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Top Forums UNIX for Advanced & Expert Users creating directory error Post 302134734 by blowtorch on Monday 3rd of September 2007 08:28:39 AM
Old 09-03-2007
From the man page of bash,

Quote:
Special Parameters
The shell treats several parameters specially. These param-
eters may only be referenced; assignment to them is not
allowed.
@ Expands to the positional parameters, starting from
one. When the expansion occurs within double quotes,
each parameter expands to a separate word. That is,
"$@" is equivalent to "$1" "$2" ... When there are no
positional parameters, "$@" and $@ expand to nothing
(i.e., they are removed).
Your $@ is being "expanded to nothing". If you want to see how it works, run "set -x" and then run your mkdir command. You will then see that the mkdir command gets only "#$%" as args.

Run this in csh. "Variable syntax".
 

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shift(1)                                                           User Commands                                                          shift(1)

NAME
shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words SYNOPSIS
sh shift [n] csh shift [variable] ksh * shift [n] DESCRIPTION
sh The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1. csh The components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable not to be set or to have a null value. ksh The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can be any arithmetic expression that evaluates to a non-negative number less than or equal to $#. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 shift(1)
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