Ok, I am thinking about developing a small little web app to help teach C to people. So you can type some C code into a text area, then a CGI Perl script or something similar would compile the code, then possibly execute it showing the results in another text area.
My concern of course is... (1 Reply)
if anyone knows how to do the loop and the function listed, please let me know it would be a great help. Thanks!
•Create an array NUM with the following ten values in it:
14, 25.6, 43, 22, 412.14, 819, 2, 721, 7.218, 11.9
•Print the array NUM
•Create an array COLOR with the following... (1 Reply)
I have 2 files , one is master file and another file i am genearting which contains Number of fails for all host & version.
The first file is master file which contains 2 column, Test Case name and Product Name:
daily/DB/attach/attach_redundancy.exp: YRS
daily/DB/help/help.exp: ... (0 Replies)
Is there a way to see or print a sub code?
Sometime a sub could be already defined, but in the debug mode (so, interactively) it could be already out of screen.
So, I would think about a way to check if the sub is defined (just 'defined' is not a problem) and how it is defined.
Also, if... (4 Replies)
Hi,
plz see the below code , i have catch the file "Orders.20110714.out "file
as a Orders*.out. but it giving me an error .it does not open the file.
if the same thing i have done by code
code-> ls Orders*.out then it gives me the output
Orders.20110714.out
i am trying apply the... (1 Reply)
What is the meaning of below code, which is capturing from one file .
$runDate = $1 if $str =~ m/,"TransactTime":"({10})/; # get transaction date as run date
Is it the date from the first line of file or last line of file??? (Note:Each line from the file contains date) (2 Replies)
Hi All,
I new to perl scripting, trying to write a program to get multiple inputs from the users and it should be stored in one variable. can some one help me with it .
here is the sample code i tried , but its not working.
# cat array.pl
#!/usr/bin/perl
print "enter the total no of... (4 Replies)
i'm using the below perl code to get a list of ips:
my @allipsfound ;
for my $elem (@gatches) {
my ($ip) = split ":",$elem;
print "$ip \n";
}
it spits out several lines of ips. most of those ips are the same. how do i do sort and uniq in the above code to make it so that it only... (3 Replies)
Discussion started by: SkySmart
3 Replies
LEARN ABOUT SUSE
catch
catch(n) Tcl Built-In Commands catch(n)
__________________________________________________________________________________________________________________________________________________NAME
catch - Evaluate script and trap exceptional returns
SYNOPSIS
catch script ?resultVarName? ?optionsVarName?
_________________________________________________________________DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. The catch command calls the Tcl interpreter recur-
sively to execute script, and always returns without raising an error, regardless of any errors that might occur while executing script.
If script raises an error, catch will return a non-zero integer value corresponding to the exceptional return code returned by evaluation
of script. Tcl defines the normal return code from script evaluation to be zero (0), or TCL_OK. Tcl also defines four exceptional return
codes: 1 (TCL_ERROR), 2 (TCL_RETURN), 3 (TCL_BREAK), and 4 (TCL_CONTINUE). Errors during evaluation of a script are indicated by a return
code of TCL_ERROR. The other exceptional return codes are returned by the return, break, and continue commands and in other special situa-
tions as documented. Tcl packages can define new commands that return other integer values as return codes as well, and scripts that make
use of the return -code command can also have return codes other than the five defined by Tcl.
If the resultVarName argument is given, then the variable it names is set to the result of the script evaluation. When the return code
from the script is 1 (TCL_ERROR), the value stored in resultVarName is an error message. When the return code from the script is 0
(TCL_OK), the value stored in resultVarName is the value returned from script.
If the optionsVarName argument is given, then the variable it names is set to a dictionary of return options returned by evaluation of |
script. Tcl specifies two entries that are always defined in the dictionary: -code and -level. When the return code from evaluation of |
script is not TCL_RETURN, the value of the -level entry will be 0, and the value of the -code entry will be the same as the return code. |
Only when the return code is TCL_RETURN will the values of the -level and -code entries be something else, as further described in the doc- |
umentation for the return command. |
When the return code from evaluation of script is TCL_ERROR, three additional entries are defined in the dictionary of return options |
stored in optionsVarName: -errorinfo, -errorcode, and -errorline. The value of the -errorinfo entry is a formatted stack trace containing |
more information about the context in which the error happened. The formatted stack trace is meant to be read by a person. The value of |
the -errorcode entry is additional information about the error stored as a list. The -errorcode value is meant to be further processed by |
programs, and may not be particularly readable by people. The value of the -errorline entry is an integer indicating which line of script |
was being evaluated when the error occurred. The values of the -errorinfo and -errorcode entries of the most recent error are also avail- |
able as values of the global variables ::errorInfo and ::errorCode respectively. |
Tcl packages may provide commands that set other entries in the dictionary of return options, and the return command may be used by scripts |
to set return options in addition to those defined above.
EXAMPLES
The catch command may be used in an if to branch based on the success of a script.
if { [catch {open $someFile w} fid] } {
puts stderr "Could not open $someFile for writing
$fid"
exit 1
}
There are more complex examples of catch usage in the documentation for the return command.
SEE ALSO
break(n), continue(n), dict(n), error(n), return(n), tclvars(n)
KEYWORDS
catch, error
Tcl 8.5 catch(n)