This thread today reminded me of it: Larger window
This is OSX 10.13.6 and greater centric only.
This expands the terminal window on the fly in bash.
You initially need to put the standard terminal window to the top left hand side as far as it goes.
I wrote this for my 19 month old grandson, (17-06-2018), as he loves punching the computer keyboard.
It is a simple keyboard plaything that prints a coloured squared in a random position inside an expanded terminal window. The window size is for a MBP 13 inch device so that is the reason for the odd terminal size.
If the first argument is set to [Yy] then a single alpha-numeric character is spoken so little one can learn said characters as well as printing the random coloured square. If the second argument is set to [Yy] then you can write a sentance of not more than 40 characters to aid in speech learning also with the random coloured square.
If there are no arguments then just the random coloured square is generated per keystroke.
Have fun little ones.
I have been troubleshooting a mysterious performance problem with the nightly batch programs on our primary system for quite some time and just found something very interesting. All batch processes are running with a nice value of 24. I don't know what the default is on other systems but I do know... (3 Replies)
i have content that looks like this:
0003326050 A E LITHO
0023823422 AMERICAN RED CROSS
0005713642 ARUP LABORATORIES
0003206450 CAEL
0002519930 CARDINAL HEALTH
0002619063 FISHER HEALTHCAR
0065203177 OWENS & MINOR INC
0016552938 STAPLES INC
0000002001 MSC... (8 Replies)
Hi
I would like to test for a max number value. It may be a decimal so I know I have to pipe into bc.
I just cannot get the syntax for this to work. I cannot get passed an error with the bracket - see below.
Any help appreciated.
Regards
Ewan
This works:
/export/home/ewan> cat... (5 Replies)
Hello All,
I am trying to come up with a shell script to count a specific word in a logfile on each day of this month, last month and the month before. I need to produce this report and email it to customer.
Any ideas would be appreciated! (5 Replies)
Hi,
I have a script that accepts an input date from the user in yyyy-mm-dd format.
I need to get the mm-dd part and convert it to month name.
example:
2011-11-15
I want that to become "Nov 15"
I don't have the GNU date, I am using an AIX os.
Thanks. (1 Reply)
Hello,
i`m looking for some way to add to some date an partial number of months, for example to 2015y 02m 27d + 2,54m
i need to write this script in php or bash or sh or mysql or perl in normal time o unix time
i`m asking or there are any simple way to add partial number of month to some... (14 Replies)
Hi,
I need all file names in a folder which has date >= 10th of last month,
Example
: files in folder
AUTO_F1_20140610.TXT
BUTO_F1_20140616.TXT
CUTO_F1_20140603.TXT
FA_AUTO_06012014.TXT
LA_AUTO_06112014.TXT
MA_AUTO_06212014.TXT
ZA_AUTO_06232014.TXT
Output:
AUTO_F1_20140610.TXT... (9 Replies)
Dear Masters,
I need to eliminate lines from file input 2 when the date in column 1 more than date in column 1 in file input 1
input 1
20141101|USA|CANSEL|496420000
20141101|USA|CANUT|1069740000
20141101|USA|CANTENG|625920000
20141102|USA|CANUT|413180000
20141103|USA|CANSEL|1364245000... (5 Replies)
Discussion started by: radius
5 Replies
LEARN ABOUT REDHAT
urandom
RANDOM(4) Linux Programmer's Manual RANDOM(4)NAME
random, urandom - kernel random number source devices
DESCRIPTION
The character special files /dev/random and /dev/urandom (present since Linux 1.3.30) provide an interface to the kernel's random number
generator. File /dev/random has major device number 1 and minor device number 8. File /dev/urandom has major device number 1 and minor
device number 9.
The random number generator gathers environmental noise from device drivers and other sources into an entropy pool. The generator also
keeps an estimate of the number of bit of the noise in the entropy pool. From this entropy pool random numbers are created.
When read, the /dev/random device will only return random bytes within the estimated number of bits of noise in the entropy pool.
/dev/random should be suitable for uses that need very high quality randomness such as one-time pad or key generation. When the entropy
pool is empty, reads to /dev/random will block until additional environmental noise is gathered.
When read, /dev/urandom device will return as many bytes as are requested. As a result, if there is not sufficient entropy in the entropy
pool, the returned values are theoretically vulnerable to a cryptographic attack on the algorithms used by the driver. Knowledge of how to
do this is not available in the current non-classified literature, but it is theoretically possible that such an attack may exist. If this
is a concern in your application, use /dev/random instead.
CONFIGURING
If your system does not have /dev/random and /dev/urandom created already, they can be created with the following commands:
mknod -m 644 /dev/random c 1 8
mknod -m 644 /dev/urandom c 1 9
chown root:root /dev/random /dev/urandom
When a Linux system starts up without much operator interaction, the entropy pool may be in a fairly predictable state. This reduces the
actual amount of noise in the entropy pool below the estimate. In order to counteract this effect, it helps to carry entropy pool informa-
tion across shut-downs and start-ups. To do this, add the following lines to an appropriate script which is run during the Linux system
start-up sequence:
echo "Initializing kernel random number generator..."
# Initialize kernel random number generator with random seed
# from last shut-down (or start-up) to this start-up. Load and
# then save 512 bytes, which is the size of the entropy pool.
if [ -f /var/random-seed ]; then
cat /var/random-seed >/dev/urandom
fi
dd if=/dev/urandom of=/var/random-seed count=1
Also, add the following lines in an appropriate script which is run during the Linux system shutdown:
# Carry a random seed from shut-down to start-up for the random
# number generator. Save 512 bytes, which is the size of the
# random number generator's entropy pool.
echo "Saving random seed..."
dd if=/dev/urandom of=/var/random-seed count=1
FILES
/dev/random
/dev/urandom
AUTHOR
The kernel's random number generator was written by Theodore Ts'o (tytso@athena.mit.edu).
SEE ALSO
mknod (1)
RFC 1750, "Randomness Recommendations for Security"
Linux 1997-08-01 RANDOM(4)