12-07-2005
The "exec" builtin in bash (sh on Linux seems to be too) will run the perl process without creating a new process by replacing the original shell process, just like the C exec* family of functions.
So you ought to be able to run a script by "./script.sh" to create a new process and then "exec perl script.pl" to continue execution without introducing a new process, but the original shell script will terminate (control will not return to the shell script).
Last edited by cbkihong; 12-07-2005 at 08:52 PM..
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi all
Recently i had finished a perl script. When i run manually, the script work fine.
But when i wanted to put the script in cron, it didn't get the same output as it run manually. I felt that it only execute the script until certain line then it stop as i see most of the related files didn't... (6 Replies)
Discussion started by: AirWalker83
6 Replies
2. Shell Programming and Scripting
Hi,
I have more than 1 files in the directory. In bash, I can use
cd /work
for x in `ls`
do
:
:
done
to run for each file in the directory.
How about in perl script?
filepath="ABC1"
open(FILE, $filepath) or die "$filepath cannot be opened.";
while(<FILE>) {
: (1 Reply)
Discussion started by: natalie23
1 Replies
3. UNIX for Dummies Questions & Answers
Hi Experts,
I have written simple perl script, which assign the value to variable and print it. Following is the script:
$ cat 3.pl
#!/usr/bin/env ksh
#!/usr/bin/perl
print "Hello World";
$iputlne = 34;
print $iputlne;
The error output is:
$ /usr/bin/env perl 3.pl
Hello World... (9 Replies)
Discussion started by: Amey Joshi
9 Replies
4. Shell Programming and Scripting
Hi,
I have a query about processing and running Perl program at the background.
I have HTML file called Userform.html which accepts input from the user. As soon as input is given the contol goes to get.cgi (get.cgi does some processing and computing tasks).
Actually get .cgi takes more... (0 Replies)
Discussion started by: vanitham
0 Replies
5. Shell Programming and Scripting
Hello,
If I run this command on the server it works.
# dbc "update config set radio_enabled = 0;"
how can I execute the same command in perl. I have defined the dbc path. Can any one please correct the last line.
#!/usr/bin/perl
#database path
$dbc='/opt/bin/psql -Userver... (0 Replies)
Discussion started by: sureshcisco
0 Replies
6. Shell Programming and Scripting
Hello
i want create perl script to connect remotely to another machine and run perl script
please note that the remote script check for different variables remotely and not located on local machine
also i want to know how to send interactive variables
i am trying to make script to... (2 Replies)
Discussion started by: mogabr
2 Replies
7. Shell Programming and Scripting
I have a requirement as follows.
when i pass a date to the perl script, it has to calculate the current date - 8 months and output the date back to the shell script in date format (YYYY-MM-DD).
Current date - 8 months is not constant.. because leap year, and the months jan, mar, may,.... has... (4 Replies)
Discussion started by: kmanivan82
4 Replies
8. Shell Programming and Scripting
Hello,
I'm trying to run "csso" (minify css) in a CGI script from the web panel.
That is not working: Returns error 0;
my $cmd = qq`csso stylesheet.css > stylesheet.min.css`;
system($cmd);
But that is working:
my $cmd = qq`echo 'blabla' > stylesheet.min.css`;
system($cmd);
I'm... (12 Replies)
Discussion started by: madispuk
12 Replies
9. Programming
I have reviewed many examples on-line about running another process (either PERL or shell command or a program), but do not find any usefull for my needs way. (Reviewed and not useful the system(), 'back ticks', exec() and open())
I would like to run another PERL-script from first one, not... (1 Reply)
Discussion started by: alex_5161
1 Replies
10. Shell Programming and Scripting
Linux System having all Perl, Python, PHP (and Ruby) installed
From a Shell script, can call a Perl, Python, PHP (or Ruby ?) file
eg
eg
a Shell script run in a case statement call to run a php file, also Perl or/and Python file???
Like
#!/usr/bin/bash
....
....
case $INPUT_STRING... (1 Reply)
Discussion started by: hoyanet
1 Replies
exec(1) User Commands exec(1)
NAME
exec, eval, source - shell built-in functions to execute other commands
SYNOPSIS
sh
exec [argument...]
eval [argument...]
csh
exec command
eval argument...
source [-h] name
ksh
*exec [arg...]
*eval [arg...]
DESCRIPTION
sh
The exec command specified by the arguments is executed in place of this shell without creating a new process. Input/output arguments may
appear and, if no other arguments are given, cause the shell input/output to be modified.
The arguments to the eval built-in are read as input to the shell and the resulting command(s) executed.
csh
exec executes command in place of the current shell, which terminates.
eval reads its arguments as input to the shell and executes the resulting command(s). This is usually used to execute commands generated as
the result of command or variable substitution.
source reads commands from name. source commands may be nested, but if they are nested too deeply the shell may run out of file descrip-
tors. An error in a sourced file at any level terminates all nested source commands.
-h Place commands from the file name on the history list without executing them.
ksh
With the exec built-in, if arg is given, the command specified by the arguments is executed in place of this shell without creating a new
process. Input/output arguments may appear and affect the current process. If no arguments are given the effect of this command is to mod-
ify file descriptors as prescribed by the input/output redirection list. In this case, any file descriptor numbers greater than 2 that are
opened with this mechanism are closed when invoking another program.
The arguments to eval are read as input to the shell and the resulting command(s) executed.
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.
EXIT STATUS
For ksh:
If command is not found, the exit status is 127. If command is found, but is not an executable utility, the exit status is 126. If a redi-
rection error occurs, the shell exits with a value in the range 1-125. Otherwise, exec returns a zero exit status.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 17 Jul 2002 exec(1)