hey , everyone. I have a few questions about pieces of code and was wondering if someone could tell me what exactly they did or if they are even valid.
bool1 && bool2 || bool3 <---in what order do these get processed?
if (! isdigit(c)) <---What does this do?
i = j % 3; <---what does this do?... (4 Replies)
Hi Folks,
I'm using bash script. I would like to check whether input is a number or not.(Only positive numbers).. if space or non numeric is entered, it should say "invalid input". pls help..
thanks in adv.
Br///
Vijay. (1 Reply)
Hello,
I am trying to write an expect script that will ssh into a large number of Cisco routers and add some commands via the cli. The script I wrote works great for one host however I have over 350 routers that this needs to be added to. The problem is I cannot get the script to read the file of... (1 Reply)
#include <iostream>
#include<stdio.h>
using namespace std;
class a
{
public:
int xx;
a()
{
cout << "in CONS a \n";
}
~a()
{
cout << "in DES a \n";
}
}; (1 Reply)
Experts,
In a script i get the following error:
The specified substitution is not valid for this command
Do you have any idea what is wrong with it?
TITLE="Code Checker" # Script Titel #
EXT="_UA99" # Eind van dirnaam #
FILE="job.dat" # Zoekbestandsnaam #
SEARCH="returncode 0" #... (1 Reply)
Could someone help me by midnight tonight!!!
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Insert a reference to the Bourne shell as the command... (0 Replies)
Ok so this is sort of a unix question. I am frequently logging into customers boxes and our product integrates with Active directory.
I deal with a great deal of people who have no business being admins but are and they don't know squat about their network or their DC's. So a recurring problem... (4 Replies)
Hi everyone,
I cant seem to figure this out for the life of me. Basically, I have two arrays..
sub init {
use Getopt::Long;
use Data::Dumper;
my @selections = ();
my @valid_options = ( "vaild1", "valid2" );
GetOptions( "input=s" =>... (2 Replies)
Hi,
echo "Enter file name of input file list along with absolute path : "
read inputFileList
if
then
for string in `cat inputFileList`
do
echo $string
done
else
echo " file does not exist"
fi
From the above code, if the user enters a invalid file... (1 Reply)
How to check the user input to be valid using shell script?
The valid input is in the format like as follows.
1. It can only have r,w,x or a hyphen and nothing else.
2. ensure the r, w, x are in the correct order.
for example: rwxr-xr-x is a valid format.
Thanks (5 Replies)
Discussion started by: hyeewang
5 Replies
LEARN ABOUT REDHAT
catch
catch(n) Tcl Built-In Commands catch(n)
__________________________________________________________________________________________________________________________________________________NAME
catch - Evaluate script and trap exceptional returns
SYNOPSIS
catch script ?varName?
_________________________________________________________________DESCRIPTION
The catch command may be used to prevent errors from aborting command interpretation. Catch calls the Tcl interpreter recursively to exe-
cute 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 one of the exceptional return codes (see tcl.h for
the definitions of code values). If the varName argument is given, then the variable it names is set to the error message from interpret-
ing script.
If script does not raise an error, catch will return 0 (TCL_OK) and set the variable to the value returned from script.
Note that catch catches all exceptions, including those generated by break and continue as well as errors. The only errors that are not
caught are syntax errors found when the script is compiled. This is because the catch command only catches errors during runtime. When
the catch statement is compiled, the script is compiled as well and any syntax errors will generate a Tcl error.
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
}
The catch command will not catch compiled syntax errors. The first time proc foo is called, the body will be compiled and a Tcl error will
be generated.
proc foo {} {
catch {expr {1 +- }}
}
KEYWORDS
catch, error
Tcl 8.0 catch(n)