Linux Command Tips
Killing processes in one Line
# kill -9 `ps -ef | grep rsync| grep -v grep| awk '{print $2}'`
Check CPU Temperature
# echo `date +%b-%d-%H:%M:%S` | tr -d '\ 012' ; echo -n ' '; sensors | awk '/CPU Temp:/{ print $3 }'
Check those commands which have been used most
# history|awk '{print $2}' |awk '{print $1}' | sort | uniq -c | sort -rn | head -10
Mount / partition in "Repair Mode"
Free Memory on Linux at Runtime
# sync
Sometime Apache process, keeps on execution (Seems like Hangs), so generally trying to get the exact PHP file that is running by Apache Process, So here is my Try. I used Strace to get the opened files by the apache process. (Get PID of Apache process that is taking time, though you can also get it From top command) # pstree -p -n | grep http (This will show each files that is being processed by that Apache Proc) # strace -p The list of files could also be get using lsof, but that could not be of full use, as you need the files continuusly using by Apache Process |
| Create many Files Sequentially # seq -w 1 30 | xargs -i -t zcat in_Feb2011/in_Files-{}May2011.gz | grep -E 'name.html?secsid=3304847|name.html?secsid=30780899' |
| Delete Empty Directories # find folder/ -type d -empty | xargs -i -t rm -rf {} or # find folder/ -type d -empty -delete |
| Tail, Vmstat and Date in Loop, Output every 10 Sec # vmstat 1 1;for ((;;));do date; vmstat 10 2 | tail -n1;done |
| Real Time Monitoring on Linux # watch -n1 --difference "echo "Uptime"; uptime; echo \n ; ps -eo pcpu,pid,args | sort -k 1 -r |grep -v watch | head -10; echo "\n" ; tail /var/log/cron | grep "check_load" |
| Find files based and sorted on Size # find / -type f -size +20000k -exec ls -lh {} \; 2> /dev/null | awk '{ print $NF ": " $5 }' | sort -nrk 2,2 |
Check Memory Fault # dd if=/dev/urandom bs=768304 of=/tmp/memtest count=1050 # md5sum /tmp/memtest; md5sum /tmp/memtest; md5sum /tmp/memtest |
| Repair Mysql MYISAM File # myisamchk --force --sort_buffer_size=64M --key_buffer_size=16M --read_buffer_size=8M --write_buffer_size=8M ../data/phplists/phplist_linktrack.MYI |
DELETE mail Que from Qmail Steps: # qmail stop # find /var/qmail/queue/mess -type f -exec rm {} \; # find /var/qmail/queue/info -type f -exec rm {} \; # find /var/qmail/queue/local -type f -exec rm {} \; # find /var/qmail/queue/intd -type f -exec rm {} \; # find /var/qmail/queue/todo -type f -exec rm {} \; # find /var/qmail/queue/remote -type f -exec rm {} \; # qmail start |
| Display sorted process taking most CPU in descending order # ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10 |
Download FTP files Recursivly using ncftpget Syntax: ncftpget -R -v -u "" -p " " # ncftpget -R -v -u "ibnlive" -p "ibn123" ftpserver /temp/ /www.domain.com/2009_Feb/* |
Command to make Services off in Defined Level on Linux # chkconfig --list | awk '{print $1}' | cut -d: -f1 | grep -vE '^crond|^network|^sshd|^syslog|^iptables' | awk '{print $1}' | while read line; do chkconfig --level 3 $line off; count=`expr $count + 1`; echo $count $line;done or Use this... One lineer # chkconfig --list | awk '{print $1}'| grep -vE '^crond|^network|^sshd|^syslog|^iptables' | xargs -i chkconfig --level 3 {} off |
Counting Hits from Web Server Access log # awk '{print $1}' /opt/indian.com/access_log | grep -vE '^:|^common|^-' | sort | uniq -c | sort -nr > /var/www/reports/ips/indian.txt or # awk '$1>10000 {print $1}' /opt/indian.com/access_log | uniq -c | sort -nr > /var/www/reports/ips/indian.txt |
| PERL Search and Replace Text Pattern using Perl On linux Platform # find . -type f -name "*.html" | xargs perl -pi~ -e 's/\/js\/active18\//\/read\/js\/active18\//' |
Killing processes in one Line
# kill -9 `ps -ef | grep rsync| grep -v grep| awk '{print $2}'`
Check CPU Temperature
# echo `date +%b-%d-%H:%M:%S` | tr -d '\ 012' ; echo -n ' '; sensors | awk '/CPU Temp:/{ print $3 }'
Check those commands which have been used most
# history|awk '{print $2}' |awk '{print $1}' | sort | uniq -c | sort -rn | head -10
Mount / partition in "Repair Mode"
Repair filesystem # mount -w -o remount / Free Memory on Linux at Runtime
# sync
# echo 3 > /proc/sys/vm/drop_caches
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