Can you use ksh instead of sh? If so, you can easily test the answers with something like:
If you want to display results and quit when the user hits Ctrl-C, you'll need to trap that signal. The syntax is
In your case, the signal would be INT.
hey i have been facing a problem,can you tell me if we can catch ctrl d in unix i have tried and sucessfully catched and disabled ctrl-c and ctrl -z but am not sure if we can do the same for CTRL-D, so got any clue mail on he forum or ...i mean c programming in Unix thats what i am working on (1 Reply)
Hi,
Recently I was reading some c coding by some colleagues and I noticed that the above trend. They will create a pipe for the process then they will use the standard signal handler to capture a particular signal and write that signal to the pipe. On the other end, the process will read the... (7 Replies)
Can anyone explain to me how to get the last two chars' from each row of Column (each row being variable in length) using awk, some of the lines will be blank, I'll be running a paste after awking. So I need to keep the blanks where they are..so I can paste back all columns in the correct order
... (9 Replies)
I have a Unix Script that has several exit in the middle. each returning seperate
exit codes.
I have to catch all the exit's and perform an operation say "Mail the status code" before the actual code completes.
How can i do this in KSH ? (3 Replies)
Hi!
I want to catch all signals that my program receives print their name and then execute the default handler.
Can you help me on that?
I've tried the following code:
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
void (*hnd)(int i);
char signals =
{
"SIGHUP",... (7 Replies)
I have code which at the moment only catches the command/program output if the program runs correctly, which is a small problem as I would like to capture everything from stdout inclusive of errors
FILE *fp;
fp = popen(command.c_str(), "r");
while(fgets(cbuf, 1024, fp) != NULL){
.....do stuff... (1 Reply)
Hi,
I'm writing a scheduling script which will co-ordinate the launching of scripts.
This script is scheduling based on an input file, and launches the appropriate scripts at the right times.
The only issue I'm having is:
- if a script dies, or even has a syntax error, I want to catch... (1 Reply)
Hi All Experts,
I have a script which logs to the server via sftp connection with below code :-
user_name@sftp_server.com
and the connection is going smooth.
My requirement is to place file in sftp_server in some path.
and if path doesn't exist or the file is not put successfully I... (3 Replies)
Solaris 9 system:
I'm trying to get BSM to record to the point where additional files being put into /etc/opt/csw/sudoers.d will be recorded but thus far all I'm able to get are when files are deleted (via unlink). I've even tried auditing based on the "all" audit flag temporarily (thinking I... (2 Replies)
Discussion started by: thmnetwork
2 Replies
LEARN ABOUT ULTRIX
trap
trap(1) User Commands trap(1)NAME
trap, onintr - shell built-in functions to respond to (hardware) signals
SYNOPSIS
sh
trap [ argument n [n2...]]
csh
onintr [-| label]
ksh
*trap [ arg sig [ sig2...]]
DESCRIPTION
sh
The trap command argument is to be read and executed when the shell receives numeric or symbolic signal(s) (n). (Note: argument is scanned
once when the trap is set and once when the trap is taken.) Trap commands are executed in order of signal number or corresponding symbolic
names. Any attempt to set a trap on a signal that was ignored on entry to the current shell is ineffective. An attempt to trap on signal 11
(memory fault) produces an error. If argument is absent all trap(s) n are reset to their original values. If argument is the null string
this signal is ignored by the shell and by the commands it invokes. If n is 0 the command argument is executed on exit from the shell. The
trap command with no arguments prints a list of commands associated with each signal number.
csh
onintr controls the action of the shell on interrupts. With no arguments, onintr restores the default action of the shell on interrupts.
(The shell terminates shell scripts and returns to the terminal command input level). With the - argument, the shell ignores all inter-
rupts. With a label argument, the shell executes a goto label when an interrupt is received or a child process terminates because it was
interrupted.
ksh
trap uses arg as a command to be read and executed when the shell receives signal(s) sig. (Note that arg is scanned once when the trap is
set and once when the trap is taken.) Each sig can be given as a number or as the name of the signal. trap commands are executed in order
of signal number. Any attempt to set a trap on a signal that was ignored on entry to the current shell is ineffective. If arg is omitted
or is -, then the trap(s) for each sig are reset to their original values. If arg is the null (the empty string, e.g., "" ) string then
this signal is ignored by the shell and by the commands it invokes. If sig is ERR then arg will be executed whenever a command has a non-
zero exit status. If sig is DEBUG then arg will be executed after each command. If sig is 0 or EXIT for a trap set outside any function
then the command arg is executed on exit from the shell. The trap command with no arguments prints a list of commands associated with each
signal number.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO csh(1), exit(1), ksh(1), sh(1), attributes(5)SunOS 5.10 23 Oct 1994 trap(1)