Apache cheat sheet

# Setup a Virtual Domain
NameVirtualHost *

DocumentRoot /web/example.com/www
ServerName www.example.com
ServerAlias example.com
CustomLog /web/example.com/logs/access.log combined
ErrorLog /web/example.com/logs/error.log




# Include another conf file
Include /etc/apache/virtual-hosts/*.conf

# Hide apache version info
ServerSignature Off
ServerTokens Prod
Custom 404 Error message
ErrorDocument 404 /404.html

#Create a virtual directory (mod_alias)
Alias /common /web/common

#Perminant redirect (mod_alias)
Redirect permanent /old http://example.com/new

#Hide apache version infoCreate a cgi-bin
ScriptAlias /cgi-bin/ /web/cgi-bin/

Process .cgi scripts
AddHandler cgi-script .cgi

#Add a directory index
DirectoryIndex index.cfm index.cfm

#Turn off directory browsing
Options -Indexes
#Turn on directory browsing

#When applying directives to objects that reside in the filesystem always use or . When applying directives to objects that do not reside in the filesystem (such as a webpage generated from a database), use .


Options +Indexes

Create a new user for basic auth (command line)
htpasswd -c /etc/apacheusers
#Apache basic authentication
AuthName "Authentication Required"
AuthType Basic
AuthUserFile /etc/apacheusers

Require valid-user





#Only allow access from a specific IP



Order Deny,Allow
Deny from all
Allow from 127.0.0.1



Only allow access from your subnet
Order Deny,Allow
Deny from all
Allow from 176.16.0.0/16

mod_rewrite
#Turn on the rewrite engine
RewriteEngine On
# Redirect /news/123 to /news.cfm?id=123

# Flags

# [NC] No case sensitive
# [OR] Allows multiple lines
# [R=#] Redirect where # is number: 404.
# [L] Terminate routine

# . Every char
# < > = Compare
# \ Escape a char
# .+ One more, more chars
# .* No chars or multiple chars
# ^ Start
# $ End
# (…) Group
# a|b .A or B
# (a|b) .A or B group
# a{5} Exact 5 times a
# a{1,5} Between 1 and 5 times a
# [a-z]* Match chars
# -d Directory
# -f File
# -l Symbolic link



RewriteRule ^/news/([0-9]+)$ /news.cfm?id=$1 [PT,L]

#Redirect www.example.com to example.com
RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
RewriteRule ^(.*)$ http://example.com$1 [R=301,L]



#add apache user -b pass to the command line

htpasswd - b GroupToAddTo FirstNameLastName theVarySecretPass

Apache reads only on startup the its conf file

Add Apache to the startup (check you version of *x

# ln -s /etc/rc.d/init.d/apache /etc/rc.d/rc3.d/S57apache



Redirect all visitors except for those with User-Agent header starts with Googlebot from www.oxit.fi to oxit.fi

RewriteCond %{HTTP_USER_AGENT} !^Googlebot/
RewriteCond %{HTTP_HOST} ^www\.oxit\.fi

RewriteRule ^(.*)$ http://oxit.fi$1 [R=301]




Order allow,deny
Deny from all


RewriteRule ^(.*/)?\.secret/ - [F,L]

RedirectMatch 404 /\.secret(/|$)

perl oneliners

#Perl OneLiners Cheat Sheet

# run contents of "my_file" as a program
perl my_file

# run debugger "stand-alone"
perl -d -e 42

# run program, but with warnings
perl -w my_file

# run program under debugger
perl -d my_file

# just check syntax, with warnings
perl -wc my_file

# useful at end of "find foo -print"
perl -nle unlink

# add first and penultimate columns
perl -lane 'print $F[0] + $F[-2]'

# just lines 15 to 17
perl -ne 'print if 15 .. 17' *.pod

# in-place edit of *.c files changing all foo to bar
perl -p -i.bak -e 's/\bfoo\b/bar/g' *.c

# command-line that prints the first 50 lines (cheaply)
perl -pe 'exit if $. > 50' f1 f2 f3 ...

# delete first 10 lines
perl -i.old -ne 'print unless 1 .. 10' foo.txt

# change all the isolated oldvar occurrences to newvar
perl -i.old -pe 's{\boldvar\b}{newvar}g' *.[chy]

# command-line that reverses the whole file by lines
perl -e 'print reverse <>' file1 file2 file3 ....

# find palindromes
perl -lne 'print if $_ eq reverse' /usr/dict/words

# command-line that reverse all the bytes in a file
perl -0777e 'print scalar reverse <>' f1 f2 f3 ...

# command-line that reverses the whole file by paragraphs
perl -00 -e 'print reverse <>' file1 file2 file3 ....

# increment all numbers found in these files
perl i.tiny -pe 's/(\d+)/ 1 + $1 /ge' file1 file2 ....

# command-line that shows each line with its characters backwards
perl -nle 'print scalar reverse $_' file1 file2 file3 ....

# delete all but lines beween START and END
perl -i.old -ne 'print unless /^START$/ .. /^END$/' foo.txt

# binary edit (careful!)
perl -i.bak -pe 's/Mozilla/Slopoke/g' /usr/local/bin/netscape

# look for dup words
perl -0777 -ne 'print "$.: doubled $_\n" while /\b(\w+)\b\s+\b\1\b/gi'



#convert html to text
cat index.htm | perl -ne 's/\<[^<]*\>//g ;print $_'

Apache cheat sheet

# Setup a Virtual Domain
NameVirtualHost *

DocumentRoot /web/example.com/www
ServerName www.example.com
ServerAlias example.com
CustomLog /web/example.com/logs/access.log combined
ErrorLog /web/example.com/logs/error.log




# Include another conf file
Include /etc/apache/virtual-hosts/*.conf

# Hide apache version info
ServerSignature Off
ServerTokens Prod
Custom 404 Error message
ErrorDocument 404 /404.html

#Create a virtual directory (mod_alias)
Alias /common /web/common

#Perminant redirect (mod_alias)
Redirect permanent /old http://example.com/new

#Hide apache version infoCreate a cgi-bin
ScriptAlias /cgi-bin/ /web/cgi-bin/

Process .cgi scripts
AddHandler cgi-script .cgi

#Add a directory index
DirectoryIndex index.cfm index.cfm

#Turn off directory browsing
Options -Indexes
Turn on directory browsing

Options +Indexes

Create a new user for basic auth (command line)
htpasswd -c /etc/apacheusers
#Apache basic authentication
AuthName "Authentication Required"
AuthType Basic
AuthUserFile /etc/apacheusers

Require valid-user





Only allow access from a specific IP
Order Deny,Allow
Deny from all
Allow from 127.0.0.1
Only allow access from your subnet
Order Deny,Allow
Deny from all
Allow from 176.16.0.0/16

mod_rewrite
#Turn on the rewrite engine
RewriteEngine On
# Redirect /news/123 to /news.cfm?id=123

# Flags

# [NC] No case sensitive
# [OR] Allows multiple lines
# [R=#] Redirect where # is number: 404.
# [L] Terminate routine

# . Every char
# < > = Compare
# \ Escape a char
# .+ One more, more chars
# .* No chars or multiple chars
# ^ Start
# $ End
# (…) Group
# a|b .A or B
# (a|b) .A or B group
# a{5} Exact 5 times a
# a{1,5} Between 1 and 5 times a
# [a-z]* Match chars
# -d Directory
# -f File
# -l Symbolic link



RewriteRule ^/news/([0-9]+)$ /news.cfm?id=$1 [PT,L]

#Redirect www.example.com to example.com
RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
RewriteRule ^(.*)$ http://example.com$1 [R=301,L]



#add apache user -b pass to the command line

htpasswd - b GroupToAddTo FirstNameLastName theVarySecretPass