"But it doesn't works..." is not something people can start working / analysing / debugging upon. Be more precise / descriptive; include error messages, warnings, non-satisfying output, etc.
hi.i want to create a bash script called countfiles.sh, that will count the pack of files under the current file that their term satisfy a specific pattern. The script must show the total per file or on the whole.
thank tou (4 Replies)
Hey guy,
how to make bash script to create foo.txt file and add current date into file content and that file always append.
example: today the script run and add today date into content foo.txt
and tomorrow the script will run and add tomorrow date in content foo.txt without remove today... (3 Replies)
hi all
I am new to unix and want to create a loop to repeat the loop and before that it ask me to do so.I know "while" may help but I put it in my work and getting stuk with it.any help appreciated. (13 Replies)
Hi ,
please guide me for a bash script that will create a txt files and the name of the txt files will be as of timestamp so that each file name will be different from other and these files will be get created say after every 10 minutes in a folder(/home/p2000/sxs137), please guide me how would... (1 Reply)
Hi Guys,
I have file A.txt
File A Data
AK1521
AK2536
AK3164
I want create text file of all data above and write some data on each file.
want Output on below folder
/home/kka/out
AK1521.txt
Hi
Welocme (3 Replies)
My Calling script is like below:
for file in `echo $LIST_OF_FILES` --listing filenames eg, xyz_meta_20110501_00000789.tar
do
file_name=`basename $file`
<call a function to create .txt file in below format>
done
Want to generate a .txt file that contains below data in ksh:
... (3 Replies)
Hi,
I need to create a .csv file from information that i have in two different tab delimited .txt file. I just want to select some of the columns of each .txt file and paste them into a .cvs file.
My files look like:
File 1
transcript_id Seq. Description Seq. Length ... (2 Replies)
I have created one file that contains all the necessary info in it to create a download link. In each of the lines /results/analysis/output/Home/Auto_user_S5-00580-6-Medexome_67_032/plugin_out/FileExporter_out.67... (8 Replies)
I have a txt file with a list of error messages in a xml tag format, and each error message is separated with a identifier(endresult).Need to split that and copy and create a new html file.Error message has some special character. how to escape the special character and insert my data into the... (7 Replies)
Discussion started by: DevAakash
7 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)