I am having trouble running a .sh file. The code 'x=${file_name:0:$z-11}' is giving me a bad substitution error. However when I run in BASH it works. Thing is when this goes to production the .sh will not be running in BASH. Is there a way to substring a string not in BASH or a way to invoke... (2 Replies)
I'm trying to use unison from bash on windows with cygwin. I don't know if this is a cygwin question, bash question or unison question. Since I always get reprimanded by the cygwin mailing list for assuming it is a cygwin problem, I'll assume it is a bash question.
The following commands work... (7 Replies)
Hello,
So my knowledge of bash scripting is not that great and I have been trying to solve this problem on my own for awhile to no avail.
Here's the error I get when running it with an OS that uses bash 3.2.x:
testagain.sh: line 10: *-1: syntax error: operand expected (error token is... (2 Replies)
I am working with a sh script on a solaris 9 zone (sol 10 host) that grabs information to build the configuration command line. the variables Build64, SSLopt, CONFIGopt, and CC are populated in the script. the script includes
CC=`which gcc`
CONFIGopt=' --prefix=/ --exec-prefix=/usr... (8 Replies)
Greetings, I have a C-program that is made to implement a hidden Markov model on an input file. The program is very memory intensive.
I've installed it on my local server where I have an account and it compiles fine. The way they have the server set up is that you can either work... (1 Reply)
Hello,
i have cronjob:
crontab -l
* * * * * pkill -f domexpcheck;sh /root/dom/domexpcheck.sh
it runs:
/var/log/cron
Mar 25 12:11:01 vps crond: (root) CMD (pkill -f domexpcheck;sh /root/dom/domexpcheck.sh)
but somehow script dont run properly via cronjob. But when i execute cronjob... (7 Replies)
Hi, I've got a Bash backup script I'm trying to run on a directory via a cron job nightly. If I ssh in and run the script manually it works flawlessly. If I set up the cron to run evertything is totally messed up I don't even know where to begin.
Basically the path structure is
... (6 Replies)
I ran this script yesterday (in the background)
/usr/bin/nohup myfilelocation/myscriptname.sh &
the script worked perfectly.
i ran it today (also in the background) and just sat there. So i killed it and ran it normally and it worked perfectly.
Anyone suggest why it just sat there and... (8 Replies)
The below command moves all the .vcf files into the directory.
cp /home/cmccabe/Desktop/test/vcf/overall/stats/*.vcf /home/cmccabe/Desktop/NGS/annovar
When I use a bash wrapper the target.txt gets created but the text files do not get copied. All the paths are the same, but not sure why... (2 Replies)
Hi; problem may be obvious, simple but I have to say it is somehow not easy to locate the issue.
I am doing some word extracting from multiline text.
Interacting in CLI seems to work without issues. First step is to add multiline text to a variable.
expect1.1>
expect1.1> set... (2 Replies)
Discussion started by: aldowski
2 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)