This question has been covered before in these fora; try searching for proposed solutions. This is one of the possible search results.
You could work with - let's call it - "status files". When a function has finished satisfactorily, touch a result file, and skip execution of the function if it exists, like
This will execute your functions in the desired order if the result file does not exist. For fs_ck it will fail, won't create the result file, and start over with fs_ck skipping the logging function. Give it a try and report back.
I am working on an unix server which has a mount point of windows server in it. I just need to check about the connectivity of this mount point with the windows server. Please let me know what should be done for that. (1 Reply)
Hiii
I actually intent to check the integer or floating point number input by user i.e. 23, 100, 55.25, 12.50 ..etc. However, when someone input strings or alpha character, my program has to show invalid input.!! Is there any Unix shell script syntax can help me to check ?
Thanking you (2 Replies)
Hi Friends,
I need expert help:),
I have bellow script that function for searching string in multiple file,
the script is working well.
but I thing it still can be optimize since so many repetition in bellow command, where string that I marked BOLD italic is clue for what I am looking for... (2 Replies)
I have the below shell script which is checking /archlog mount point space on cappire(solaris 10) server. When the space usage is above 80% it should e-mail. When i tested this script it is working as expected.
-------------------------------------------------------------------------... (0 Replies)
Hi - little introductory post for this thread:
The discussion started in the "What's your most useful shell?" poll thread and I think the discussion's gone on long enough that I don't want new posts related to that discussion to go there any more. It's a big discussion and it only gets bigger. ... (26 Replies)
how to create local mount point at startup
Filesystem GB blocks Free %Used Iused %Iused Mounted on
xxxxxxxx 370.00 180.08 51% 24500 1% /test (5 Replies)
I have test.dat file with values given below:
20150202,abc,,,,3625.300000,,,,,-5,,,,,,,,,,,,,,,,,,,,,,
20150202,def,,,,32.585,,,,,0,,,,,,,,,,,,,,,,,,,,,,
20150202,xyz,,,,12,,,,,0.004167,,,,,,,,,,,,,,,,,,,,,,
My expected output is shown below:
... (1 Reply)
How to create a new mount point with 600GB and add 350 GBexisting mount point
Best if there step that i can follow or execute before i mount or add diskspace IN AIX
Thanks (2 Replies)
Discussion started by: Thilagarajan
2 Replies
LEARN ABOUT LINUX
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 (before including any header files), then the macros described in wait(2) (WEXITSTA-
TUS(), 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 3.27 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/.
2010-09-10 SYSTEM(3)