Failure using regex with awk in 'while read file' loop Post: 302940579

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Read from a file and use the strings in a loop

Hello all, I need some help to create a script which contain a few strings on every line, and use those strings in a loop to fire some commands. for exmaple the file looks like tom dave bill andy paul I want to read one line at a time and use it in loop like command tom command dave...

2. UNIX for Dummies Questions & Answers

How to read a file in unix using do....done loop

Hi , can some give me idea about how to use do...done while loop in UNIX to read the contents of a file..

3. Shell Programming and Scripting

How to Read the entire file using while loop

Guys, I am trying to read the whole file using while loop but when i run the ssh part of the script it reads only the first line and exit after that. There are in total 134 lines in the file, but when the output is redirected, it does only for one line and comes to command prompt. pls help.....

4. SCO

file system not getting mounted in read write mode after system power failure

After System power get failed File system is not getting mounted in read- write mode

5. Shell Programming and Scripting

IF awk in a while read line-loop

Hi As a newbe in scripting, i struggle hard with my first script. What i want to do is, bringing data of two files together. file1: .... 05/14/12-04:00:00 41253 4259 5135 5604 5812 5372 05/14/12-04:10:00 53408 5501 6592 7402 7354 6639 05/14/12-04:20:00 58748 6037 7292 8223...

6. UNIX for Dummies Questions & Answers

read regex from ID file, print regex and line below from source file

I have a file of protein sequences with headers (my source file). Based on a list of IDs (which are included in some of the headers), I'd like to print out only the specified sequences, with only the ID as header. In other words, I'd like to search source.txt for the terms in IDs.txt, and print...

7. Shell Programming and Scripting

Using awk instead of while loop to read file

Hello, I have a huge file, I am currently using while loop to read and do some calculation on it, but it is taking a lot of time. I want to use AWK to read and do those calculations. Please suggest. currently doing: cat input2 | while read var1 do num=`echo $var1 | awk...

8. Shell Programming and Scripting

For loop inside awk to read and print contents of files

Hello, I have a set of files Xfile0001 - Xfile0021, and the content of this files (one at a time) needs to be printed between some line (lines start with word "Generated") that I am extracting from another file called file7.txt and all the output goes into output.txt. First I tried creating a for...

9. Shell Programming and Scripting

Use while loop to read file and use ${file} for both filename input into awk and as string to print

I have files named with different prefixes. From each I want to extract the first line containing a specific string, and then print that line along with the prefix. I've tried to do this with a while loop, but instead of printing the prefix I print the first line of the file twice. Files:...

10. Shell Programming and Scripting

Failure: if grep "$Var" "$line" inside while read line loop

Hi everybody, I am new at Unix/Bourne shell scripting and with my youngest experiences, I will not become very old with it :o My code: #!/bin/sh set -e set -u export IFS= optl="Optl" LOCSTORCLI="/opt/lsi/storcli/storcli" ($LOCSTORCLI /c0 /vall show | grep RAID | cut -d " "...

LEARN ABOUT OPENDARWIN

urandom

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