By using backticks you are capturing the output of the shell command. This is not the same as its exit status.
For the exit status you need $? following your `STRING` (see perlop) or a system call (see perlfunc). Then the exit status is $?>>8 (read about $? in perlvar).
e.g.
I am using perl 5.8.0.
I need to check some values to see it they are floats. Our system does not have Data::Types so I can't use is_float. Is there something else that I can use? The only thing in Data is Dump.pm. I am not allowed to download anything to our system so I have to use what I have.... (3 Replies)
Hi All,
I need some expert help in performing the following in Perl.
I have a code below but it doesn;t seem to work. Can any expert give me some advice?
Below are the requirements
1) Open numerous files assigned to an array @FILES. Note that the files are always named with the term... (7 Replies)
Hi All,
I am new to perl and have been trying to write a short script to check a process.Though i havent reached to the stage where i can match the output.
I am trying to pass a variable x with value /opt/RGw/csbp-base/CSBP_BAT.01.00.05/csbp_BAT.01.00.05.jar
and then pass another variable... (2 Replies)
hi everybody .
i'm trying to extract a bunch of urls from an http request but when i do that i get nothing .
here it's my code
use LWP::UserAgent;
$url = "$ARGV"; $ua = LWP::UserAgent->new;
$req = HTTP::Request->new(GET=>$url);
$res = $ua->request($req);
if... (0 Replies)
Hey guys i am facing a problem in my sql statement. I am trying to check if there is such a value in the database.
Code:
string NewMovie = "ww";
string queryText ;
queryText = "Select * from movie_info WHERE movie_title = '"+ NewTitle +"'";
... (1 Reply)
Hi All,
I would like to ask what is the command line on OpenBSD which able to be used to check the list of library which used by specific daemon?
For example, I would like to check what are the libraries which are used by ftpd.
Thank you in advance.
Regards,
Stefan (2 Replies)
Hi all,
I've written a Perl script below that check and report for malformed braces. I have a UNIX ksh version and it took a couple of minutes to run on a 10000+ lines. With the Perl version it only took about 20 seconds so that is enough incentive for me to go Perl not to mention that I need... (1 Reply)
Hey fellas,
I've posted this problem a few days back and I received just one post which was in PHP that I have no idea about! (Thanks to DGPickett) It would be so nice if you can help me with this in Shell or Perl. Here is the story:
I have a big table with variables and observations. I... (9 Replies)
Hi Linux Community
I would like to ask about how to compare files in deferent server with date.
Those A and B servers has the same folder, I have write a sample script to "ls" both folders and "diff" them, and then "rsync" the missing files.
It was running well, both A and B are sync, until... (2 Replies)
My question is basically as the title says. How can I check a user inputted string is only certain characters long (for example, 3 characters long) and how do I check a user inputted string only contains certain characters (for example, it should only contain the characters 'u', 'a', 'g', and 'c')... (4 Replies)
Discussion started by: Eric1
4 Replies
LEARN ABOUT PLAN9
return
exit(1) User Commands exit(1)NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps
SYNOPSIS
sh
exit [n]
return [n]
csh
exit [ ( expr )]
goto label
ksh
*exit [n]
*return [n]
DESCRIPTION
sh
exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of
the last command executed (an EOF will also cause the shell to exit.)
return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe-
cuted.
csh
exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the
expression expr.
The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches
for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to
jump to a label that occurs between a while or for built-in command and its corresponding end.
ksh
exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8
bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing
a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit
except for a shell which has the ignoreeof option (See set below) turned on.
return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the
least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return
is invoked while not in a function or a '.' script, then it is the same as an exit.
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 break(1), csh(1), ksh(1), sh(1), attributes(5)SunOS 5.10 15 Apr 1994 exit(1)