The above comments are very important to understand, but a subshell will actually spawn a new shell process. For example, time the two following scripts to see which is faster:
#1
#2
I should mention that I cannot test this at the moment, so I might be giving a bad example...
consider the given prg.
main() {
.....
function1(); /* to write into a file or log */
printf(" ");
.....
}
when the control reaches function1(), it should get executed in the
background.At the same time main's printf(" ") statement should also get executed.i.e... (5 Replies)
Hi all,
I am kinda new to this unix environment, and now I get confused to figure out this alias problem. I would like to make my xemacs to run in background every call, and I am trying to do it this way in .bashrc
alias e='xemacs &* & '
i also tried
e () { xemacs "&*" &}
but they are... (0 Replies)
Dear all,
I'm writing a KornShell script that calls inside it a function in background mode
#!/bin/ksh
function myfunction
{ . . .}
myfunction |&
. . .
How can I capture the PID of the function myfunction that runs in background?
Thanks in advance
:) (2 Replies)
Our Aix Unix has one issue.
If I type xedit &
after 30 minutes, xedit auto shut down.
If I type xedit
xedit will run forward.
I feel this & doesn't perform as it should be.
When I use &, system consider this process as idle.
How to fix this issue?
Does this mean unix env... (12 Replies)
Somebody on a thread in the (french) Mandriva Forum recently suggested a script, designed to provide a tool to display kind of "temporisation widgets" on the console (to be ultimately pasted in other more complex scripts).
One version of this script was something like the following, which seems... (6 Replies)
Here is some back ground on the script. The script is to poll an arbitrary number of DB's. To do this I am creating a function that takes the file_path to the DB and the min poll interval as arguments. The function will be called for each DB and then ran in the background. The function I was... (6 Replies)
Hello Everyone,
I am writing a shell script to fetch log files from remote servers within a time range. It copies log files to local server, grep for date and then compares the time stamp of each log entry with the once specified.
Below is the code.
# Get log and Parsing function
... (1 Reply)
Hello, I'm currently implementing the && function in a shell using C. For example, if we input cmd1 && cmd2, then cmd2 executes only when cmd1 exits successfully. I'm thinking about:
int main() {
int i;
char **args;
while(1) {
printf("yongfeng's shell:~$ ");
args =... (5 Replies)
Hi,
I have created a function f1 defined in script A.sh .I have called this function in background . But I want to use its return value for another function f2 in script A.sh.
I tried declaring it as a global variable, yet it always returns the status as 0. Is there any way with which I can get... (7 Replies)
Discussion started by: ashima jain
7 Replies
LEARN ABOUT SUNOS
setusershell
getusershell(3C) Standard C Library Functions getusershell(3C)NAME
getusershell, setusershell, endusershell - get legal user shells
SYNOPSIS
#include <unistd.h>
char *getusershell(void);
void setusershell(void);
void endusershell(void);
DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If
/etc/shells does not exist, the following locations of the standard system shells are used in its place:
/bin/bash /bin/csh
/bin/jsh /bin/ksh
/bin/pfcsh /bin/pfksh
/bin/pfsh /bin/sh
/bin/tcsh /bin/zsh
/sbin/jsh /sbin/pfsh
/sbin/sh /usr/bin/bash
/usr/bin/csh /usr/bin/jsh
/usr/bin/ksh /usr/bin/pfcsh
/usr/bin/pfksh /usr/bin/pfsh
/usr/bin/sh /usr/bin/tcsh
/usr/bin/zsh /usr/xpg4/bin/sh
The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.
The setusershell() function rewinds the file or the list.
The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.
RETURN VALUES
The getusershell() function returns a null pointer on EOF.
BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.
SunOS 5.10 30 Aug 2004 getusershell(3C)