If a background process tries to read from the terminal, it will be stopped. This is normal terminal and shell behavior. Only foreground processes are allowed to control the terminal like that.
To prevent it from reading from the terminal, run it with nohup to prevent it from accessing the terminal. This will redirect stdin/stdout/stderr automatically. stdin will connect to /dev/null, while stdout and stderr will be saved to a file in the current directory.
I have been trying to get the output of an ssh session pushed to file... the problem is that there are colors in the output, and when I view the file the colors show up as "^[00m" or other such various nonsense
The weird part is that if I do this all manually, I have no problems, but if I try to... (0 Replies)
I have a simple csh-script on a Solaris Workstaion which invokes the bc calculator:
#!/bin/csh
set shz=2
set zshift=5
set shzp=`bc -l <<END \
scale = 3 \
-1. * $shz + $zshift \
END`
echo $shzp
The result ($shzp) in this case is 3 (-1*2+5). It works fine on Solaris 8.
... (2 Replies)
I am having hard time understanding what this really do to the environment? I do understand this part "tty -s && stty " but not "istrip"
# stty command is executed only if a tty is attached to the process.
# stty istrip : Strip input characters to 7 bits
tty -s && stty istrip
I am... (3 Replies)
I am trying to find the number of files whose name starts with uni.
Below is the code but it is giving error. :confused:
#!/bin/csh
FILES_NAME ='files_list';
FILE_NAME_PATTERN = 'uni*';
NO_OF_FILES;
ls -l $FILE_NAME_PATTERN > $FILES_NAME ;
NO_OF_FILES = `wc -l $FILES_NAME`;
echo... (3 Replies)
Hi,
I need your help to understand about different processes(tty1,tty2,tty3...) running as root as shown below .What exactly these processes do?
root@bisu-desktop:~# ps -eaf | grep -e tty -e UID
UID PID PPID C STIME TTY TIME CMD
root 761 1 0 10:30 tty5 ... (4 Replies)
Hi All,
I have a requirement where i need to NDM 3 files from LINUX to Mainframe system & trigger a job in mainframe once the 3 files are transmitted successfully.
I am getting an error message in the && operator (the code component where i am checking whether step 1/2/3 are completed).
... (2 Replies)
I'm having a strange problem with basic >& output redirection to a simple log file in csh. When I run this particular output redirection on the command line, it works, but then when I run the same output redirection command >& in my c shell script, I get a blank log file. Nothing is output to the... (5 Replies)
I am using an awk command to extract a particular portion of a string. Below is the command and its output on a Linux system:
oracle@host1:/tmp (/home/oracle)
$uname -a
Linux host1 2.6.32-279.39.1.el6.x86_64 #1 SMP Fri Nov 15 05:38:26 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
... (7 Replies)
i am new player in linux
what does mean ">& and >&!" in script or command line?
thanks (4 Replies)
Discussion started by: abdossamad2003
4 Replies
LEARN ABOUT BSD
nohup
NICE(1) General Commands Manual NICE(1)NAME
nice, nohup - run a command at low priority (sh only)
SYNOPSIS
nice [ -number ] command [ arguments ]
nohup command [ arguments ]
DESCRIPTION
Nice executes command with low scheduling priority. If the number argument is present, the priority is incremented (higher numbers mean
lower priorities) by that amount up to a limit of 20. The default number is 10.
The super-user may run commands with priority higher than normal by using a negative priority, e.g. `--10'.
Nohup executes command immune to hangup and terminate signals from the controlling terminal. The priority is incremented by 5. Nohup
should be invoked from the shell with `&' in order to prevent it from responding to interrupts by or stealing the input from the next per-
son who logs in on the same terminal.
FILES
nohup.out standard output and standard error file under nohup
SEE ALSO csh(1), setpriority(2), renice(8)DIAGNOSTICS
Nice returns the exit status of the subject command.
BUGS
Nice and nohup are particular to sh(1). If you use csh(1), then commands executed with ``&'' are automatically immune to hangup signals
while in the background. There is a builtin command nohup which provides immunity from terminate, but it does not redirect output to
nohup.out.
Nice is built into csh(1) with a slightly different syntax than described here. The form ``nice +10'' nices to positive nice, and ``nice
-10'' can be used by the super-user to give a process more of the processor.
4th Berkeley Distribution May 8, 1986 NICE(1)