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Top Forums Shell Programming and Scripting Question about argument parsing in scripts Post 302454697 by agama on Sunday 19th of September 2010 09:47:23 PM
Old 09-19-2010
The expansion of the contents of "$@", "$*", and $* are different, which results in the differing results. Assuming that a "b c" d e was entered on the command line, then "$@" results in this expansion on the for loop (quoting from the command line is preserved):

Code:
 for  x in  a "b c" d e

while "$*" results in:

Code:
 for x in "a b c d e"

Here the command line arguments are converted to a single token and thus the loop executes only once with "a b c d" assigned to x.

For the last example, $* (no quotes) evaluates to just a b c d on the loop statement (quoting from the command line is not preserved) and thus the loop is executed one time for each and thus each is presented on a separate line.

Hope this makes it more clear.
 

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continue(1T)						       Tcl Built-In Commands						      continue(1T)

__________________________________________________________________________________________________________________________________________________

NAME
continue - Skip to the next iteration of a loop SYNOPSIS
continue _________________________________________________________________ DESCRIPTION
This command is typically invoked inside the body of a looping command such as for or foreach or while. It returns a TCL_CONTINUE code, which causes a continue exception to occur. The exception causes the current script to be aborted out to the innermost containing loop command, which then continues with the next iteration of the loop. Catch exceptions are also handled in a few other situations, such as the catch command and the outermost scripts of procedure bodies. EXAMPLE
Print a line for each of the integers from 0 to 10 except 5: for {set x 0} {$x<10} {incr x} { if {$x == 5} { continue } puts "x is $x" } SEE ALSO
break(1T), for(1T), foreach(1T), return(1T), while(1T) KEYWORDS
continue, iteration, loop ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTcl | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tcl is available on http://opensolaris.org. Tcl continue(1T)
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