Hi All,
I need to pass a variable to perl script from bash script, where in perl i am using if condition. Here is the cmd what i am using in perl
FROM_DATE="06/05/2008"
TO_DATE="07/05/2008"
"perl -ne ' print if ( $_ >="$FROM_DATE" && $_ <= "$TO_DATE" ) ' filename"
filename has... (10 Replies)
Hi all,
I am running a Java program on a Linux server in which I read in a base directory path from the *.properties file. During processing, I build a unique file name and create a file to save data, concatenating the directory path and the file name. Works fine, except that I now need to... (2 Replies)
Hi All,
I am trying the following to set the environment variable in my scirpt.But it is not setting with the correct value.
Can you guys please help me out to get the correct value.
1. I have environment variable NLS_LANG=American_America.UTF8
2. In my script (ksh) i am trying the following... (1 Reply)
Hello!
For the moment some settings in my .bashrc contain the password of my company's firewall, which is not a good idea. I would like to use the string "PASSWORD" set in .bashrc and a script that changes all appearances of "PASSWORD" in the environment variables by the actual password (which... (4 Replies)
I have 3 programs, 1 in perl, 2 in csh: call them perl1, csh1 and run.ol
I need perl1 to set csh1 variable NOLOG_qsub = ""
I need perl1 to run, run.ol
run.ol takes the executable and input and outputs to output
run.ol#!/bin/csh -f
# run.ol executable input output
perl1 should... (1 Reply)
I want to set a enviroment variable
VDC_DIR to a particular directory.
I am doing it as
export VDC_DIR=/abc
it gets set but when i logout and do relogin than its not there.
one way could be setting it in .profile file.
but i have seen it on another box where it is not present in... (2 Replies)
Hello.
Normally when you double click on the file name, the shell script start in background.
If you want to see what is going on, you must open a terminal console and start the shell within the terminal.
Is it possible to start directly a shell script in a terminal console from the file... (0 Replies)
Hi all - just started using Linux Mint 17 and I need to change the Foreground & Background Colours for the Terminal, my eyesight is not what it used to be many years ago, so any help would be much appreciated.
Regards
Malcolm (6 Replies)
I know that I can do this in bash
ver=${VERSION:-$DEFVERSION}
so ver is $VERSION if it's set but $DEFVERSION if $VERSION isn't set
I want to do the same thing as a macro in a Makefile and can't get it to work - maybe something like...
VER=$(shell ${$(VERSION):-$(DEFVERSION)})
Any help... (1 Reply)
Hi All,
I need to pass a variable from bash script to perl script and in the perl script i am using those variables in the sql query but its giving
error :
Use of uninitialized value $ENV{"COUNTRYCD"} in concatenation (.) or string at /GIS_ROOT/custom/tables/DBread_vendor.pl line 50.
Can ... (6 Replies)
Discussion started by: NileshJ
6 Replies
LEARN ABOUT SUSE
system
SYSTEM(3) Linux Programmer's Manual SYSTEM(3)NAME
system - execute a shell command
SYNOPSIS
#include <stdlib.h>
int system(const char *command);
DESCRIPTION
system() executes a command specified in command by calling /bin/sh -c command, 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(2) 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 command 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
C89, C99, POSIX.1-2001.
NOTES
If the _XOPEN_SOURCE feature test macro is defined, then the macros described in wait(2) (WEXITSTATUS(), etc.) are made available when
including <stdlib.h>.
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptible, 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 set-user-ID or set-group-ID 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 set-user-ID or set-group-ID 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.)
In versions of glibc before 2.1.3, the check for the availability of /bin/sh was not actually performed if command was NULL; instead it was
always assumed to be available, and system() always returned 1 in this case. Since glibc 2.1.3, this check is performed because, even
though POSIX.1-2001 requires a conforming implementation to provide a shell, that shell may not be available or executable if the calling
program has previously called chroot(2) (which is not specified by POSIX.1-2001).
It is possible for the shell command to return 127, so that code is not a sure indication that the execve(2) call failed.
SEE ALSO sh(1), signal(2), wait(2), exec(3)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2004-12-20 SYSTEM(3)