Tag: linux

acct for process accounting

ABOUT process accounting Process accounting is a security method in which an administrator may keep track of system resources used and their allocation among users, provide for system monitoring, and minimally track a user’s commands. Process accounting has both positive and negative points. SPECIFIC EXPLANATION [text] acct: highwater lowwater frequency If BSD-style process accounting is […]

August 31, 2020
watch – execute a program periodically

commandline session following commandline session may not be accurate. $vmstat procs ———–memory———- —swap– —–io—- -system– —-cpu—- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 0 2246368 32720 497284 0 0 217 10 236 436 3 1 92 3 $watch vmstat $watch -n 0.5 vmstat $watch […]

November 8, 2013
GNU/Linux Commands for Beginners : alias

this tutorial content may not be accurate

October 30, 2013
GNU/Linux Terminal – File Permissions! (Chmod, Chown and Chgrp)

this tutorial content may not be accurate

October 24, 2013
How To Apply a Patch To The Linux Kernel Stable Tree

October 10, 2013
How Linux is Built

October 8, 2013
file — determine file type

commandline session $ls faq favicon.ico index.html kernel.css mirrors pub robots.txt $file kernel.css kernel.css: ASCII text $file -l | head Set 0: Binary patterns: Text patterns: Set 1: Binary patterns: Text patterns: Set 0: Binary patterns: Strength = 340 : sc68 Atari ST music [] Strength = 340 : T64 tape Image [] $file -l | […]

September 2, 2013
readelf – Displays information about ELF files

commandline session $readelf -I /bin/ping Histogram for `.gnu.hash’ bucket list length (total of 3 buckets): Length Number % of total Coverage 0 0 ( 0.0%) 1 0 ( 0.0%) 0.0% 2 0 ( 0.0%) 0.0% 3 3 (100.0%) 100.0% $readelf -a /bin/ping | head ELF Header: Magic: 7f 45 4c 46 02 01 01 00 […]

August 27, 2013
linux 0.01 boot.s (copy from linux 0.01)

boot.s is loaded at 0x7c00 by the bios startup routines and moves itself out of the way to address 0x90000, and jumps there.It then loads the system at 0x10000, using BIOS interrupts. Thereafter it disables all interrupts,moves the system down to 0x0000 , changes to protected mode and calls the start of system. The system […]

August 16, 2011
chrt – manipulate real-time attributes of a process

A UNIX Command $chrt -m SCHED_OTHER min/max priority : 0/0 SCHED_FIFO min/max priority : 1/99 SCHED_RR min/max priority : 1/99 SCHED_BATCH min/max priority : 0/0 SCHED_IDLE min/max priority : 0/0 $chrt -b -p 0 4555 $chrt -p 4555 pid 4555’s current scheduling policy: SCHED_BATCH pid 4555’s current scheduling priority: 0 $chrt -o -p 0 4555 […]

August 7, 2011