yea i know what you mean about perl and it not complaining but i guess that's the reason for the rant. perl doesn't care about my 'critical' step in the code. but i'm not lazy, i'll figure it out some way.
I tried to simplify the output as you suggested in both examples but for some reason my browser just spins when I try to load the page even with the system call commented out. I had to kill this on my box.
Looking at the man, i tried to follow but got lost at `$?`
Quote:
You can check all the failure possibilities by inspecting $?
like this:
if ($? == -1) {
print "failed to execute: $!\n";
}
elsif ($? & 127) {
printf "child died with signal %d, %s coredump\n",
($? & 127), ($? & 128) ? 'with' : 'without';
}
else {
printf "child exited with value %d\n", $? >> 8;
}
So my next task is to learn how to take this tidbit to test this and any other future shell scripts against perl. My command 'hellow' still works fine when typed directly into the cl. I forgot to mention that the hellow.sh was copied, moved, and exported into my shell env ~/home/root/bin.. that's why i'm somewhat dumbfounded... pwd works but hellow doesn't still and i'm clueless. I'm hoping that testing it in perl with the code above might give me some more info. Need some input on what to put where. Should i just replace all `?` to `hellow`??
Hello,
I have a problem with trying to run a shell script that reads in user input, validates, and sets to a 'default' value if the input is not valid. I cannot get the portion of resetting to a default value to work. These lines are skipped, and the
value of x is still whatever the user... (1 Reply)
Hi
I am trying to write a login script for network based clients (OSX) that looks up local accounts eg admin, root, etc and exits the script so that it doesn't apply to them. Then for everyone else I make folders eg movies, music, etc that are placed in local harddrive rather than the default... (11 Replies)
Hi guys,
I need to run and test some shell script. At work, i work on ksh. I don't have any such software/client installed at home and i cannot always connect to work from home. At home i have Windows Vista.
Is there a free and reliable software where i can run my ksh script?
Please let me... (4 Replies)
Hi Experts!!
I have written a very simple script in perl.The script is :
$ cat 1.pl
#!/usr/bin/perl
print "Hi there!\n";
When i ran the above perl script it is showing the following error:
$ perl 1.pl
-ksh: cd: bad substitution
Can anybody,help on this ....as why this script is... (1 Reply)
Hi Folks,
I have 2 perl scripts and I need to execute 2nd perl script from the 1st perl script in WINDOWS.
In the 1st perl script that I had, I am calling the 2nd script
main.pl
===========
print "This is my main script\n";
`perl C:\\Users\\sripathg\\Desktop\\scripts\\hi.pl`;
... (3 Replies)
Shell Scipt: temp.sh
su - <$username>
expect pass.exp
Expect script: pass.exp
#!/usr/bin/expect -f
# Login
#######################
expect "Password: " send "<$password>\r"
it comes up with Password: but doesnt take password passed throguh file. (2 Replies)
Hi friends,
i need to prepare a script ( in perl)
i have a file called "demo.exe" in my local unix host.
i have a list of remote hosts in a file "hosts.txt"
now i need to push "demo.exe" file to all the hosts in "hosts.txt" file.
for this i need to prepare a script(in perl, but shell... (5 Replies)
I need to run a local shell script on a remote machine. I am able to achieve that by executing the command
> ssh -qtt user@host < test.sh
However, when I try to pass arguments to test.sh it fails.
Any pointers would be appreciated. (7 Replies)
Hello All,
I need immediate help in creating shell script to call archivebkup.ksh script when archive file system capacity reaches threshold value or 60%
Need to identify the unique file system that reaches threshold value.
ex:
capacity
... (4 Replies)
local script:
cat > first.sh
cd /tmp
echo $PWD
echo `whoami`
cd /tmp/123
tar -cvf 789.tar 456
sleep 10
except script:
cat > first
#!/usr/bin/expect
set ip 10.5.15.20
set user "xyz123"
set password "123456"
set script first.sh
spawn sh -c "ssh $user@$ip bash < $script" (1 Reply)
Discussion started by: Aditya Avanth
1 Replies
LEARN ABOUT DEBIAN
proc::syncexec
SyncExec(3pm) User Contributed Perl Documentation SyncExec(3pm)NAME
Proc::SyncExec - Spawn processes but report exec() errors
SYNOPSIS
# Normal-looking piped opens which properly report exec() errors in $!:
sync_open WRITER_FH, "|command -with args" or die $!;
sync_open READER_FH, "command -with args|" or die $!;
# Synchronized fork/exec which reports exec errors in $!:
$pid = sync_exec $command, @arg;
$pid = sync_exec $code_ref, $cmd, @arg; # run code after fork in kid
# fork() which retries if it fails, then croaks() if it still fails.
$pid = fork_retry;
$pid = fork_retry 100; # retry 100 times rather than 5
$pid = fork_retry 100, 2; # sleep 2 rather than 5 seconds between
# A couple of interfaces similar to sync_open() but which let you
# avoid the shell:
$pid = sync_fhpopen_noshell READERFH, 'r', @command;
$pid = sync_fhpopen_noshell WRITERFH, 'w', @command;
$fh = sync_popen_noshell 'r', @command_which_outputs;
$fh = sync_popen_noshell 'w', @command_which_inputs;
($fh, $pid) = sync_popen_noshell 'r', @command_which_outputs;
($fh, $pid)= sync_popen_noshell 'w', @command_which_inputs;
DESCRIPTION
This module contains functions for synchronized process spawning with full error return. If the child's exec() call fails the reason for
the failure is reported back to the parent.
These functions will croak() if they encounter an unexpected system error, such as a pipe() failure or a repeated fork() failure.
Nothing is exported by default.
fork_retry [max-retries [sleep-between]]
This function runs fork() until it succeeds or until max-retries (default 5) attempts have been made, sleeping sleep-between seconds
(default 5) between attempts. If the last fork() fails fork_retry croak()s.
sync_exec [code] command...
This function is similar to a fork()/exec() sequence but with a few twists.
sync_exec does not return until after the fork()ed child has already performed its exec(). The synchronization this provides is useful
in some unusual circumstances.
Normally the pid of the child process is returned. However, if the child fails its exec() sync_exec returns undef and sets $! to the
reason for the child's exec() failure.
Since the @cmd array is passed directly to Perl's exec() Perl might choose to invoke the command via the shell if @cmd contains only
one element and it looks like it needs a shell to interpret it. If this happens the return value of sync_exec only indicates whether
the exec() of the shell worked.
The optional initial code argument must be a code reference. If it is present it is run in the child just before exec() is called.
You can use this to set up redirections or whatever. If code returns false no exec is performed, instead a failure is returned using
the current $! value (or EINTR if $! is 0).
If the fork() fails or if there is some other unexpected system error sync_exec croak()s rather than returning.
sync_fhpopen_noshell fh type cmd [arg]...
This is a popen() but it never invokes the shell and it uses sync_exec() under the covers. See "sync_exec".
The type is either 'r' to read from the process or 'w' to write to it.
The return value is the pid of the forked process.
sync_popen_noshell type cmd arg...
This is like sync_fhpopen_noshell, but you don't have to supply the filehandle.
If called in an array context the return value is a list consisting of the filehandle and the PID of the child. In a scalar context
only the filehandle is returned.
sync_open fh [open-spec]
This is like a Perl open() except that if a pipe is involved and the implied exec() fails sync_open() fails with $! set appropriately.
See "sync_exec".
Like sync_exec, sync_open croak()s if there is an unexpected system error (such as a failed pipe()).
Also like sync_exec, if you use a command which Perl needs to use the shell to interpret you'll only know if the exec of the shell
worked. Use sync_fhpopen_noshell or sync_exec to be sure that this doesn't happen.
AUTHOR
Roderick Schertler <roderick@argon.org>
SEE ALSO perl(1).
perl v5.8.8 2005-02-04 SyncExec(3pm)