{"id":921,"date":"2012-08-02T16:18:19","date_gmt":"2012-08-02T08:18:19","guid":{"rendered":"http:\/\/rmohan.com\/?p=921"},"modified":"2012-08-02T16:18:34","modified_gmt":"2012-08-02T08:18:34","slug":"linux-commands-not-usual","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=921","title":{"rendered":"Linux Commands – Not Usual"},"content":{"rendered":"

Check Validity of a Certificate File (PEM File)
\n<\/strong><\/h3>\n

# openssl x509 -in Certificates.pem -inform PEM -text -noout -enddate<\/strong><\/h3>\n

\u00a0\u00a0\u00a0<\/strong><\/h3>\n

\u00a0\u00a0\u00a0 Certificate:
\nData:<\/strong><\/h3>\n

Version: 3 (0x2)<\/p>\n

Serial Number:<\/p>\n

5b:84:3e:8f:d3:1e:fc:67<\/p>\n

Signature Algorithm: sha1WithRSAEncryption<\/p>\n

Issuer: C=US, O=Sabe Inc., OU=Sabe Relations, CN=Sabe Certification Authority<\/p>\n

Validity<\/p>\n

Not Before: Oct\u00a0 1 11:56:10 2011 GMT
\nNot After : Sep 30 11:56:10 2012 GMT<\/p>\n

<\/h3>\n\n\n\n
\n
Sometime Apache process, keeps on execution (Seems like Hangs), so\u00a0generally trying to get the exact PHP file that is running by Apache Process, So here is my Try.<\/strong><\/div>\n

\n<\/strong><\/div>\n
I used Strace to get the opened files by the apache process. (Get PID of\u00a0<\/strong><\/div>\n
Apache process that is taking time, though you can also get it From top \u00a0command)<\/strong><\/div>\n

\n<\/strong><\/div>\n
#\u00a0pstree -p -n | grep http<\/strong><\/div>\n
(This will show each files that is being processed by that Apache Proc)<\/strong><\/div>\n

\n<\/strong><\/div>\n
# strace -p <PID of Apache><\/strong><\/div>\n
The list of files could also be get using lsof, but that could not be of full use, as you need the files\u00a0continuusly\u00a0\u00a0using by Apache Process<\/strong><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/strong>
\n
\n<\/strong><\/h3>\n\n\n\n
Create many Files Sequentially<\/strong><\/p>\n
# <\/em>seq -w 1 30 | xargs -i -t zcat in_Feb2011\/in_Files-{}May2011.gz | grep -E ‘name.html?secsid=3304847|name.html?secsid=30780899’ <\/strong><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
Delete Empty Directories<\/strong><\/p>\n
# find folder\/ -type d -empty | xargs -i -t rm -rf {} <\/strong><\/div>\n
or <\/strong><\/div>\n
# find folder\/ -type d -empty -delete\u00a0<\/strong><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
Tail, Vmstat and Date \u00a0in Loop, Output every 10 Sec<\/strong><\/p>\n
# vmstat 1 1;for ((;;));do date; vmstat 10 2 | tail -n1;done<\/strong><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
Real Time Monitoring on Linux <\/strong>
\n# 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”<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
Find files based and sorted on Size<\/strong>
\n# find \/ -type f -size +20000k -exec ls -lh {} \\; 2> \/dev\/null | awk ‘{ print $NF “: ” $5 }’\u00a0 | sort -nrk 2,2<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
\n
Check Memory Fault <\/strong><\/div>\n
# dd if=\/dev\/urandom bs=768304 of=\/tmp\/memtest count=1050<\/strong><\/div>\n
# md5sum \/tmp\/memtest; md5sum \/tmp\/memtest; md5sum \/tmp\/memtest<\/strong><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
Repair Mysql MYISAM File
\n# myisamchk –force –sort_buffer_size=64M –key_buffer_size=16M –read_buffer_size=8M –write_buffer_size=8M ..\/data\/phplists\/phplist_linktrack.MYI<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
\n
DELETE mail Que from Qmail<\/div>\n
Steps:<\/div>\n
# qmail stop<\/div>\n
# find \/var\/qmail\/queue\/mess -type f -exec rm {} \\;<\/div>\n
# find \/var\/qmail\/queue\/info -type f -exec rm {} \\;<\/div>\n
# find \/var\/qmail\/queue\/local -type f -exec rm {} \\;<\/div>\n
# find \/var\/qmail\/queue\/intd -type f -exec rm {} \\;<\/div>\n
# find \/var\/qmail\/queue\/todo -type f -exec rm {} \\;<\/div>\n
# find \/var\/qmail\/queue\/remote -type f -exec rm {} \\;<\/div>\n
# qmail start<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
Display sorted process taking most CPU in descending order
\n# ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
\n
Download FTP files Recursivly using ncftpget<\/div>\n
Syntax:<\/div>\n
ncftpget -R -v -u “<username>” -p “<password>” <servername not IP>\u00a0\u00a0 <local Path to store \/temp><destination FTP Server file Path \/www.domain.com\/2009_Feb\/*><\/em><\/div>\n
\u00a0<\/em><\/div>\n
# ncftpget -R -v -u “ibnlive” -p “ibn123” ftpserver \/temp\/ \/www.domain.com\/2009_Feb\/*<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
\n
Command to make Services off in Defined Level on Linux<\/div>\n
# chkconfig –list | awk ‘{print $1}’ | cut -d: -f1 | grep -vE ‘^crond|^network|^sshd|^syslog|^iptables’ | awk ‘{print $1}’ | while read line; do chkconfig\u00a0 –level 3 $line off; count=`expr $count + 1`; echo $count $line;done<\/div>\n
<\/div>\n
or Use this… One lineer<\/div>\n
# chkconfig –list | awk ‘{print $1}’| grep -vE ‘^crond|^network|^sshd|^syslog|^iptables’ | xargs -i chkconfig –level 3 {} off<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/h3>\n\n\n\n
\n
Counting Hits from Web Server Access log<\/div>\n
# awk ‘{print $1}’ \/opt\/indian.com\/access_log | grep -vE ‘^:|^common|^-‘ | sort | uniq -c | sort -nr > \/var\/www\/reports\/ips\/indian.txt<\/div>\n
<\/div>\n
or\u00a0 # awk ‘$1>10000 {print $1}’ \/opt\/indian.com\/access_log | uniq -c | sort -nr\u00a0 > \/var\/www\/reports\/ips\/indian.txt<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n


\n<\/strong><\/strong><\/h3>\n\n\n\n
PERL Search and Replace Text Pattern using Perl On linux Platform
\n# find . -type f -name “*.html” | xargs perl -pi~ -e ‘s\/\\\/js\\\/active18\\\/\/\\\/read\\\/js\\\/active18\\\/\/’Killing processes in one Line
\n# kill -9 `ps -ef | grep rsync| grep -v grep| awk ‘{print $2}’`<\/p>\n

Check CPU Temperature
\n# echo `date +%b-%d-%H:%M:%S` | tr -d ‘\\ 012’ ; echo -n ‘ ‘; sensors | awk ‘\/CPU Temp:\/{ print $3 }’
\nCheck those commands which have been used most
\n# history|awk ‘{print $2}’ |awk ‘{print $1}’ | sort | uniq -c | sort -rn | head -10
\nMount \/ partition in “Repair Mode” Repair filesystem <\/code>
\n# mount -w -o remount \/<\/code><\/p>\n

Free Memory\u00a0 on Linux at Runtime
\n# sync<\/p>\n

# echo 3 > \/proc\/sys\/vm\/drop_caches<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Check Validity of a Certificate File (PEM File) # openssl x509 -in Certificates.pem -inform PEM -text -noout -enddate Certificate: Data: <\/p>\n

Version: 3 (0x2)<\/p>\n

Serial Number:<\/p>\n

5b:84:3e:8f:d3:1e:fc:67<\/p>\n

Signature Algorithm: sha1WithRSAEncryption<\/p>\n

Issuer: C=US, O=Sabe Inc., OU=Sabe Relations, CN=Sabe Certification Authority<\/p>\n

Validity<\/p>\n

Not Before: Oct 1 11:56:10 2011 GMT Not After : Sep 30 11:56:10 2012 GMT<\/p>\n

Sometime […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/921"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=921"}],"version-history":[{"count":2,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/921\/revisions"}],"predecessor-version":[{"id":923,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/921\/revisions\/923"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=921"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}