) echo "$opt is an invalid option";
exit 1;;
?) echo "The value of $OPTARG is an invalid option";
exit 1;;
esac
done
Could anyone please tell me in which case my... (1 Reply)
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Hi all...
I have been looking on here for the past few days for an answer and Im gonna have to break down and ask.
I just learned about the getopts command last week so have been trying to utilize it in my scripts.
Below, I am trying to set up a case structure for options using getopts.... (1 Reply)
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while getopts v OPTION
do
case $OPTION in
v) echo "Hello" ;;
*) exit 1;;
esac
done
Suppose I have script tmp.sh
Whose Signature is tmp.sh <fixed_argument>
When I run the script with tmp.sh -v "file", it echoes a hello but, when I try the other way i.e, tmp.sh... (1 Reply)
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10. Shell Programming and Scripting
Hi All,
I am writing a script to pass the getopts argument to the function which I have. But it as soon as I execute the script, the argument is taking it as blank. I tried using multiple way to check but its not working.
Can someone please let me know what wrong in this code.
function1()... (4 Replies)
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sum(n) Cyclic Redundancy Checks sum(n)
__________________________________________________________________________________________________________________________________________________
NAME
sum - Calculate a sum(1) compatible checksum
SYNOPSIS
package require Tcl 8.2
package require sum ?1.1.0?
::crc::sum ?-bsd | -sysv? ?-format fmt? ?-chunksize size? [ -filename file | -channel chan | string ]
_________________________________________________________________
DESCRIPTION
This package provides a Tcl-only implementation of the sum(1) command which calculates a 16 bit checksum value from the input data. The
BSD sum algorithm is used by default but the SysV algorithm is also available.
COMMANDS
::crc::sum ?-bsd | -sysv? ?-format fmt? ?-chunksize size? [ -filename file | -channel chan | string ]
The command takes string data or a file name or a channel and returns a checksum value calculated using the sum(1) algorithm. The
result is formatted using the format(n) specifier provided or as an unsigned integer (%u) by default.
OPTIONS
-sysv The SysV algorithm is fairly naive. The byte values are summed and any overflow is discarded. The lowest 16 bits are returned as the
checksum. Input with the same content but different ordering will give the same result.
-bsd This algorithm is similar to the SysV version but includes a bit rotation step which provides a dependency on the order of the data
values.
-filename name
Return a checksum for the file contents instead of for parameter data.
-channel chan
Return a checksum for the contents of the specified channel. The channel must be open for reading and should be configured for
binary translation. The channel will no be closed on completion.
-chunksize size
Set the block size used when reading data from either files or channels. This value defaults to 4096.
-format string
Return the checksum using an alternative format template.
EXAMPLES
% crc::sum "Hello, World!"
37287
% crc::sum -format 0x%X "Hello, World!"
0x91A7
% crc::sum -file sum.tcl
13392
AUTHORS
Pat Thoyts
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category crc of
the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for
either package and/or documentation.
SEE ALSO
cksum(n), crc32(n), sum(1)
KEYWORDS
checksum, cksum, crc, crc32, cyclic redundancy check, data integrity, security, sum
CATEGORY
Hashes, checksums, and encryption
COPYRIGHT
Copyright (c) 2002, Pat Thoyts <patthoyts@users.sourceforge.net>
crc 1.1.0 sum(n)