Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Piping through grep/awk prevents file write
Top Forums Shell Programming and Scripting Piping through grep/awk prevents file write Post 302893935 by treesloth on Saturday 22nd of March 2014 02:05:01 AM
Old 03-22-2014
Piping through grep/awk prevents file write
So, this is weird... I'm running this command:

Code:
iotop -o -P -k -bt -d 5

I'd like to save the output relelvant to rsyslogd to a file, so I do this:

Code:
iotop -o -P -k -bt -d 5 | grep rsyslogd >> /var/log/rsyslogd

Nothing is written to the file! I can write the full output to the file:

Code:
iotop -o -P -k -bt -d 5 >> /var/log/rsyslogd

But I can't pipe the output through grep and then write to a file! How odd. I've also tried awk in place of grep. Any idea what might be causing this? Thanks.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Piping GREP

Hi, I need to use a double grep so to speak. I need to grep for a particular item say BOB and then for each successful result I need to grep for another item say SMITH. I tried grep "BOB" filename | grep "SMITH" but it does not seem to work. I can achieve my desired result using an... (12 Replies)
Discussion started by: mojoman
12 Replies

2. Shell Programming and Scripting

Piping tail to awk to parse a log file

Hello all, I've got what I'm pretty sure is a simple problem, but I just can't seem to work past it. I'm trying to use awk to pretty up a log file, and calculate a percentage. The log file looks like this: # tail strtovrUsage 20090531-18:15:45 RSreq - 24, RSsuc - 24, RSrun - 78, RSerr -... (4 Replies)
Discussion started by: DeCoTwc
4 Replies

3. Shell Programming and Scripting

grep a pattern and replace a value in it and write to the same file.

I have some complication with this, I have a file like below for DEV_1 till DEV_10. and the db values are set accordinly which are not unique. For example DEV1,DEV4,DEV6 can have the same target DB name. I waned to identify for DEV_2 and then replace the TARGET_DATABASE value with the new DB... (6 Replies)
Discussion started by: yesmani
6 Replies

4. Shell Programming and Scripting

awk & grep - check for a value and write sub-word

Hi people, I have a file status.txt: Following 6 ports are totally or partially unavailable: ------------------------------------------------------------ MOD LINK PORTNAMES STAT1 STAT2 STAT3 SYN TYPE ------------------------------------------------------------ 8 Pr37 ... (12 Replies)
Discussion started by: gc_sw
12 Replies

5. UNIX for Dummies Questions & Answers

Write to file using tail -f through a pipe to grep

Hi -- I'm looking to write to a file after piping output from tail -f through to grep: #write to a file for all lines with "searchtext" within in error_log: Expand|Select|Wrap|Line Numbers tail -f /var/error_log | grep searchtext > output.txt The above command... (2 Replies)
Discussion started by: ndedhia1
2 Replies

6. Ubuntu

Piping with grep

Hi everybody, I have a big file with blast results (if you know what this means, otherwise look at it just as a text file with a specific form). I am trying to extract some ids from within this file, which have certain parameters. For example, some Of my IDs have the term 'No hit results'... (1 Reply)
Discussion started by: frymor
1 Replies

7. Ubuntu

Piping with grep

Hi everybody, I have a big file with blast results (if you know what this means, otherwise look at it just as a text file with a specific form). I am trying to extract some ids from within this file, which have certain parameters. For example, some Of my IDs have the term 'No hit results'... (6 Replies)
Discussion started by: frymor
6 Replies

8. Shell Programming and Scripting

piping from grep to awk without intermediate files

I am trying to extract the file names alone, for example "TVLI_STATS_NRT_XLSTWS03_20120215_132629.csv", from below output which was given by the grep. sam:/data/log: grep "C10_Subscribe.000|subscribe|newfile|" PDEWG511_TVLI_JOB_STATS.ksh.201202* Output: ... (6 Replies)
Discussion started by: siteregsam
6 Replies

9. UNIX for Dummies Questions & Answers

Piping grep into awk, read the next line using grep

Hi, I have a number of files containing the information below. """"" Fundallinfo 6.3950 14.9715 14.0482 """"" I would like to grep for Fundallinfo and use it to read the next line? I ideally would like to read the three numbers that follow in the next line and... (2 Replies)
Discussion started by: Paul Moghadam
2 Replies

10. OS X (Apple)

Piping to grep with pbpaste

cat file 1 aaa 2 bbb 3 ccc 4 ddd In TextEdit, I then copy the characters “ccc” to the clipboard. The problem is that the following command gives no output: bash-3.2$ pbpaste | grep - file Desired output: 3 ccc What should the syntax be for that command? I am using MacOS El... (3 Replies)
Discussion started by: palex
3 Replies

LEARN ABOUT V7

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
All times are GMT -4. The time now is 06:25 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy