hi all,
i wrote a script to mail myself using pine (modified) to keep remind of b'days.
#!/bin/bash
grep "`date +%D |awk -F/ '{print $2+1, $1+0}'`" dataFile >/home/username/mailme
if test -s /home/username/mailme
then
pine -I '^X,y' -subject "Birthday Remainder" username... (4 Replies)
hi!
i m tryin to write a program that will perform a specific tasks after fixed interval of time.say every 1 min.
i jus donno how to go abt it.. which functions to use and so on...
i wud like to add that i am dont want to use crontab over here.
ny lead is appreciated.
thanx. (2 Replies)
Good day
I am fairly new to Shell Scripting.
I want a script to check if a process is up by checking the process's PID and then return a value for when it's running which would be 0. If it isn't running it should give any other value that 0.
Any Help is appreciated
Regards (9 Replies)
Hi we have weblogic deployed under Linux Enterprise 5 .
Now i want to write a script that checks if weblogic is running or not
I have found that weblogic uses Java as process .
Can i do this way :
my Script File :
Echo Checking Status
if
then
echo Server Running
else
echo... (2 Replies)
Hi,
I have a cron job which runs every ten minutes, now i hav to check the process whether it is running or not only once and then this should be sent to a log file..
crontab :
00,10,20,30,40,50 * * * * a
process check
ps = 'ps -ef |grep a '
if
then
echo " Success" >... (3 Replies)
Hello all,
I have a text files that consists of blocks of text. Each block of text represents a set of Cartesian coordinates for a molecule. Each block of text starts with a line that has a only a number, which is equal to the total number of atoms in the molecule. After this number is a line... (15 Replies)
Hi,
I need your expertise in selecting files from a folder.
I have files named with convention: filename.i.j
where j is an interger from 1 to 16, for each i which is an integer from 1 to 2000.
I would like to select the files with i in regular interval of 50 like
filename.1.j,... (2 Replies)
I need to write a script which can send files via sftp communication continously for half an hour or any given duration of time. I have already written a batch file to send multiple file via SFTP.
but I need to know how can we set a duration of half an hour through shell script. Can we use sleep... (2 Replies)
Hi Team,
I am using redhat 6.4 version server.We have a script which is used to check the process and sends email if the process is not running.If it is running it will continue and do some other operation.
I didnot understand below option -z in the if condition.I have tried to... (5 Replies)
Hi All,
Have a query
How to check for a process and if down start it , try if for 2 times and its not starting don't do it
My code is working to some extent but while starting try starting both times.
Please advise , whats wrong here ?
if you have any other approach please do share.
My... (1 Reply)
Discussion started by: abhaydas
1 Replies
LEARN ABOUT REDHAT
system
SYSTEM(3) Linux Programmer's Manual SYSTEM(3)NAME
system - execute a shell command
SYNOPSIS
#include <stdlib.h>
int system(const char *string);
DESCRIPTION
system() executes a command specified in string by calling /bin/sh -c string, and returns after the command has been completed. During
execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored.
RETURN VALUE
The value returned is -1 on error (e.g. fork failed), and the return status of the command otherwise. This latter return status is in the
format specified in wait(2). Thus, the exit code of the command will be WEXITSTATUS(status). In case /bin/sh could not be executed, the
exit status will be that of a command that does exit(127).
If the value of string is NULL, system() returns nonzero if the shell is available, and zero if not.
system() does not affect the wait status of any other children.
CONFORMING TO
ANSI C, POSIX.2, BSD 4.3
NOTES
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptable, unless they take care
themselves to check the exit status of the child. E.g.
while(something) {
int ret = system("foo");
if (WIFSIGNALED(ret) &&
(WTERMSIG(ret) == SIGINT || WTERMSIG(ret) == SIGQUIT))
break;
}
Do not use system() from a program with suid or sgid privileges, because strange values for some environment variables might be used to
subvert system integrity. Use the exec(3) family of functions instead, but not execlp(3) or execvp(3). system() will not, in fact, work
properly from programs with suid or sgid privileges on systems on which /bin/sh is bash version 2, since bash 2 drops privileges on
startup. (Debian uses a modified bash which does not do this when invoked as sh.)
The check for the availability of /bin/sh is not actually performed; it is always assumed to be available. ISO C specifies the check, but
POSIX.2 specifies that the return shall always be non-zero, since a system without the shell is not conforming, and it is this that is
implemented.
It is possible for the shell command to return 127, so that code is not a sure indication that the execve() call failed.
SEE ALSO sh(1), signal(2), wait(2), exec(3)
2001-09-23 SYSTEM(3)