I have an application on Informix 4GL, and I am invoking the shell script from the program, but I need to know if the shell script work fine or not, in order to continue the process.
I know that we can use $? to get the final status but this is on unix command. How can I return a value from the... (3 Replies)
Hi,
Iam calling a C program from a Unix shell script. The (C) program reads encrypted username/password from a text file , decrypts and returns the decrypted string.
Is there any way i can return the decrypted string to Unix shell program.
My shell script uses the output of the program to... (11 Replies)
Hi everybody,
I have a script in which I'm invoking another script which runs in a subshell.
after the script is executed I want to return to the parent shell as some variables are set. However i'm unable to return to my original shell as the script which i'm calling inside is invoked in... (5 Replies)
Hi,
I'm having a requirement where I need to call a C program from a shell script and return the value from the C program to shell script.
I refered a thread in this forum. But using that command in the code, it is throwing an error
clear_text_password=$(get_password)
Error: bash:... (24 Replies)
Can anybody pls look into this script and tell me where I went wrong. After running this script, it is showing like "Trying to overlay current working directory ABORT!!!"
:-(
ARGCNT=$#
if
then
echo "Two parameters are needed for this shell "
echo "Please try again with... (1 Reply)
Hi,
I have a shell script which is residing on AIX which is triggered by Mainframe through Connect Direct. The shell script creates several files and sends those files to mainframe using Connect Direct. The shell script is working fine, still it is returning exit code 2 to mainframe.
What... (0 Replies)
Found myself stuck on this seemingly trivial issue. I have this script which call other shell files to do their deeds. The shell files in turn call some other programs as well. My problem is that in two of these shell files, the control doesnt return to next command in script unless the Enter key... (2 Replies)
Hello All,
I have a UNIX script which will prepare anonymous oracle pl/sql block in a temporary file in run time and passes this file to sqlplus as given below.
cat > $v_Input_File 2>>$v_Log << EOF
BEGIN
EXECUTE IMMEDIATE 'ALTER SESSION FORCE PARALLEL DML PARALLEL 16';
EXECUTE... (1 Reply)
Hello All,
I have exactly same issue @vikas_trl had in following link:
https://www.unix.com/shell-programming-and-scripting/259854-control-not-returning-sqlplus-calling-unix-shell-script.html
I wonder if he or somebody else could find the issue's cause or the solution.
Any help would... (4 Replies)
Discussion started by: RicardoQ
4 Replies
LEARN ABOUT MOJAVE
exchangedata
EXCHANGEDATA(2) BSD System Calls Manual EXCHANGEDATA(2)NAME
exchangedata -- atomically exchange data between two files
SYNOPSIS
#include <unistd.h>
#include <sys/attr.h>
int
exchangedata(const char * path1, const char * path2, unsigned int options);
DESCRIPTION
The exchangedata() function swaps the contents of the files referenced by path1 and path2 in an atomic fashion. That is, all concurrent pro-
cesses will either see the pre-exchanged state or the post-exchanged state; they can never see the files in an inconsistent state. The data
in all forks is swapped in this way. The options parameter lets you control specific aspects of the function's behaviour.
Open file descriptors follow the swapped data. Thus, a descriptor that previously referenced path1 will now reference the data that's acces-
sible via path2, and vice versa.
In general, the file attributes (metadata) are not exchanged. Specifically, the object identifier attributes (that is, the ATTR_CMN_OBJID
and ATTR_CMN_OBJPERMANENTID attributes as defined by the getattrlist(2) function) are not swapped. An exception to this general rule is that
the modification time attribute ( ATTR_CMN_MODTIME ) is swapped.
When combined, these features allow you to implement a 'safe save' function that does not break references to the file (for example,
aliases). You first save the new contents to a temporary file and then exchange the data of the original file and the temporary. Programs
that reference the file via an object identifier will continue to reference the original file, but now it has the new data.
The path1 and path2 parameters must both reference valid files. All directories listed in the path names leading to these files must be
searchable. You must have write access to the files.
The options parameter is a bit set that controls the behaviour of exchangedata(). The following option bits are defined.
FSOPT_NOFOLLOW If this bit is set, exchangedata() will not follow a symlink if it occurs as the last component of path1 or path2.
RETURN VALUES
Upon successful completion a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
COMPATIBILITY
Not all volumes support exchangedata(). You can test whether a volume supports exchangedata() by using getattrlist(2) to get the volume
capabilities attribute ATTR_VOL_CAPABILITIES, and then testing the VOL_CAP_INT_EXCHANGEDATA flag.
ERRORS
exchangedata() will fail if:
[ENOTSUP] The volume does not support exchangedata().
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a path name exceeded NAME_MAX characters, or an entire path name exceeded PATH_MAX characters.
[ENOENT] Either file does not exist.
[EACCES] Search permission is denied for a component of the path prefix.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EFAULT] path1 or path2 points to an invalid address.
[EXDEV] path1 and path2 are on different volumes (mounted file systems).
[EINVAL] path1 or path2 reference the same file.
[EINVAL] You try to exchange something other than a regular file (for example, a directory).
[EIO] An I/O error occurred while reading from or writing to the file system.
SEE ALSO getattrlist(2), rename(2)HISTORY
A exchangedata() function call appeared in Darwin 1.3.1 (Mac OS X version 10.0). It was deprecated in macOS 10.13.
Darwin December 15, 2003 Darwin