php -i | grep configure | tr -d \'

du -sckh * | sort -n

cat /etc/sitemap |  awk '{print $2}' | xargs -n 1 ping -c 1 -t 1 | grep PING | awk '{print $3}' | sort | uniq

while read k2;do <command> $k2;done < file

sed -i "s/$/<text to add>/" file

sed -i "s/^/<text to add>/" file

TERM=xterm-color; export TERM

(specifically used for SSL)

sed 's/\(.\{64\}\)/\1\n/g' file

find ./ -name ".htaccess"|xargs perl -pi -e 's/original/newstring/g'
--OR--
find . -type f -print0|xargs -0 perl -pi -e 's/mysql_connect \(\"pqr.k2patel.com/mysql_connect \(\"xyz.k2patel.com/g'
--OR--
for file in *; do [[ $file = remove ]] && continue; fgrep -vf remove "$file" > k2.tmp ; mv k2.tmp "$file"; done

vgscan --mknodes  //load the nodes in /etc
vgchange -ay    //activate the nodes
lvscan  //scan and check the status
mkdir /mnt/somename     //directory to mount
mount /dev/VolGroup00/LogVol00 /mnt/somename    //mount on directory

php_admin_flag safe_mode Off            //put this in the httpd.conf if nothing works
 
php_flag safe_mode Off
php_value safe_mode "0"
php_flag register_globals off
 
php_flag display_errors off
 
DirectoryIndex index.php index.shtml
ErrorDocument 404 /
ErrorDocument 403 /
ErrorDocument 500 /
ErrorDocument 302 /
 
ErrorDocument 403 http://www.k2patel.com
 
Redirect 301 / http://k2patel.com/show.php?m=1895&st=1&sid=65
 
php_flag log_errors on
php_flag safe_mode Off
php_flag register_globals on
 
php_value session.save_path /srv/www/apache/tmp

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

RewriteEngine on
RewriteCond $1 !^the/pathto/the/directory
RewriteRule (.*) http://www.newsite.com/$1 [R=301,L]
 
OR
 
RewriteEngine on
RewriteRule !^the/pathto/the/directory - [C]
RewriteRule (.*) http://www.newsite.com/$1 [R=301,L]

chflags noschg <file name>  -- unlock
chflags schg <file name> -- lock

VI : %s/^M//g
(To get the ^M hold the control key, press V then M (Both while holding the control key) and the ^M will appear.)
-OR-
sed 's/'"$(printf '\015')"'$//
-OR-
tr -d '\r' <old.file >new.file

find . ! -user tiffany | xargs chown tiffany:tiffany

find . -type d -name '5 "' -exec rm -Rv "{}" \;

ifconfig fxp0 inet <IP> netmask <sub-net> alias        -- add
ifconfig fxp0 inet <IP> netmask <sub-net> -alias       -- remove

while read -r k2 ; do sed -e 's!\$k2!'"$k2"'!g' < site.cnf  ; done < sitelist.cnf > site.all.cnf

# -d used as delimiter in example it is space " ".
paste -d " " file1 file2 >"outputfile1"

for i in `find . -type f` ; do mv $i /home/yahoo/Photos/ ;done

wget -r --no-clobber --continue --user=USERNAME --password=PASSWORD ftp://hostname
--OR--
ncftget -R ftp://ftp.mydomain.com  source dest

for i in `jot 251 4`; do echo xx.yy.pp.$i; done
--OR--
for ((i=4; i<=254; i++)); do echo "xx.yy.pp.$i"; done
--OR--
for i in {4..254}; do echo "xx.yy.pp.$i"; done

find . -type f -exec grep -q '*POSSIBLE SPAM*' {} \; -exec echo mv {} /home \;
--OR--
grep -rl 'POSSIBLE SPAM' |while read f; do mv "${f##*/}" "${DEST}"; done
--OR--
find . -type f -exec grep -Fq '*POSSIBLE SPAM*' -exec mv {} /home/ +  #maybe, or \;

date yymmddhhss

netstat -tlpn

sed -e 's#.*#nslookup & |awk '"'"'/^Name/{n=$2}/^Address/{a=$2}($2=="canonical"){c=sprintf("%s%s",c,$1)}END{print "& "n" "c" "a}'"'"'#' hostlist.txt|sh

cu -l /dev/cuaa0
ttyd0 "/usr/libexec/getty std.9600"   vt100   on secure
ttyd0 "/usr/libexec/getty std.9600" dialup off secure

find /srv/www/html -name '*.php' -o -name '*.htm*' -print0| xargs -0 grep -i '<script>function' | cut -d ':' -f1

mount -o loop disk1.iso /mnt/disk

it read sample config from sample.conf replace $k2 in that file with varlist and append all to file $k2.testing.cfg file

while read k2 ; do sed -e 's!\$k2!'"$k2"'!g' < /home/testing/sample.conf >> $k2.testing.cfg ; done < /home/testing/varlist

You may want to test a response of a HTTPS host using telnet port 443, however because of SSL, the httpd will not provide the information via telnet because of the lack of handshake for SSL certificate. You can use openssl as below:

openssl s_client -connect $host:443 -state -debug
GET / HTTP/1.0
Host: $host

This will print each space separated word on new line.

tr ' ' '\n' < file

In order to get all IP allocated to specific country you need to get list of IP Blocks.
you can get that list from following URL.

| IPv4

wget ftp://ftp.apnic.net/public/apnic/dbase/data/country-ipv4.lst

| IPv6

wget ftp://ftp.apnic.net/public/apnic/dbase/data/country-ipv6.lst

Now for IPv4, I never worked on IPv6 format so far so i am explaining IPv4 Only.
To generate list for all block from china you can simply use command as below.

cat country-ipv4.lst | awk -F : '{print $2, $3}' | grep cn | awk '{print $1}'

now you can save that file and use it.

Many times mysql password or MD5 on phpmyadmin does not work on resetting password.

admin = 21232f297a57a5a743894a0e4a801fc3
secret = 5ebe2294ecd0e0f08eab7690d2a6ee69
OU812 = 7441de5382cf4fecbaa9a8c538e76783

You can use following command in order to create MD5 HASH.

echo -n "9qL[%T#3SM" | md5sum

Show standard out to window and write to file

while $(/bin/true); do echo YAYYAYA; sleep 3; done > >(tee logfile)

while $(/bin/sleep 300); do pgrep -u jthomas -f java; if [ $? -eq '1' ]; then echo "Render Done" | mail -s "Render Done" beep-jthomas@something.com; fi done &

while read -r line; do grep $line /etc/passwd > /dev/null; if [ $? == 1 ]; then echo $line; fi;  done < /var/tmp/jtlist 

rpm -qa --queryformat='%{N}-%{V}-%{R}.%{arch}\n'

for k2 in $(rpm -qa); do rpm --setugids ${k2}; done 
for k2 in $(rpm -qa); do rpm --setperms ${k2}; done

sdiff <(sort list) <(sort masterList)

grep -v -e '^#\|^\W*$'

OR

grep '^[[:blank:]]*[^[:blank:]#;]' $file

date -d '1 month 15 days 2 hour 30 minute ago'

/sbin/ifconfig | grep 'inet ' | cut -d: -f2 | awk '{print $1}' | grep -v -e ^'\(127.0.0.1\|192.168.\|10.\)'

fc-list
OR
e.g. /usr/bin/fc-list :style=medium

Advanced Mail command which allow you to specify From.
it is now installed on most OS including RHEL / CentOS.

| Usage

nail -eiIUdEFntBDNHRV~ -T FILE -u USER -h hops -r address -s SUBJECT -a FILE -q FILE -f FILE \
-A ACCOUNT -b USERS -c USERS -S OPTION users
e.g. nail -r k2patel@mail.us -s "testing message" k2patel@hotmail.com

Print list of file in PWD

alias fltree="ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'"
fltree

for k2 in {71..95} ; do sed -e 's!\$k2!'"$k2"'!g' <test2 ; done

| Checking existing algorithm

authconfig --test | grep hashing

| Changing to stronger one

authconfig --passalgo=sha512 --update

sed -ie '/serial/s/[0-9][0-9]*/2014050900/' 

cat file.ps | ghostview -landscape -

python -c 'import yum, pprint; yb = yum.YumBase(); pprint.pprint(yb.conf.yumvar, width=1)'

Simple easy way to install perl module locally.

Simply install local::lib

In order to install module locally use command as shown below.

perl -MCPAN -Mlocal::lib -e 'CPAN::install(threads)'

Make sure you run sync command before each command here.
Alternatively you can use

sysctl -w vm.drop_caches=<number>

Free Dentries, Inodes and pagecache from cache memory

echo 3 > /proc/sys/vm/drop_caches

Free Inodes and Dentries from cache memory

echo 2 > /proc/sys/vm/drop_caches

*Free PageCache from memory**

echo 1 > /proc/sys/vm/drop_caches

Writing to /proc/sys/vm/drop_caches allows one to request the kernel immediately drop as much clean cached data as possible.
This will usually result in some memory becoming more obviously available; however, under normal circumstances this should not be necessary.
BE WARNED that using vm.drop_caches can cause a deadlock if the system is under heavy memory and I/O load!!!

ping -v -M do -s 8064 192.168.1.1

Simplest thing to do is use built in functionality to search and remove in command. Here is the file i've on my machine.

�^?

which translate to ''$'\250\177' <br> So check or list all the files with ascii in it.

ls [^[:ascii:]]*

now to remove

rm [^[:ascii:]]*

Regex can be modified to list all matching file before removal.

In linux proper way to test tcp or udp port connection without any software installed should be creating dev node.

/dev/<proto>/<host>/<port>

out put can be redirected to tty with help of cat.

cat < /dev/tcp/k2patel.in/3306

Setting mp3 tag on multiple file based on filename as song name.
Same artist.

while read k2; do id3tag -a'xyz guru' -A'SuperSpeed' -s"${k2%%.*}" -y'2021' "${k2}" ; done < <(ls *.mp3)

I had issue of no audio while playing file over DLNA.
I've did the transcoding so it can play audio on my Phillips 4K TV.

ffmpeg -i <input_file>.mp4  \
    -map 0:0 -map 0:1 -map 0:2 -map 0:3 -map 0:5 -map 0:12 \
	-c:v copy \
	-c:a:0 truehd -strict -2 \
	-c:a:1 ac3 \
	-c:s copy \
	<output_file>.mkv

OR

ffmpeg -i old_file.mp4 \
    -map 0:0 -map 0:1 -map 0:3 -map 0:5 \
    -c:v copy \
    -c:a:0 ac3 \
    -c:s copy \
    new_file.mp4

OR

ffmpeg -i old_file.mkv \
    -map 0:0 -map 0:1 -map 0:2 \
    -c:v copy \
    -c:a:0 ac3 \
    -c:s copy \
    -disposition:s:0 forced \
    new_file.mkv

1. First thing list all mapping on your existing file using 'ffmpeg -i <file>
2. Select all streams using map you would like to copy to your new file.
3. each map should be listed using map so i selected only 6 out of 12.
4. After that specify wich codecs to use.
5. in -c:v i'm copying video as is.
6. in -c:a:0 i'm converting audio to truehd
7. in -c:a:1 i'm also adding second audio stream which is ac3.
8. in -c:s i'm copying subtitles.