I do remember you being quite concerned with performance in this SWARM stuff and I would have thought the bash =~ operator could be use in place of grep.
Twice as fast on my system, but your mileage may vary
This User Gave Thanks to Chubler_XL For This Post:
We have requirments to not allow a userid login abilities but allow users to 'su' to it. In solaris I normally set the shell in /etc/passwd to bin/false. THis does not work on Linux, any suggestions would help. (1 Reply)
i want to delete every newline and every line which starts with "RECORD......." in a file.
FILE:
Record 61391 in base BROCKHAUS (Timestamp: 2008-04-09 11:38:38)
UNTERTITEL :
Gräfin (seit 1707 Reichsgräfin) von, * Schwerin 4. 2. 1686, + Berlin
21. 10. 1744; wurde
Record 61392 in base BROCKHAUS... (4 Replies)
Hi,
I'm new to UNIX and am trying to learn shell scripting in order to work on an interface that I inherited when a co-worker left. I need to be able to check to see whether a file exists to determine whether the FTP has taken place, but in testing, the if statement always evaluates as false,... (3 Replies)
Hi All,
I am using the below Script to enter a line in the File:
#!/bin/ksh
# To delete the last line if it contains the pattern Redirect permanent / Virgin Atlantic Airways - Popup
echo "Enter the URL that should point to the particular microsite"
read url
# To delete the last line if it... (0 Replies)
Why this happens?
How to solve this?
$netstat -na |grep 9325
tcp 0 0 127.0.0.1:9325 127.0.0.1:9325 ESTABLISHED
When a client socket repeatedly tries to connect to an inactive(no server socket is listening on this port) local port,connect succeeds.
... (1 Reply)
Checking configuration access files for an AIX server, left me wondering about this :confused::
If a user is added to system group, it gets gid=0 with some security risks because it gets some root kind of file access level.
Is this insecure condition kept if the user has admin variable... (0 Replies)
I have read the below from the book bash cookbook.Tail +1 filenames is similar to cat filename
I have tried the same in Ubuntu 11.10 with bash. 4.0 .
I have received error for the Same.
May I know in which system that will work fine ?
Thanks (1 Reply)
Hi
I have written a script to send email alerts when load of my linux server reaches max point
I keep getting false emails thought the load is normal , looks like same email is generated again and again - called from cron tab
checked if the tempfile is present , no it is not , cleaned... (22 Replies)
Discussion started by: anil529
22 Replies
LEARN ABOUT DEBIAN
bup-random
bup-random(1) General Commands Manual bup-random(1)NAME
bup-random - generate a stream of random output
SYNOPSIS
bup random [-S seed] [-fv]
DESCRIPTION
bup random produces a stream of pseudorandom output bytes to stdout. Note: the bytes are not generated using a cryptographic algorithm and
should never be used for security.
Note that the stream of random bytes will be identical every time bup random is run, unless you provide a different seed value. This is
intentional: the purpose of this program is to be able to run repeatable tests on large amounts of data, so we want identical data every
time.
bup random generates about 240 megabytes per second on a modern test system (Intel Core2), which is faster than you could achieve by read-
ing data from most disks. Thus, it can be helpful when running microbenchmarks.
OPTIONS
the number of bytes of data to generate.
Can be used with the suffices k, M, or G to indicate kilobytes, megabytes, or gigabytes, respectively.
-S, --seed=seed
use the given value to seed the pseudorandom number generator. The generated output stream will be identical for every stream
seeded with the same value. The default seed is 1. A seed value of 0 is equivalent to 1.
-f, --force
generate output even if stdout is a tty. (Generating random data to a tty is generally considered ill-advised, but you can do if
you really want.)
-v, --verbose
print a progress message showing the number of bytes that has been output so far.
EXAMPLES
$ bup random 1k | sha1sum
2108c55d0a2687c8dacf9192677c58437a55db71 -
$ bup random -S1 1k | sha1sum
2108c55d0a2687c8dacf9192677c58437a55db71 -
$ bup random -S2 1k | sha1sum
f71acb90e135d98dad7efc136e8d2cc30573e71a -
$ time bup random 1G >/dev/null
Random: 1024 Mbytes, done.
real 0m4.261s
user 0m4.048s
sys 0m0.172s
$ bup random 1G | bup split -t --bench
Random: 1024 Mbytes, done.
bup: 1048576.00kbytes in 18.59 secs = 56417.78 kbytes/sec
1092599b9c7b2909652ef1e6edac0796bfbfc573
BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-random(1)