04-21-2002
execl, execv or execp
Hi!
I'm writing a C program which gets from the command line a shell command (such as "ls" ) and I should execute it.
My Q is: how can I send a command to the shell?
I know I have to use one of the above functions, but I don't know how to use them.
Thanks
eyal
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
what's the difference between the two? (3 Replies)
Discussion started by: hurleyint1386
3 Replies
2. Programming
Hi,
Is it possible to run a program from my C program using only the full pathname?
for example if I wanna call: "ls", so I whould have to use:
execl("/bin/ls", "ls", NULL);
Is it possible to do this using only:
"/bin/ls"
thanks (1 Reply)
Discussion started by: owijust
1 Replies
3. Programming
can anyone explain how to pass arguments of a program in execl function
pls explain with a sample code. (2 Replies)
Discussion started by: bankpro
2 Replies
4. Shell Programming and Scripting
I want to make simultanous sh commands in an exec command
for example I want to counts the lines in a file
wc -l my file.txt | awk -F" " '{print $1}'` works fine in sh but I want to implement it in a c code
the first part works like this
execl("/usr/bin/wc", "wc", "-l", "myfile.txt",... (1 Reply)
Discussion started by: walnut
1 Replies
5. Programming
hello everybody
how can i time the execution of execl() command inside my C code?
for example, i wrote..
execl("md5sum","md5sum","myprog",NULL);
i want to count the duration of the execl command!
thanx in advance! (2 Replies)
Discussion started by: nicos
2 Replies
6. Red Hat
how to use find command in execl function,
I used:
execl("/usr/bin/find","find","~","-name","filename.c",0); but it shows
find: ~ no file and directory i need to get the path of the file from the home .:wall: (2 Replies)
Discussion started by: Mahendravarma
2 Replies
7. Programming
when execl fails using the command lss, it doesnt go into the next line
execl("/bin/sh", "/bin/sh", "-c", command, NULL);
perror("execl failed"); exit(127);
for some reason the child process just stops and also the parent process also stops
so the line after the line that... (3 Replies)
Discussion started by: omega666
3 Replies
8. Programming
Hi, I have two programs, one is named "Master" and the other one "slave". What I want to do is , when I execute Master, inside slave will be called by excecl, do some calculations, and send those to the master program... A little example of what I am failing to do:
if ((PID1=fork())==0) { //... (6 Replies)
Discussion started by: lamachejo
6 Replies
9. Programming
Hi All,
I have a program for class that needs to do the following:
1. Print the directory entries from the current directory using ncurses
2. Provide a prompt next to each directory entry and allow the user to enter commands that may or may not be about the file
3. Execute those commands in... (1 Reply)
Discussion started by: afulldevnull
1 Replies
10. UNIX for Beginners Questions & Answers
Hi,
If I write in a c file :
execlp("date","date",NULL);
printf("A\n");
And then run through the terminal would "A" be printed ?
I understood that execlp will exit the program after it finished so the next lines of code won`t be executed afterwards.. Is that true ? (1 Reply)
Discussion started by: uniran
1 Replies
shell(1F) FMLI Commands shell(1F)
NAME
shell - run a command using shell
SYNOPSIS
shell command [command] ...
DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise
/usr/bin/sh).
EXAMPLES
Example 1: A sample output of shell command.
Since the Form and Menu Language does not directly support background processing, the shell function can be used instead.
`shell "build prog > /dev/null &"`
If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe-
cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to
save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing.
shell can also be used to execute a command that has the same name as an FMLI built-in function.
NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments
will not be expanded by the shell because "local" means "local to the current process."
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
sh(1), attributes(5)
SunOS 5.10 5 Jul 1990 shell(1F)