top
1 -> CUP utilisation
> -> order by memory
check for CPU Performance
Optimized waiting%
(press '1' to see all the CPUs)
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I/O - check for %util
iostat -kx 1 1000
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Memory
free -m
free -m | grep "buffers/cache" | awk '{print $3}'
atop utility
$ echo "\"That's impossible"'!'"\" he said." "That's impossible!" he said.
You need to put the symbol between double and single quotes:
” ‘ <symbol> ‘ “
Source: http://qntm.org/bash
This can be achieved using the command nohup
nohup <command> <args> ><filename> 2>&1 & e.g. nohup /usr/bin/terminator -m -T 'main_terminal' -l My_Layout > /dev/null 2>&1 &
>> Exclude .txt files [! CASE SENSITIVE] $ rsync -avz --exclude '*.txt' source/ destination/ >> Exclude from file list $cat exclude-list.txt *.JPG *.TMP *.PDF *.jpg *.tmp *.pdf *.zip relative/path1/ relative/path2/ $ rsync -avz --exclude-from 'exclude-list.txt' /source/path/ /dest/path/ | tee rsync-report.txt >> Exclude directory $ rsync -avz --exclude 'folder1_within_source' --exclude 'folder2_within_source/subfolder2' source/ destination/
This shows loads of information like Sysinfo in Windows
dmidecode -t system dmidecode -t memory dmidecode -t memory | grep "Maximum Capacity"
grep -Fxv -f first-file.txt second-file.txt
Basically looks for all lines in second-file.txt which don’t match any line in first-file.txt. Might be slow if the files are large.
sum=0 ; for i in `cat list.txt` ; do do sum=`expr $sum + $i`; done ; echo $sum
echo exit | telnet $IP $PORT
# Install recap
git clone https://github.com/rackerlabs/recap.git
cd recap
./recap-installer
# If there is no MySQL or it can;t connect to it edit:
/etc/recap
USEMYSQL=no
USEMYSQLPROCESSLIST=no
Edit cron if you want to run often than 10 minutes:
/etc/cron.d/recap
=================================================
LOG ANALYSIS SCRIPTS
>> Check for memory usage
grep "buffers/cache" /var/log/recap/resources_* | sed 's/^.*resources_\(.*\)\.log.*cache:\s*\([0-9]*\)\s*\([0-9]*\)$/FREE: \3| USED: \2| DATE: \1/ '
>> Running the following to check if the memory went less than 4999MB
grep "buffers/cache" /var/log/recap/resources_* | sed 's/^.*resources_\(.*\)\.log.*cache:\s*\([0-9]*\)\s*\([0-9]*\)$/FREE: \3| USED: \2| DATE: \1/ ' | egrep -v "FREE: [65][0-9]{3}\|" | wc -l
# For cron/crontab
*/5 * * * * /path/myscript.sh > /dev/null 2>&1
==================================================
# Redirect ALL output/error automatically to a file
# AND print to console too
LOG_OUTPUT=output_error.log
exec 1> >(tee -i ${LOG_OUTPUT}) 2>&1
==================================================
# *ALL* redirected to the log files: NO console output at all
LOG_OUTPUT=output.log
exec 1>>${LOG_OUTPUT} 2>&1
==================================================
# All redirected to 2 different log files
LOG_OUTPUT=etup_output.log
LOG_ERROR=setup_error.log
exec 3>&1 1>>${LOG_OUTPUT}
exec 2>>${LOG_ERROR}
# use 'P "my message"' instead of echo
P () {
# Print on console AND file
echo -e "\n$1" | tee /dev/fd/3
# Print ONLY on console
#echo -e "\n$1" 1>&3
}
==================================================
# ALL stdout and stderr to $LOG_OUTPUT
# Also stderr to $LOG_ERROR (for extra checks)
# P function to print to the console AND logged into $LOG_OUTPUT
LOG_OUTPUT=output.log
LOG_ERROR=error.log
exec 3>&1 1>>${LOG_OUTPUT}
exec 2> >(tee -i ${LOG_ERROR}) >> ${LOG_OUTPUT}
# use 'P "my message"' instead of echo
P () {
# Print on console AND file
echo -e "$1" | tee /dev/fd/3
# Print ONLY on console
#echo -e "\n$1" 1>&3
}
# use 'P "my message"' instead of echo to print in BLUE
P () {
BLUE='\033[1;34m'
NC='\033[0m' # No Color
echo -e "\n${BLUE}${1}${NC}" | tee /dev/fd/3
}