No process to read data written to a pipe on AIX

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

How to read a fast written log file at Real time speed?

Hello All, I am building a real time parser for a log file in my application. The log file is continuously written at a very fast pace and gets rolled over every 10 minutes. I have measured the speed and observed that around 1000 lines are written to it every second, each line about 30-40...

2. Shell Programming and Scripting

Read pipe data

Hello, I need to read the pipe data as:- cat abc.txt | uuencode abc.txt | mailx -s hi xyz@xyz.com I will override the mailx function so that when mailx is called, it calls my version of maix and in that function I want to read the file which is attached in progional mailx function- abc.txt...

3. Shell Programming and Scripting

Perl: How to read text from file and process $variable in that data too.

In the hello.htm have the sentenses: Hello $name How are you? The perl script: $name = "David"; open(HEADER,"hello.htm"); while(<HEADER>) { $html .= $_; } close(HEADER); print "$html";I making something about template. But it can't process the $name variable.

4. AIX

Tape drive problem - no process to read data written to a pipe

Hi Everyone, The machine I'm working on is an AIX 5.3 LPAR running on a P650. oslevel -r shows 5300-08. I'm trying to take a backup to a SCSI tape drive, which has been working up until this point. I know of nothing that has changed recently to cause this problem. But when I try to take a...

5. Shell Programming and Scripting

Read/Search file being written to giving error due to timing issues

The following is a piece of code to rename LOG_FILE_NEW to LOG_FILE once you get a result (either RUNNING or SHUTDOWN) RESULT="" sleep 30 while ; do sleep 10 RESULT=`sed -n '/RUNNING/'p ${LOG_FILE_NEW}` if ; then RESULT=`sed -n '/SHUTTING_DOWN/'p ${LOG_FILE_NEW}` fi done mv...

6. UNIX for Dummies Questions & Answers

restrict data from getting written to Logs

$SYBASE/bin/isql -U $DB_USERID -S $DB_SERVER << ! >> $OUTFILE `echo $DB_PASSWD` use $db go Print " The processing" go ! # Extract data to file echo $DB_PASSWD | $SYBASE/bin/bcp $WRK_DB..open out $CONV_DIR/open".csv -t\, -c -U $DB_USERID -S $DB_SERVER -b 1000 | tail -3 I am able to...

7. UNIX for Advanced & Expert Users

AIX 5.3 - There is no process to read data written to a pipe

I have the following code which works on AIX 4.3 but fails at times on AIX 5.3 with: cat: 0652-054 cannot write to output. There is no process to read data written to a pipe. validator="${validator_exe} ${validator_parms}" cmd_line="${CAT} ${data_file} | ${validator}...

8. Shell Programming and Scripting

Perform action file name written to the pipe

Hello, I have a script that monitors files uploaded via ftp. After a successful upload, the file name is written to the pipe. There is another program that reads this pipe and allows automatically run any program or script ( say test.sh ) to process the newly uploaded file. cat test.sh...

9. Programming

How to clear the content of a pipe (STDIN) after it is written to another program?

PROGRAM A <-> PROGRAM B PROGRAM A sends data as STDIN ro PROGRAM B and when PROGRAM B is executed from PROGRAM A, it sends output back to PROGRAM A. This is implemented using 2 pipes (fd1 & fd2). The above process happens in a loop and during the second run, the previous data that had been...

10. Linux

check written data

I'm using growisofs to write DVD, e.g. $ growisofs -Z /dev/dvd -V "Personal Data, `date +"%b, %d %Y"`" -R -J /mnt/d/* How can I test whether data was written correctly? md5sum or so?

LEARN ABOUT DEBIAN

bup-margin

bup-margin(1)						      General Commands Manual						     bup-margin(1)

NAME

       bup-margin - figure out your deduplication safety margin

SYNOPSIS

       bup margin [options...]

DESCRIPTION

       bup margin  iterates  through  all  objects  in	your  bup repository, calculating the largest number of prefix bits shared between any two
       entries.  This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.

       For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45.  That  means  a  46-bit
       hash  would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
       its first 46 bits.

       The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects.  Since SHA-1 hashes have 160 bits,
       that  leaves 115 bits of margin.  Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
       with far fewer objects.

       If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see	if
       you're getting dangerously close to 160 bits.

OPTIONS

       --predict
	      Guess  the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
	      from the guess.  This is potentially useful for tuning an interpolation search algorithm.

       --ignore-midx
	      don't use .midx files, use only .idx files.  This is only really useful when used with --predict.

EXAMPLE

	      $ bup margin
	      Reading indexes: 100.00% (1612581/1612581), done.
	      40
	      40 matching prefix bits
	      1.94 bits per doubling
	      120 bits (61.86 doublings) remaining
	      4.19338e+18 times larger is possible

	      Everyone on earth could have 625878182 data sets
	      like yours, all in one repository, and we would
	      expect 1 object collision.

	      $ bup margin --predict
	      PackIdxList: using 1 index.
	      Reading indexes: 100.00% (1612581/1612581), done.
	      915 of 1612581 (0.057%)

SEE ALSO

       bup-midx(1), bup-save(1)

BUP

       Part of the bup(1) suite.

AUTHORS

       Avery Pennarun <apenwarr@gmail.com>.

Bup unknown-															     bup-margin(1)

UNIX for Dummies Questions & Answers