07-23-2019
Have a look in the manual page for ps for a variety of options. You can ask (with the -o option) for various items of output.
Please can you post your OS name and version. There are differences between them, so it's important to know which you have.
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1. Shell Programming and Scripting
Hi
I'm writing a script and I've put #!/bin/bash as the first line so that I can just type my scripts name 'whodate' at PS1 instead of ./whodate. This has suddenly stopped working for me. It used to be the case that I could start a script with #!/bin/bash and it would work, but for this script... (2 Replies)
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2. Shell Programming and Scripting
Is it possible with a bash variable to perform multiple substitution strings to one variable?
I have this variable:
echo $clock
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i am having a weird error on mac os x running some shell scripts. i am a complete newbie at this and this question concerns 2 scripts. one of which a friend of mine wrote (videochecker.sh) a couple weeks ago and it's been running fine on another machine.
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#!/bin/ksh
echo -en "\033|||'-'))
echo -e "\033
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5. Shell Programming and Scripting
THANKS UNIX SYSTEM®.I was found my job from UNIX®.I USE MONKEY WRENCH WITH WARTER.I am now studying my studio with UNIX SYSTEM®.
THANKS UNIX SYSTEM®.
THANKS OUR OPEN GROUP.
from Takayasu Sakashita.My name is Takayasu Sakashita.
I respect you.
Austin.PEACE!Bey bey.
Your friend TAKA.Good... (1 Reply)
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6. Shell Programming and Scripting
I need decimal comparing with if. Check if apache version is less than 2.2.17.
I tried this and not working.
#!/bin/bash
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if ]; then
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Hello,
I am showing the start of my script.
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This in a terminal is very quick '/opt/vc/bin/vcgencmd get_camera'.
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Regards
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So I'm trying to pass certain json elements as env vars and use them later on in a script.
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(part of the) script:
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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)