Hi guys;
I want to show what am I doing on a terminal into another. I did something close but its not working really good.
Example: cat /dev/pts/12 >/dev/pts/13
where 12 is my terminal and 13 its the other terminal.
This is usefull for me to share my small unix knowledge to other people... (4 Replies)
ssh $USR@$host /bin/bash <<EOF
awk ' BEGIN{f=0} !f { s=$0; sub(/,.+/, "", s); gsub(//, " ", s); t=(systime()-mktime(s)); if(t<=14400) f=1 } f ' /home/error.log >> error.txt
EOFWe are trying to connect to a remote server through ssh and read values from error.log within last 4 hours.However, the... (3 Replies)
Hi
Can i ask?
I had multiple solaris workstation running and some local users using it. Is it possible to bind to the local user terminal or console he's using as if like the user well type and I can see it and what my typing in the local user see it also.
Is it possible..
Thanks. (3 Replies)
Hi,
I want to save the whole Output of the terminal in a file. I dont want to redirect a single command to a file (ls -l > test.txt), I want to redirect the whole last 40 lines into a file.
Maybe i can read out the terminal while working with it, but i cant find a way to save the whole... (2 Replies)
Hello everybody,
I'm testing some aspects of X Terminal implementation and it's going great. I can use remote applications on my local slow workstation at remote's processor speed by redirecting the remote DISPLAY variable to "my_local_ip:0.0"; but i'm having troubles to get remote audio and... (2 Replies)
When ever i started my terminal,Every time I have to change the directory like "cd user/documents/ravi/folder2/folder3" Without typing this entire command every time ,I placed "alias c='cd user/documents/ravi/folder2/folder3'" in .bash_profile file. so that i can able to execute command 'c'... (6 Replies)
Im using a X-Terminal in my windows pc to connect to a Linux server.
Is there a way to know my local IP address in my x-terminal console?
Here are few commands which didnt help me:
ss_cc@MGTS5026-13sh1:~> finger
Login Name Tty Idle Login Time Where
loadhlr ... (6 Replies)
I have been having an extremely annoying problem. For the record, I am relatively new at this. I've only been working with unix-based OS's for roughly two years, mostly Xubuntu and some Kali. I am pretty familiar with the BASH language, as that's the default shell for debian. Now, I've made this... (16 Replies)
when i do something like this:
bona=$(echo hi2 > /dev/pts/1 ; printf '%s\n' "" | sed '/^$/d')
i get:
hi2
and the $bona variable is empty, when I run:
echo ${bona}
i get the result "hi2" outside of the variable. I want it stored in the bona variable with nothing outputted to the... (6 Replies)
Discussion started by: SkySmart
6 Replies
LEARN ABOUT MOJAVE
popen
POPEN(3) BSD Library Functions Manual POPEN(3)NAME
pclose, popen -- process I/O
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
FILE *
popen(const char *command, const char *mode);
int
pclose(FILE *stream);
DESCRIPTION
The popen() function ``opens'' a process by creating a bidirectional pipe, forking, and invoking the shell. Any streams opened by previous
popen() calls in the parent process are closed in the new child process. Historically, popen() was implemented with a unidirectional pipe;
hence, many implementations of popen() only allow the mode argument to specify reading or writing, not both. Because popen() is now imple-
mented using a bidirectional pipe, the mode argument may request a bidirectional data flow. The mode argument is a pointer to a null-termi-
nated string which must be 'r' for reading, 'w' for writing, or 'r+' for reading and writing.
The command argument is a pointer to a null-terminated string containing a shell command line. This command is passed to /bin/sh, using the
-c flag; interpretation, if any, is performed by the shell.
The return value from popen() is a normal standard I/O stream in all respects, save that it must be closed with pclose() rather than
fclose(). Writing to such a stream writes to the standard input of the command; the command's standard output is the same as that of the
process that called popen(), unless this is altered by the command itself. Conversely, reading from a ``popened'' stream reads the command's
standard output, and the command's standard input is the same as that of the process that called popen().
Note that output popen() streams are fully buffered, by default.
The pclose() function waits for the associated process to terminate; it returns the exit status of the command, as returned by wait4(2).
RETURN VALUES
The popen() function returns NULL if the fork(2) or pipe(2) calls fail, or if it cannot allocate memory.
The pclose() function returns -1 if stream is not associated with a ``popened'' command, if stream already ``pclosed'', or if wait4(2)
returns an error.
ERRORS
The popen() function does not reliably set errno.
SEE ALSO sh(1), fork(2), pipe(2), wait4(2), fclose(3), fflush(3), fopen(3), stdio(3), system(3)BUGS
Since the standard input of a command opened for reading shares its seek offset with the process that called popen(), if the original process
has done a buffered read, the command's input position may not be as expected. Similarly, the output from a command opened for writing may
become intermingled with that of the original process. The latter can be avoided by calling fflush(3) before popen().
Failure to execute the shell is indistinguishable from the shell's failure to execute command, or an immediate exit of the command. The only
hint is an exit status of 127.
The popen() function always calls sh(1), never calls csh(1).
HISTORY
A popen() and a pclose() function appeared in Version 7 AT&T UNIX.
Bidirectional functionality was added in FreeBSD 2.2.6.
BSD May 3, 1995 BSD