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1. UNIX for Advanced & Expert Users
Hi there,
When I am trying to execute any shell script.
The shell script only execute line 1 and I notice that the rest o the program was not executed. Please advise.
# bash +x vmscript-4.sh
Even when I enter this command there is not output.
sudo su
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2. Shell Programming and Scripting
Hi Experts,
I am creating a script to monitor a certain applications running in my Unix system.
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3. Ubuntu
My professor gave me a code with no errors.
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line 3: syntax error near unexpected token '('
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4. Shell Programming and Scripting
Hi
I have the following script:
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5. Shell Programming and Scripting
Hi
I want to create a shell script tha executes a C program and then retrieves information about it.
I managed to run the program with:
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6. UNIX for Dummies Questions & Answers
Hi,
I am a complete newbie for unix. I have just installed mysql on my MAC. I was wondering every time I wanted to use mysql I had to ./mysql or sh mysql everytime on /usr/local/bin/mysql/bin. How can I execute the mysql program without using ./ or sh. I chmod +x already. And what do I have to... (3 Replies)
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7. Shell Programming and Scripting
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8. Linux
hi all.
I have a small program on a debian server which i need to execute remotely from a windows machine using putty.
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9. UNIX for Dummies Questions & Answers
Hi,
i want to write a script that executes a program (exec?) .
this program then requires a filename as input.
how do i give it this input in the script so the program will be complete run and close by the script.
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exec prog.exe
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10. Shell Programming and Scripting
Filesystem 1024-blocks Free %Used Iused %Iused Mounted on
/dev/hd4 32768 16016 52% 2271 14% /
/dev/hd2 4587520 1889420 59% 37791 4% /usr
/dev/hd9var 65536 12032 82% 518 4% /var
/dev/hd3 819200 637832 ... (1 Reply)
Discussion started by: sathyaac
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EXEC(3) BSD Library Functions Manual EXEC(3)
NAME
execl, execlp, execle, exect, execv, execvp -- execute a file
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
extern char **environ;
int
execl(const char *path, const char *arg, ...);
int
execlp(const char *file, const char *arg, ...);
int
execle(const char *path, const char *arg, ..., char *const envp[]);
int
exect(const char *path, char *const argv[], char *const envp[]);
int
execv(const char *path, char *const argv[]);
int
execvp(const char *file, char *const argv[]);
DESCRIPTION
The exec family of functions replaces the current process image with a new process image. The functions described in this manual page are
front-ends for the function execve(2). (See the manual page for execve(2) for detailed information about the replacement of the current
process. The script(7) manual page provides detailed information about the execution of interpreter scripts.)
The initial argument for these functions is the pathname of a file which is to be executed.
The const char *arg and subsequent ellipses in the execl(), execlp(), and execle() functions can be thought of as arg0, arg1, ..., argn.
Together they describe a list of one or more pointers to null-terminated strings that represent the argument list available to the executed
program. The first argument, by convention, should point to the file name associated with the file being executed. The list of arguments
must be terminated by a NULL pointer.
The exect(), execv(), and execvp() functions provide an array of pointers to null-terminated strings that represent the argument list avail-
able to the new program. The first argument, by convention, should point to the file name associated with the file being executed. The
array of pointers must be terminated by a NULL pointer.
The execle() and exect() functions also specify the environment of the executed process by following the NULL pointer that terminates the
list of arguments in the parameter list or the pointer to the argv array with an additional parameter. This additional parameter is an array
of pointers to null-terminated strings and must be terminated by a NULL pointer. The other functions take the environment for the new
process image from the external variable environ in the current process.
Some of these functions have special semantics.
The functions execlp() and execvp() will duplicate the actions of the shell in searching for an executable file if the specified file name
does not contain a slash ``/'' character. The search path is the path specified in the environment by the PATH variable. If this variable
isn't specified, _PATH_DEFPATH from <paths.h> is used instead, its value being: /usr/bin:/bin:/usr/pkg/bin:/usr/local/bin. In addition, cer-
tain errors are treated specially.
If permission is denied for a file (the attempted execve(2) returned EACCES), these functions will continue searching the rest of the search
path. If no other file is found, however, they will return with the global variable errno set to EACCES.
If the header of a file isn't recognized (the attempted execve(2) returned ENOEXEC), these functions will execute the shell with the path of
the file as its first argument. (If this attempt fails, no further searching is done.)
If the file is currently busy (the attempted execve(2) returned ETXTBUSY), these functions will sleep for several seconds, periodically re-
attempting to execute the file.
The function exect() executes a file with the program tracing facilities enabled (see ptrace(2)).
RETURN VALUES
If any of the exec functions returns, an error will have occurred. The return value is -1, and the global variable errno will be set to
indicate the error.
FILES
/bin/sh The shell.
ERRORS
execl(), execle(), execlp() and execvp() may fail and set errno for any of the errors specified for the library functions execve(2) and
malloc(3).
exect() and execv() may fail and set errno for any of the errors specified for the library function execve(2).
SEE ALSO
sh(1), execve(2), fork(2), ptrace(2), environ(7), script(7)
COMPATIBILITY
Historically, the default path for the execlp() and execvp() functions was ``:/bin:/usr/bin''. This was changed to improve security and be-
haviour.
The behavior of execlp() and execvp() when errors occur while attempting to execute the file is historic practice, but has not traditionally
been documented and is not specified by the POSIX standard.
Traditionally, the functions execlp() and execvp() ignored all errors except for the ones described above and ENOMEM and E2BIG, upon which
they returned. They now return if any error other than the ones described above occurs.
STANDARDS
execl(), execv(), execle(), execlp() and execvp() conform to ISO/IEC 9945-1:1990 (``POSIX.1'').
BSD
May 6, 2005 BSD