06-07-2016
Quote:
Originally Posted by
xeccc5z
RavinderSingh13
Thanks for your response and since I am new this I may missed out the rules and i will do it from now on
And my query is I am passing file names as command line arguments and my condition should alert the user if he fails to pass the parameter
am saving those parameters in a variable called file1, file2 and file3
i believe [ -z file ] will check whether file is a zero size file or not , correct me if iam wrong
Hello xeccc5z,
You welcome, you could hit THANKS button at left side of any post for any useful post to a person. Yes, for NULL values it should work.
Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
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getopt(1) General Commands Manual getopt(1)
NAME
getopt - parse command options
SYNOPSIS
optstring args
DESCRIPTION
is used to break up options in command lines for easy parsing by shell procedures and to check for legal options. optstring is a string of
recognized option letters (see getopt(3C)). If a letter is followed by a colon, the option is expected to have an argument, which may or
may not be separated from it by whitespace.
The positional parameters ...) of the shell are reset so that each option is preceded by a and is in its own positional parameter; each
option argument is also parsed into its own positional parameter.
recognizes two hyphens to delimit the end of the options. If absent, places at the end of the options.
The most common use of is in the shell's command (see the example below) where converts the command line to a more easily parsed form.
writes the modified command line to the standard output.
EXTERNAL INFLUENCES
Environment Variables
determines the language in which messages are displayed.
If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari-
able.
If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable
contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5).
International Code Set Support
Single-byte and multibyte character code sets are supported.
DIAGNOSTICS
prints an error message on the standard error when it encounters an option letter that is not included in optstring.
EXAMPLES
The following code fragment processes the arguments for a command that can take the options or and the option which requires an argument:
This code accepts any of the following as equivalent:
WARNINGS
option arguments must not be null strings nor contain embedded blanks.
SEE ALSO
getopts(1), sh(1), getopt(3C).
getopt(1)