Hi want to know the syntax of printing something (value or variable) in GNU make utility. I give this in the Makefile:
echo "Hi"
OR
@echo "Hi"
But I only get error this when I run make (at the line where I have echo):
Makefile:9: *** missing separator. Stop.
Whats the problem? How can... (2 Replies)
Pls help me on this. I have to 2 files like shown below:
File 1
TAIJM
AXPKIM
BEMGW
File 2
PXMPA
JYGE
IMJP
What i want to do is to paste both file to a new file on thir format:
File 3
TAIJM PXMPA
AXPKIM JYGE
BEMGW IMJP
I tried cat and print, but it doesn't work. Cn... (6 Replies)
How I can get the current make-file name in a make-file
So, if I run make with specified file:make -f target.mak
is it possible to have the 'target' inside of the that 'target.mak' from the file name? (2 Replies)
print "1.readfromfile\n2.add_ex1(4,5)\n3.add_ex2(11,5)\n4.add_ex3(9,3)\n5.add_ex4(91,4)\n";
How to do it in this form:
print "1.readfromfile\n
2.add_ex1(4,5)\n
3.add_ex2(11,5)\n
4.add_ex3(9,3)\n
5.add_ex4(91,4)\n"; (3 Replies)
I decided I wanted to have the cd command print my full working directory after each cd command, so I put this cw command in .bashrc as a function.
cw ()
{
cd "${1}"
pwd
}While this works I would like pwd to print escapes when a space in a directory name exists. This would... (7 Replies)
FILE_ID extraction from file name and save it in CSV file after looping through each folders
My files are located in UNIX Server, i want to extract file_id and file_name from each file .and save it in a CSV file. How do I do that?
I have folders in unix environment, directory structure is... (15 Replies)
Hi All,
Please help.
I have got a file which contains a listing of a file and some directories after it, one by one. I am calling this file xyz.txt here
file1
dir1
dir2
dir3
dir4
file2
dir5
dir6
dir7
dir8
file3
dir9
dir10
dir11
dir12 (6 Replies)
Hello,
I am re-processing some files when a specific condition is met. The condition is read from the filename. Since files may need to be re-processed a number of times before they no longer meet the condition, I need to know when to stop re-processing. I am having trouble visualizing the... (3 Replies)
Hello ppl
I have a requirement to split (cut in unix) a file (A.txt) which is a pipe delimited file into A1.txt and A2.txt
Now I have to join (paste in unix) this A2.txt with external file A3.txt to form
output file A4.txt which should be CSV (comma separated file) so that third party can... (25 Replies)
Using Python
I have 2 text files (big files over 1gb) that opens side by side on the same line in terminal, but I want the file on the right to print down the other file while the file on the left is stationary or displayed all at once. I want to print text file 2 through all of text file 1.
... (6 Replies)
Discussion started by: bigvito19
6 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)