In ksh/bash use the following at the command line (or in ~/.profile or ~/.bash_profile):
If your on linux, Mac OS, *BSD you can put the following in ~/.inputrc (or /etc/inputrc for system wide), this will work for most command line programs that use the readline library (eg ftp, bash, etc).
Last edited by Chubler_XL; 05-30-2012 at 11:25 PM..
I want to be able to run a script on one server, that will spawn another shell which runs some commands on another server..
I have seen some code that may help - but I cant get it working as below:
spawn /usr/bin/ksh
send "telnet x <port_no>\r"
expect "Enter command: "
send "LOGIN:x:x;... (2 Replies)
Hi ,
I am having one situation in which I need to run some simple unix commands after doing "chroot" command in a shell script. Which in turn creates a new shell.
So scenario is that
- I need to have one shell script which is ran as a part of crontab
- in this shell script I need to do a... (2 Replies)
I am doing this simple script using c shell and korn shell. The commands I use are fgrep , ls, and also some redirecting. Is there any difference in using both of these commands in c shell and korn shell? Thanks and sorry for the stupid question. (1 Reply)
I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little... (1 Reply)
Hi,
I am facing a problem to pass command line arguments that looks like
<script name> aa bb "cc" dd "ee"
I want to pass all 5 elements include the " (brackets). when I print the @ARGV the " disappear. I hope I explain myself
Regards,
Ziv (4 Replies)
I want to substitute a charactor "PAN" with "TAN" in a shell, I used sed command in shell, it wo'nt work but the same is run from command prompt it was successful. the command is
sed ' s/PAN/TAN/g ' <i/p> > <o/p>
sed ' s/^M/^M/g ' <i/p> > <o/p> (1st ^M is Ctrl+V+M, 2nd should be line feed/next... (2 Replies)
Okay so I'm making a simple text based game that branches into different scenarios. By branching I mean branching off into whole different files with that part of the game in it. I got tired of working on scenario 1 so I'm working on scenario 2. As I get started and try to test it, I get an... (3 Replies)
Hello,
I know this is a situation about the single quote and double literal, but I could not figure out after many search.
I need to loop through thousands of different BACs sequencing to optimize kmer individually.
IN=/PATH/TO/INPUT/FILES
for sample in S{01..1096}
do
run_program... (9 Replies)
Hello,
I have symbolic links to a bunch of directories (all starting with the letter X) in the cwd. When I run the following on the command line, I get the list as I want it.
ls -1 X* > dir.list
However when I run it in a shell script like given below, it lists all the files in each of... (3 Replies)
Dear All,
I have 2 files namely file1 and file2.
in file1 I have something like this
Min X = -250.000000, Max X = 250.000000
Min Y = -95.000000, Max Y = 95.000000
Min Z = -95.000000, Max Z = 136.500000
I have to write this date to file2 as
xMin -250.000000;
xMax 250.000000;
yMin... (15 Replies)
Discussion started by: linuxUser_
15 Replies
LEARN ABOUT REDHAT
system
SYSTEM(3) Linux Programmer's Manual SYSTEM(3)NAME
system - execute a shell command
SYNOPSIS
#include <stdlib.h>
int system(const char *string);
DESCRIPTION
system() executes a command specified in string by calling /bin/sh -c string, and returns after the command has been completed. During
execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored.
RETURN VALUE
The value returned is -1 on error (e.g. fork failed), and the return status of the command otherwise. This latter return status is in the
format specified in wait(2). Thus, the exit code of the command will be WEXITSTATUS(status). In case /bin/sh could not be executed, the
exit status will be that of a command that does exit(127).
If the value of string is NULL, system() returns nonzero if the shell is available, and zero if not.
system() does not affect the wait status of any other children.
CONFORMING TO
ANSI C, POSIX.2, BSD 4.3
NOTES
As mentioned, system() ignores SIGINT and SIGQUIT. This may make programs that call it from a loop uninterruptable, unless they take care
themselves to check the exit status of the child. E.g.
while(something) {
int ret = system("foo");
if (WIFSIGNALED(ret) &&
(WTERMSIG(ret) == SIGINT || WTERMSIG(ret) == SIGQUIT))
break;
}
Do not use system() from a program with suid or sgid privileges, because strange values for some environment variables might be used to
subvert system integrity. Use the exec(3) family of functions instead, but not execlp(3) or execvp(3). system() will not, in fact, work
properly from programs with suid or sgid privileges on systems on which /bin/sh is bash version 2, since bash 2 drops privileges on
startup. (Debian uses a modified bash which does not do this when invoked as sh.)
The check for the availability of /bin/sh is not actually performed; it is always assumed to be available. ISO C specifies the check, but
POSIX.2 specifies that the return shall always be non-zero, since a system without the shell is not conforming, and it is this that is
implemented.
It is possible for the shell command to return 127, so that code is not a sure indication that the execve() call failed.
SEE ALSO sh(1), signal(2), wait(2), exec(3)
2001-09-23 SYSTEM(3)