jim mcnamara -
thank you, very much, everything clear and usefull for me now!
I am realy exiting to understand it. Now I have new (for me ) possibility in scripting and in shell.
Definetely, 'eval' gives usefull opportunity!
The 'exec' - nice to know that and it is good to use it, too.
The 'sorce' - it appeared that I have used it already for long time (as '. script') but did not realized tha all definishions of the curent shell are available in runing script by that (other part - backward - usualy is a reason to use the '. scr')
I've just tryed it and maybe it would be usefull to show it here, too, although your explanation pretty enough, but, anyway, here it is:
I am using ksh88 and I am trying to catch the return status of opening a file using a file descriptor and the exec and eval commands. However I am not having much success. Here is what I have:
eval "exec $next_fh>$1"
This opens the file if the file is $1 is valid, however I want to make... (1 Reply)
Hi everybody !
I writed php code so exec bash shell via php (SMS Send via bash shell) but i have problem as follow :
1. When i exec from linux mode : ./sms.sh --- output is "Messages ... OK". Then all message has been sent.
2. When i exec from PHP site --- return value is "Message ... OK" on... (1 Reply)
how does exec() do it? on successful call of exec() family of functions, they never return...
how to i emulate that.
assume the standard example,
execl("/bin/ls","ls",NULL);
now this would never return.
i m trying to emulate exec()'s never to return feature...
#include<unistd.h>... (4 Replies)
I do not claim to be an expert, but I have done things with scripts that whole teams of folks have said can not be done. Of course they should have said we do not have the intestinal fortitude to git-r-done.
I have been using UNIX actually HPUX since 1992. Unfortunately my old computer died and... (7 Replies)
Okay so I am just starting programming c++. I just started started to red "C++ for Dummies yesterday and theres a lot of things I do not understand from this book and this source code especially. I will first post the full source code and then post questions about certain thing, usually what they... (2 Replies)
Hi
i am in learning phase of unix.
i was going through exec in a unix book. below is the command
exec n>file
exec n>>file
however when i used the exec command like below , where ex is the file name
exec 2>>exand then do ls -lrt then again when i do the ls -lrt to see the size of the file... (3 Replies)
Working on some source I've found some strange declaration in included header file.
I am looking for someone's help to understand me that syntax's, as it is fine (it is compiled without any complain,) but for me it seems out of any sense!
Acctually, it warning by CC compiler: " Warning: Implicit... (1 Reply)
Just began to learn on Shell Script. I got an exercise from my friend. I know how to make this happen in C, but I'm not familiar with Shell Script. Hope I can get some help from all of you.
I want to write a bash script to comment code blocks in a bash source file. What I mean comment is '#', I... (1 Reply)
I am still learning shell scripting. Recently I see a function for read configuration. But some of special character make me confused. I checked online to find answer. It was not successful. I post the code here to consult with expert or guru to get better understanding on these special characters... (3 Replies)