I keep getting an error at line 21, it doesn't like my if statement. Previously I have tried using (( )), but still get errors. The current error is that server_busy is not found. This is the script:
#! /bin/ksh
server_busy="na"
for file in $1 $2 $3 $4 $5 $6
do
echo " ${file}\t\c"
... (1 Reply)
I need an IF statement that will compare the contents of the variable CX with the actual string "CP". ie. If the contents of $CX are NOT equal to the actual string "CP" then blah blah blah.
I have tried a number of things including the following.......
if ]; then
if ]; then
if ];... (2 Replies)
hi all. i just have a very small problem. i have a menu of 7 choices. i want an if statement so that if the user chooses anything except inside the 1 to 7 range, i can handle the error for it.
i tried this:
if ]
then
.......
fi
(but it dont work)
...any suggestions?
... (4 Replies)
The problem I am having here is that only the 1st option is executed, no matter if I pick yes or no. What am I doing wrong? How can I get this working right without resorting to a case statement?
echo "This is the max size your lvol can be:"
echo $MAXSIZE
echo
echo Do you want to max out... (2 Replies)
Hi I have a bash script like this
if
then
echo "A"
else
echo "B"
fi
$1 is something like 02350 (there is always a trailing '0')
and I would like to have an if based on the value of the digits after the 0.
Can anybody help?
Thanks,
Sarah (3 Replies)
Could someone help me out with this if statement? It's supposed to get a person's website, but it isn't working when I run it.
website=""
echo "Would you like to enter a website? Enter Yes/No"
read choice
if
then
while
do
echo "Please enter a website:";
read... (4 Replies)
Writing my script and I'm banging my head on the desk right now ...
My biggest problem is the 3rd IF statement where I check if the username exists. Doing the grep command on it's own in the shell gives me a 1 or 0 value. Running the script, it always returns a false value (runs the ELSE... (4 Replies)
echo "Enter the variable: " "
read var1
echo " "
for i in ib eb atm
do
if ; then
mv properties environment.properties
break
else
echo "No changes to $var1 "
fi
done
When i run and enter the eb it's not working.Any suggestions please.. (7 Replies)
Hi All,
I am writing an if statement to check multiple conditions, but when I try to execute the script it is breaking at the point of if statement by showing the issue below.
Code I am using is given below.
if -a ]
then
....
else
...
fi
I am not understanding... (3 Replies)
Discussion started by: ginrkf
3 Replies
LEARN ABOUT OPENDARWIN
random
RANDOM(4) BSD Kernel Interfaces Manual RANDOM(4)NAME
random , urandom -- random data source devices.
SYNOPSIS
pseudo-device random
DESCRIPTION
The random device produces uniformly distributed random byte values of potentially high quality.
To obtain random bytes, open /dev/random for reading and read from it.
To add entropy to the random generation system, open /dev/random for writing and write data that you believe to be somehow random.
/dev/urandom is a compatibility nod to Linux. On Linux, /dev/urandom will produce lower quality output if the entropy pool drains, while
/dev/random will prefer to block and wait for additional entropy to be collected. With Yarrow, this choice and distinction is not necessary,
and the two devices behave identically. You may use either.
OPERATION
The random device implements the Yarrow pseudo random number generator algorithm and maintains its entropy pool. Addditional entropy is fed
to the generator regularly by the SecurityServer daemon from random jitter measurements of the kernel. SecurityServer is also responsible
for periodically saving some entropy to disk and reloading it during startup to provide entropy in early system operation.
You may feed additional entropy to the generator by writing it to the random device, though this is not required in a normal operating envi-
ronment.
LIMITATIONS AND WARNINGS
Yarrow is a fairly resilient algorithm, and is believed to be resistant to non-root. The quality of its output is however dependent on regu-
lar addition of appropriate entropy. If the SecurityServer system daemon fails for any reason, output quality will suffer over time without
any explicit indication from the random device itself.
Paranoid programmers can counter-act this risk somewhat by collecting entropy of their choice (e.g. from keystroke or mouse timings) and
seeding it into random directly before obtaining important random numbers.
FILES
/dev/random
/dev/urandom
HISTORY
A random device appeared in Linux operating system.
Darwin September 6, 2001 Darwin