I'm calling a program with a command line arguement containing a password. while the process is running anyone on the system can ps -ef and see the password. Is there a way to prevent this from happening.
example
PROGRAM USERNAME/PASSWD
I've also tried
PROGRAM `cat passfile`
... (7 Replies)
Hi , Could you tell me if I am right
1. Using fork(), pipe(), execlp() and dup() (see man 2 dup), write a C program executing the command ps -j in a parent process, displaying the result in a child process.
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>... (7 Replies)
Hi
I have a shell script A which calls another 10 shell scripts which run in background. How do i make the parent script wait for the child scripts complete, or in other words, i must be able to do a grep of parent script to find out if the child scripts are still running.
My Code:
... (1 Reply)
Hi All,
I have a script which calls a child script with a parameter to be run in the background
. childscript.ksh $a &
Can any one suggest me how do i export a variable from the child script to parent script?
Note that the child script is in background
If the child script is in... (3 Replies)
Hello. A bit of a puzzle here:
I have a 3rd party executable, which requires the following parameters:
parm1 = program_name, parm2=userid/password, parm3=additional flags.
We tried passing password as a variable, but you can do grep, and see what the password actually is
I found a bit... (2 Replies)
class B
{
public:
void fns(void){//base def;}
};
class D:public B
{
public:
void fns(void) {//new def;}
};
I was thinking the above is overriding but somewhere else i found the above is just hiding.Only virtual functions can be considered as overriding?
This is the exact statement ... (1 Reply)
1. The problem statement, all variables and given/known data:
I need to make an program that in a loop creates one parent and five children with fork(). The problem i'm trying to solve is how to delete the parent and child of the childīs process.
2. Relevant commands, code, scripts,... (0 Replies)
Hi everyone
i am very new to linux , working on bash shell.
I am trying to solve the given problem
1. Create a process and then create children using fork
2. Check the Status of the application for successful running.
3. Kill all the process(threads) except parent and first child... (2 Replies)
Hello All,
I am using Linux. I have two scripts:
inner_script.ksh
main_wrapper_calling_inner.ksh
Below is the code snippet of the main_wrapper_calling_inner.ksh:
#!/bin/ksh
ppids=() ---> Main array for process ids.
fppids=() ---> array to capture failed process ids.
pcnt=0 --->... (5 Replies)
Discussion started by: dmukherjee
5 Replies
LEARN ABOUT V7
pnmcrop
pnmcrop(1) General Commands Manual pnmcrop(1)NAME
pnmcrop - crop a portable anymap
SYNOPSIS
pnmcrop [-white|-black|-sides] [-left] [-right] [-top] [-bottom] [pnmfile]
All options may be abbreviated to their shortest unique prefix or specified with double hyphens.
DESCRIPTION
Reads a PBM, PGM, or PPM image as input. Removes borders that are the background color, and produces the same type of image as output.
If you don't specify otherwise, pnmcrop assumes the background color is whatever color the top left and right corners of the image are and
if they are different colors, something midway between them. You can specify that the background is white or black with the -white and
-black options or make pnmcrop base its guess on all four corners instead of just two with -sides.
By default, pnmcrop chops off any stripe of background color it finds, on all four sides. You can tell pnmcrop to remove only specific
borders with the -left, -right, -top, and -bottom options.
If you want to chop a specific amount off the side of an image, use pnmcut.
If you want to add different borders after removing the existing ones, use pnmcat or pnmcomp.
OPTIONS -white Take white to be the background color. pnmcrop removes borders which are white.
-black Take black to be the background color. pnmcrop removes borders which are black.
-sides Determine the background color from the colors of the four corners of the input image. pnmcrop removes borders which are of the
background color.
If at least three of the four corners are the same color, pnmcrop takes that as the background color. If not, pnmcrop looks for two
corners of the same color in the following order, taking the first found as the background color: top, left, right, bottom. If all
four corners are different colors, pnmcrop assumes an average of the four colors as the background color.
The -sides option slows pnmcrop down, as it reads the entire image to determine the background color in addition to the up to three
times that it would read it without -sides.
-left Remove any left border.
-right Remove any right border.
-top Remove any top border.
-bottom
Remove any bottom border.
-verbose
Print on Standard Error information about the processing, including exactly how much is being cropped off of which sides.
SEE ALSO pnmcut(1), pnmfile(1), pnm(5)AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
18 March 2001 pnmcrop(1)