You can first set the bash mode to vi. This will enable some vim like features to bash. So, add this to .bashrc :
set -o vi
Once, you have done that then its time to get more out of the vi mode. First, check some things and set some interesting stuff.
Continue readingHere is script that checks all the colorschemes in the current directory and corrects them if possible (Processing of the file is done with simple commands like sed, grep)
Checks that the color_name is same as Filename
Here is the script:
#!/bin/bash -
#===============================================================================
#
# FILE: check_colors.sh
#
# USAGE: ./check_colors.sh
#
# DESCRIPTION:
#
# OPTIONS: ---
# REQUIREMENTS: ---
# BUGS: ---
# NOTES: ---
# AUTHOR: Amit Agarwal (aka),
# REVISION: ---
#===============================================================================
cd ~/.vim/colors
for i in *vim
do
#echo "Processing $i"
if [[ $(grep -c g:colors_name $i ) -eq 0 ]]; then
if [[ $(grep -c colors_name $i ) -eq 0 ]]; then
echo "File $i does not have colorname";
missing=$missing" $i"
else
sed -i.bak '/colors_name/ s/.*/let g:colors_name="'${i//.vim}'"/g' $i
fi
else
if [[ $(grep -c colors_name $i|grep let ) -gt 1 ]]; then
echo "WARN ----->> File $i has more than one colorsname"
fi
colorname=$(grep g:colors_name $i|grep let| sed -e 's/"//g' -e 's/.*=//' |tr -d ' ')
if [[ ${colorname}.vim != $i ]]; then
echo "Filename $i does not match colorname $colorname .. correcting "
sed -i.bak '/colors_name/ s/.*/let g:colors_name="'${i//.vim}'"/g' $i
#sed -i.bak 's/(.*g:colors_name.*=)/1'${i//.vim}'/g' $i
fi
fi
done
if [[ x$missing != x ]] ; then
echo "Missing colornames in $missing"
fi
Continue reading
Some time back I posted on dnsmasq starting from Network Manager and how to setup dnsmasq.
Now, couple of days back , I setup dnsmasq in NetworkManager but was astonished to see that there was no dnsmasq running. I checked with dig and saw that there was no response from localhost for dns queries. Checked “ps -eaf|grep dns” and found that there was no dnsmasq running. I knew that once you mention “dns=dnsmasq” in the NetworkManager then it should start up but that was not happening. And then I checked audit log, found that some permissions were denied by SELinux.
Continue readingIf you have a lot of CPU power and working on battery. If you do not need that much of power and would like to rather save some battery power by disabling some cpus then you can use the below script. This script disables cpus from 4 to 7. You can change the number in the for loop. You would need the sudo to be setup or remove sudo and run the script as root. The script will show you the currently active cpu’s before and after disabling the CPU’s.
Continue readingToday we will look at some bash code snippests and the performance issues. Lets first look at the problem and the implemented solution:
Problem: We needed to log the output of the ps command for all the process’s. This was required to be done on per minute basis and the output was required in comma separated files. So, here is what was implemented:
pslog=`ps -e -opid,ppid,user,nlwp,pmem,vsz,rss,s,time,stime,pri,nice,pcp:u,args|grep -v PID|sort -r -k 13,13`
OLD_IFS=$IFS
IFS=$'\n'
logarr=( $pslog )
for LOGLINE in ${logarr[@]}
do
LOGLINE=`echo $LOGLINE|awk '{OFS=",";print $1,$2,$3,$4,$5,$6,$7,:$8,$9,$10,$11,$12,$13,$14}'`
echo $LOGLINE >> output
done
IFS=$OLD_IFS
This was working well and there were no issues. But suddenly we started seeing issues with the reported CPU usages. We would see that whenever this script was running the CPU usage was high, specially if there were too many process’s/thread’s on the system during that time. This code was definitely part of a very large code base, and at this point of time we did not know what was causing the issues.
Continue readingIf you work regularly on a Solaris or systems which do not have the “-r” (recursive grep) for grep, then you know what a lifesaver this command can be.
Here is one from command line fu:
find . -type f -exec awk '/linux/ { printf "%s %s: %s\n", FILENAME, NR, $0; }' {} \;
The benefit of using awk here is that you can print the line number also 🙂
Continue readingHere is one of the scripts that I found on the net while searching for something … Note the URL for the script in the Description.
#!/bin/bash - #=============================================================================== # # FILE: linux_hw.sh # # USAGE: ./linux_hw.sh # # DESCRIPTION: http://www.howtogeek.com/howto/solaris/get-the-processor-type-on-solaris/ # # OPTIONS: --- # REQUIREMENTS: --- # BUGS: --- # NOTES: --- # AUTHOR: Amit Agarwal (aka), amit.agarwal@roamware.com # COMPANY: Roamware India Pvt Ltd # CREATED: 09/13/2011 03:57:34 PM IST # Last modified: Sun Oct 30, 2011 04:59PM # REVISION: --- #=============================================================================== function linux_hw_CPU { typeset num=0 typeset name="" typeset cores="" name="$( cat /proc/cpuinfo | awk -F: ' /vendor_id/ { vendor=$2 } /model name/ { model=$2 } /cpu MHz/ { if( model ~ "Hz" ) {speed=""} else { speed=$2? MHz" }; print vendor, model, speed; } ' | tail -1 )" num=$(if [ -r /proc/vmware/cpuinfo ]; then awk '/pcpu/ { print NF-1 }' /proc/vmware/cpuinfo; else cat /proc/cpuinfo | grep processor| wc -l; fi) # ESX: mas info sobre logical/cores/packages if [ -r /proc/vmware/sched/ncpus ] then cores=$( echo $( cat /proc/vmware/sched/ncpus ) ) fi echo $num $( echo "$name ($cores)" | enclose ) } function enclose { tr -s " " | sed -e "s/^/\"/; s/$/\"/; s/\"\ /\"/; s/\ \"/\"/" } function linux_hw_CPU { typeset num=0 typeset name="" typeset cores="" name="$( cat /proc/cpuinfo | awk -F: ' /vendor_id/ { vendor=$2 } /model name/ { model=$2 } /cpu MHz/ { if( model ~ "Hz" ) {speed=""} else { speed=$2" MHz" }; print vendor, model, speed; } ' | tail -1 )" num=$( if [ -r /proc/vmware/cpuinfo ] then awk '/pcpu/ { print NF-1 }' /proc/vmware/cpuinfo else cat /proc/cpuinfo | grep processor| wc -l fi ) if grep -q "physical id" /proc/cpuinfo || grep "siblings" /proc/cpuinfo then chip_count=$( grep "physical id" /proc/cpuinfo | sort -u | wc -l ) chip_core=$( grep "siblings" /proc/cpuinfo | tail -1 | cut -d: -f2 ) cores="($chip_count chips x $chip_core cores)" fi # Blades HP con if [ -x /sbin/hpasmcli ] then chip_name=$( /sbin/hpasmcli -s "SHOW SERVER" | grep "Name" | head -1 | cut -d: -f2 ) chip_speed=$( /sbin/hpasmcli -s "SHOW SERVER" | grep "Speed" | head -1 | cut -d: -f2 ) chip_core=$( /sbin/hpasmcli -s "SHOW SERVER" | grep "Core" | head -1 | cut -d: -f2 ) fi # ESX: mas info sobre logical/cores/packages if [ -r /proc/vmware/sched/ncpus ] then cores="($( echo $( cat /proc/vmware/sched/ncpus ) ))" fi # Linux Itanium IA64 if grep -q -i itanium /proc/cpuinfo then name="$( grep "vendor" /proc/cpuinfo | cut -d: -f2- | tail -1 ) $( grep "arch " /proc/cpuinfo | cut -d: -f2- | tail -1 ) $( grep "family" /proc/cpuinfo | cut -d: -f2- | tail -1 ) $( grep "cpu MHz" /proc/cpuinfo | cut -d: -f2- | cut -d. -f1 | tail -1 ) Mhz" chip_count=$( grep "physical id" /proc/cpuinfo | sort -u | wc -l ) chip_core=$( grep "siblings" /proc/cpuinfo | tail -1 | cut -d: -f2 ) cores="($chip_count chips x $chip_core cores)" fi echo $num $( echo "$name $cores" | enclose ) } linux_hw_CPU
