I still don't catch your logic. Do you want to check if all 3 get() calls returned a value? If so, rewrite it to
Otherwise, please describe the logic you're thinking of in these 3 specific lines.
Hi,
I am opening a file......then i am wrting some data into it......and i am reopening the file again but ......i get a error cannot open file.......
$::file= "\adder\testfile.txt"
open(TEST1,$::file);
some write operation
close(TEST1)
open(TEST1,$::file) 'I GET A ERROR CAN OPEN... (2 Replies)
Guys,
I'm doing signal handling in Perl. I'm trying to catch ^C signal inside the script.
There two scripts : one shell script and one perl script.
The shell script calls the perl script.
For e.g. shell script a.sh and perl scipt sig.pl.
Shell script a.sh looks something like this :... (6 Replies)
Hi there,
I'm newby in perl and XML. I can read and parse Xml with XML-Node upper XML::Parser, but how can I create XML tags and pack my individual data in it then send through socket. PLZ lead me :)
Thanks in Advance. (1 Reply)
Hi,
Here is my piece of code--
sub per_user_qna_detail
{
for($index=0;$index<@records;$index++)
{
if($records =~ m/^(.*)\s*Morocco.*Entering\s*Module::authenticate/)
{
printf "INSIDE per_user_qna_detail on LINE NO $index\n";
$Time_Stamp = $1;... (0 Replies)
Hello all,
I have created a Perl script that tries to open connections to various systems on different ports in order to see if the machines are reachable, the ports are open, etc.
There appears to be a difference between Solaris (10) and Linux (RH/Oracle and Ubuntu) in the status or error it... (4 Replies)
Hi All,
I'm pretty new to the forum and also to UNIX. I have a requirement for which I need some help. I have a script (example.script) where I get user inputs using the read command. I would need to pass the read-fetched input to a perl command (explained below) in my script. The part which... (3 Replies)
$# some text
$$ some text
$@ some text
$$. some text
Mg1 some text
Mg2 some text
.
.
.
Mg10 some text
The above 10 lines are to be extracted except the lines starting from $#,$$.,... (4 Replies)
I have a PERL command line embedded in a UNIX script. The script doesn't handle errors coming out of this command. I'm processing large files and occassionally I run out of disk space and end up with half a file.
perl -p -e 's/\n/\r\n/g' < TR_TMP_$4 > $4
How do I handle errors coming out... (1 Reply)
Hi
Am making connection to oracle using ISQL as shown in the code.
This code is just a minor part of a big code.
I want to capture the error if the password/login is wrong or if connection is not made.
I need to capture the error code also.
Also, If such an error occurs, i need to exit out... (4 Replies)
Hi,
I am reading and file and writting each word to other file.
where I have used array to store the data.
I am getting below error as
"Use of uninitialized value in concatenation (.) or string at customize_split_raw.pl line 51, <IN_FILE> "
Where my line 51 code is
50 foreach... (8 Replies)
Discussion started by: Beginer123
8 Replies
LEARN ABOUT OSX
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)