Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Which cut command is more efficient?
Top Forums UNIX for Advanced & Expert Users Which cut command is more efficient? Post 302508316 by methyl on Sunday 27th of March 2011 09:00:38 PM
Old 03-27-2011
Quote:
In my early shell-scripting days I wrote scripts that I'm sure would need your 36 processors to function with any efficiency Having CPU power to waste hardly makes it a good idea to do so.
My stats do not show waste of CPU power. They show a CPU power saving by using "cat" because "cut" is less efficient at reading files. However in a single stream environment loading multiple processes in a long pipeline would have been a performance disaster.

In my early days or unix I have dealt with system crashes caused by for example: too many concurrent processes; too many forks; disc buffer overload; mysterious kernel crash etc. . It's hard to even generate these situations on modern systems after an initial large-scale kernel build.


There is a very good O'Reilly book "System Performance Tuning" but do bear in mind that it does not cover very large unix systems adequately.
 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

cut command

how do you show just the used disk space. using the cut and df command?? or does anyone have any other suggestions on how to do it a better way? (3 Replies)
Discussion started by: rookie22
3 Replies

2. Shell Programming and Scripting

Cut command

Hi, I want to cut from a particular position to a particular position and retain the rest. I tried this cut -c31-51 file1.txt > file2.txt But The characters from the position 31 to 51 were only present in file2.txt. Is there a way to reverse this i.e to retain the rest except from... (1 Reply)
Discussion started by: ragavhere
1 Replies

3. Shell Programming and Scripting

Help with cut command

Gurus, I need help with the cut command : I have a file with garbage charaters at the beginning of each record; but these characters are not of the same length; First record has 3 garbage chars to be removed; rest have 2; If the length was consistent across all the records, I could have... (3 Replies)
Discussion started by: tru_tell
3 Replies

4. Shell Programming and Scripting

Cut Command error cut: Bad range

Hi Can anyone what I am doing wrong while using cut command. for f in *.log do logfilename=$f Log "Log file Name: $logfilename" logfile1=`basename $logfilename .log` flength=${#logfile1} Log "file length $flength" from_length=$(($flength - 15)) Log "from... (2 Replies)
Discussion started by: dgmm
2 Replies

5. UNIX for Dummies Questions & Answers

Cut pid from ps using cut command

hay i am trying to get JUST the PID from the ps command. my command line is: ps -ef | grep "mintty" | cut -d' ' -f2 but i get an empty line. i assume that the delimiter is not just one space character, but can't figure out what should i do in order to do that. i know i can use awk or cut... (8 Replies)
Discussion started by: ran ber
8 Replies

6. Shell Programming and Scripting

Cut command

hi, i have a file abc,"an,ab",cde,efg abc,anab,cde,efg and need to cut the second field so the output should be abc,cde,efg and i have used cut -d',' -f1-1,3- but its giving me abc,ab",cde,efg abc,cde,efg (4 Replies)
Discussion started by: ATWC
4 Replies

7. UNIX for Beginners Questions & Answers

Cut command: can't make it cut fields

I'm a complete beginner in UNIX (and not a computer science student either), just undergoing a tutoring course. Trying to replicate the instructions on my own I directed output of the ls listing command (lists all files of my home directory ) to My_dir.tsv file (see the screenshot) to make use of... (9 Replies)
Discussion started by: scrutinizerix
9 Replies

8. Shell Programming and Scripting

Combining awk command to make it more efficient

VARIABLE="jhovan 5259 5241 0 20:11 ? 00:00:00 /proc/self/exe --type=gpu-process --channel=5182.0.1597089149 --supports-dual-gpus=false --gpu-driver-bug-workarounds=2,45,57 --disable-accelerated-video-decode --gpu-vendor-id=0x80ee --gpu-device-id=0xbeef --gpu-driver-vendor... (3 Replies)
Discussion started by: SkySmart
3 Replies

9. Shell Programming and Scripting

Efficient way to combine command

im currently running the following command to grab all arguments in front of a script, directly from the process table. # cat /tmp/allmyprocs ubuntu 9933 27793 0 03:29 pts/0 00:00:00 /bin/sh ./prying.sh ubuntu 9941 9933 0 03:29 pts/0 00:00:00 sh ubuntu 9952 9941 0 03:29... (1 Reply)
Discussion started by: SkySmart
1 Replies

LEARN ABOUT OPENSOLARIS

gnome-power-manager

gnome-power-manager(1)						   User Commands					    gnome-power-manager(1)

NAME

       gnome-power-manager - GNOME power manager session daemon

SYNOPSIS

       gnome-power-manager [--help] [--verbose] [--no-daemon] [--debug]

DESCRIPTION

       gnome-power-manager  is	the  backend  program of the GNOME power management infrastructure providing a complete and integrated solution to
       power management under the GNOME desktop environment.

       It supports features such as suspending, hibernating, screen blanking, CPU frequency switching, and more in one small neat package.

OPTIONS

       This program follows the usual  command line syntax, with long options starting with two dashes (`-').  A summary of  options  is  included
       below.

       --help	       Show summary of options.

       --verbose       Show extra debugging.

       --no-daemon     Do not detach gnome-power-manager into the background so that error messages will be displayed on console.

       --debug	       Only show specific debugging options. Useful for developers only.

EXAMPLES

       Example 1: Launching gnome-power-manager with displaying extra debugging messages on console.

       example% gnome-power-manager --no-daemon --verbose

EXIT STATUS

       The following exit values are returned:

       0	Application exited successfully

       >0	Application exited with failure

FILES

       The following files are used by this application:

       /usr/bin/gnome-power-manager

	   Executable for gnome power manager session daemon

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-power-manager	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Volatile			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gnome-power-preferences(1), gnome-power-statistics(1), attributes(5)

NOTES

       This manual page was written by Oliver Grawert ogra@ubuntu.com for the Debian system and updated by Ow Mun Heng nikeow@yahoo.com

       Updated by Simon Zheng, Sun Microsystems Inc., 2008.

SunOS 5.11							    18 Feb 2008 					    gnome-power-manager(1)
All times are GMT -4. The time now is 05:53 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy