Check Validity of a Certificate File (PEM File)
# openssl x509 -in Certificates.pem -inform PEM -text -noout -enddate
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
5b:84:3e:8f:d3:1e:fc:67
Signature Algorithm: sha1WithRSAEncryption
Issuer: C=US, O=Sabe Inc., OU=Sabe Relations, CN=Sabe Certification Authority
Validity
Not Before: Oct 1 11:56:10 2011 GMT
Not After : Sep 30 11:56:10 2012 GMT
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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 <PID of Apache>
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
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| 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’
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| Delete Empty Directories
# find folder/ -type d -empty | xargs -i -t rm -rf {}
or
# find folder/ -type d -empty -delete
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| Tail, Vmstat and Date in Loop, Output every 10 Sec
# vmstat 1 1;for ((;;));do date; vmstat 10 2 | tail -n1;done
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| 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 |
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Check Memory Fault
# dd if=/dev/urandom bs=768304 of=/tmp/memtest count=1050
# md5sum /tmp/memtest; md5sum /tmp/memtest; md5sum /tmp/memtest
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| 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 |
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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
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| Display sorted process taking most CPU in descending order # ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10 |
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Download FTP files Recursivly using ncftpget
Syntax:
ncftpget -R -v -u “<username>” -p “<password>” <servername not IP> <local Path to store /temp><destination FTP Server file Path /www.domain.com/2009_Feb/*>
# ncftpget -R -v -u “ibnlive” -p “ibn123” ftpserver /temp/ /www.domain.com/2009_Feb/*
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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
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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
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| 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 Free Memory on Linux at Runtime # echo 3 > /proc/sys/vm/drop_caches
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