08-25-2010
Quote:
Originally Posted by
agama
Did you notice that there is a missing double quote on the last echo in the script? I would have expected you to have seen an error, but the behaviour might be exactly as you described all caused by the missing quote.
Spot on, agama. I ran it with the fixed (?!) variables and such on a much smaller folder of files than I was "playing it on" before, and first thing to come up was "syntax error -- unexpected end of file." I cat'ed and immediately saw the missing double-quote.
Never let it be said that coloured syntax formatting in a GUI text editor is an unqualified benefit -- sometimes the eye is so enwrapt in the colours that the mind is rendered blind to the errors staring one straight in the face!
Quote:
Originally Posted by agama
I don't know why it wouldn't toss an error to stderr, but if it isn't, or stderr is being redirected (I don't think you are), then it would appear not to be executing the commands after the done.
My bad there. I had stderr going out to /dev/null, anticipating that the only errors I'd have seen in stdout would have been related to the files "punch branded" by PhotoFiltre or some other maker-related error. I didn't see the eof error for that reason. It's not like BASH exactly allows one to pick and choose which kind, app error or shell syntax error, one gets to redirect (or is it? I certainly haven't seen any how-to's on this score). And even the author, Andreas Huggel, says error trapping in his app needs some looking at -- presently all you get is what the error/s is/are, not what file tossed them up. It's a matter of "feeding protein" to the -V option or a more file-conscientious rewrite of the whole error-reporting section of the code. No news yet as to whether Hr Huggel has made headway.
I made the fix, and tried again. It ran beautifully. Now, paradoxically, I'm thinking a better "cure" for PhotoFiltre EXIF software "branding" tags might not be to purge them, but to erase and rewrite them in the way that won't habitually create an error call in Exiv2. Ideally such a script would sync with a query at the top (return value of same stored in a variable) to the
registry asking for the exact version number of PF right down to the build string. But that's a whole other lunch date,.
Thanks again for the help.
BZT
Last edited by SilversleevesX; 08-25-2010 at 06:54 AM..
Reason: Wrong helper's name - corrected.
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subst(3tcl) Tcl Built-In Commands subst(3tcl)
__________________________________________________________________________________________________________________________________________________
NAME
subst - Perform backslash, command, and variable substitutions
SYNOPSIS
subst ?-nobackslashes? ?-nocommands? ?-novariables? string
_________________________________________________________________
DESCRIPTION
This command performs variable substitutions, command substitutions, and backslash substitutions on its string argument and returns the
fully-substituted result. The substitutions are performed in exactly the same way as for Tcl commands. As a result, the string argument
is actually substituted twice, once by the Tcl parser in the usual fashion for Tcl commands, and again by the subst command.
If any of the -nobackslashes, -nocommands, or -novariables are specified, then the corresponding substitutions are not performed. For
example, if -nocommands is specified, command substitution is not performed: open and close brackets are treated as ordinary characters
with no special interpretation.
Note that the substitution of one kind can include substitution of other kinds. For example, even when the -novariables option is speci-
fied, command substitution is performed without restriction. This means that any variable substitution necessary to complete the command
substitution will still take place. Likewise, any command substitution necessary to complete a variable substitution will take place, even
when -nocommands is specified. See the EXAMPLES below.
If an error occurs during substitution, then subst will return that error. If a break exception occurs during command or variable substi-
tution, the result of the whole substitution will be the string (as substituted) up to the start of the substitution that raised the excep-
tion. If a continue exception occurs during the evaluation of a command or variable substitution, an empty string will be substituted for
that entire command or variable substitution (as long as it is well-formed Tcl.) If a return exception occurs, or any other return code is
returned during command or variable substitution, then the returned value is substituted for that substitution. See the EXAMPLES below.
In this way, all exceptional return codes are "caught" by subst. The subst command itself will either return an error, or will complete
successfully.
EXAMPLES
When it performs its substitutions, subst does not give any special treatment to double quotes or curly braces (except within command sub-
stitutions) so the script
set a 44
subst {xyz {$a}}
returns "xyz {44}", not "xyz {$a}" and the script
set a "p} q {r"
subst {xyz {$a}}
returns "xyz {p} q {r}", not "xyz {p} q {r}".
When command substitution is performed, it includes any variable substitution necessary to evaluate the script.
set a 44
subst -novariables {$a [format $a]}
returns "$a 44", not "$a $a". Similarly, when variable substitution is performed, it includes any command substitution necessary to
retrieve the value of the variable.
proc b {} {return c}
array set a {c c [b] tricky}
subst -nocommands {[b] $a([b])}
returns "[b] c", not "[b] tricky".
The continue and break exceptions allow command substitutions to prevent substitution of the rest of the command substitution and the rest
of string respectively, giving script authors more options when processing text using subst. For example, the script
subst {abc,[break],def}
returns "abc,", not "abc,,def" and the script
subst {abc,[continue;expr {1+2}],def}
returns "abc,,def", not "abc,3,def".
Other exceptional return codes substitute the returned value
subst {abc,[return foo;expr {1+2}],def}
returns "abc,foo,def", not "abc,3,def" and
subst {abc,[return -code 10 foo;expr {1+2}],def}
also returns "abc,foo,def", not "abc,3,def".
SEE ALSO
Tcl(3tcl), eval(3tcl), break(3tcl), continue(3tcl)
KEYWORDS
backslash substitution, command substitution, variable substitution
Tcl 7.4 subst(3tcl)