I need some help to setup some environmental variables.
for example...Get A -> userdefined/user input
B -> a number.
c -> system variable...for example $GETCONF PAGE_SIZE
E = do some math using bc
display a message "The value is E"
setup the system/kernel paramter sysctl -p <parameter name> = E
setu of system/kernel paramter completed.
Here are some untested code snippets setting variables as you requested:
If you using a POSIX conforming shell (such as bash and ksh) and you're doing integer arithmetic, you don't need to call bc; you can use:
instead.
If you're doing floating point arithmetic and you're using a 1993 or later version of the Korn shell, you can still use the above arithmetic evaluation instead of calling bc, but you'll want to change the format for printing $E to a floating format such as:
where the number shown in red above specifies the number of digits you want to appear after the radix character in your output.
This User Gave Thanks to Don Cragun For This Post:
If have
var='$variable'
how can I expand $variable.
I have tried many thing like duble quotes/braces etc, but nothing worked.
I need the solution ASAP. (2 Replies)
Hi everybody:
I have a problem about use variables. I 've created this variable:
var=`wc -l file.txt | cut -c 1-2`;
n_var="$var"-1 ;
echo $n_var;
In my case var is 8.
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In a line such as:
echo -n "How many days back would you like to check? "; read days
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I am working on a SunFire 480 - uname -a gives:
SunOS bsmdb02 5.9 Generic_112233-08 sun4u sparc SUNW,Sun-Fire-480R
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#!/usr/bin/ksh
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Hi,
I am wondering what is the difference between the USER and LOGNAME environment variables, and under what situations would they be different?
I am using Ubuntu 8.04 32-bit and I do not have 'login' command to test it. (7 Replies)
I need some help to write a ksh script.
My code so far (pretty bad, sorry):
#! /bin/ksh
echo "Calculate average"
UserDecision=y
while test $UserDecision = y
do
echo "Enter a number: "
read Number1
echo "Enter a number: "
read Number2
echo "Do you want to enter another number?... (2 Replies)
Hi everyone,
I wrote a script that is supposed to be run by cron on a daily basis. It works just fine if I run it manually, but due to a lack of environment variables (which are available during my user session but not when cron runs the script) it keeps failing to run successfully.
Here's the... (2 Replies)
Hello... and thanks in advance for any help anyone can offer me with my question! I'm hoping someone will have a little patience with me and walk me through this!
I'm trying to understand a user login process on Centos 7 and I've gotten a bit confused trying to figure out when/how a Gnome... (4 Replies)
I have some comments about a previously closed topic whose name is the same as above
Omitted from the discussion was the situation with a "sudo command or sudo within a script".
There is an inconsistency between systems. On some systems $LOGNAME is invariant, on others,
on RedHat sudo... (3 Replies)
Discussion started by: lsatenstein
3 Replies
LEARN ABOUT PHP
getconf
GETCONF(1) Debian GNU/Linux GETCONF(1)NAME
getconf - Query system configuration variables
SYNOPSIS
getconf -a
getconf [-v specification] system_var
getconf [-v specification] path_var pathname
DESCRIPTION -a
Displays all configuration variables for the current system
and their values.
-v
Indicate the specification and version for which to obtain
configuration variables.
system_var
A system configuration variable, as defined by sysconf(3) or
confstr(3).
path_var
A system configuration variable as defined by pathconf(3). This
must be used with a pathname.
AUTHOR
getconf was written by Roland McGrath for the GNU C Library
This man page was written by Ben Collins <bcollins@debian.org> for the Debian GNU/Linux system.
SEE ALSO sysconf(3), pathconf(3), confstr(3)3rd Berkeley Distribution squeeze GETCONF(1)