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FAQ（よくある質問と回答）
カテゴリ
Linux - command
fuser - Which process is using TCP port 22?
grep & sed & sort - How to get list of java import package?
nl - How to number lines of files?
sed - HANDY SED REFERENCE
fuser - Who and which process is accessing file in /home?
How to convert *.zip.ack files to *.zip files?
date - How to get current timestamp?
awk - How to convert timestamp to well formatted date/time?
How to get last modified YYYY-MM-DD of test.txt?
How to add '\' before each '/' in "http://skito.no-ip.org"?
find - How to find files which are older than new.txt?
find - find all .c files which are newer than Makefile
find - find java files which have not changed within 7 days
sed - How to to change all occurrences of "lamb" to "ham" in the poem.txt file?
mail - How to send email with an attachment?
iptables - How to list packet filtering rule?
How to convert Windows file to Unix file?
How to delete blank lines?
nohup - run a command immune to hangups, with output to a non-tty
at - executes commands at a specified time
fc -l - Would list the history of commands on the computer
mail - How to test if I can send out email from this stack?
cut - How to get file's prefix or suffix?
w - Show who is logged on and what they are doing.
uuencode - encode a binary file, or decode its representation
nmap - Network exploration tool and security / port scanner
expect - programmed dialogue with interactive programs
route - Display the current routing cache
How to remove ^M from a file?
How to get stack trace?
time - time a simple command or give resource usage
seq - print a sequence of numbers
Linux - bash script
How to read a line from a file?
How to search key word in a number of zipped text files?
How to get pid of last background job?
How to debug only part of script?
How to delete spam mails?
How to get file's epoch time?
How to execute ssh without interaction?
Ruby
Net-SSH
Java - Encoding
How to use Base64 encoding?
Java - Performance
Introduction
Load-Balancing
Disk
CPU
Data Structure, Algorithm
I/O , Log, Console output
Loop, Switch, Recursion
Object
JDK
Profiling
JDBC
Java - Date
DateFormat and SimpleDateFormat Examples
Java - Remote Debugging
How to do remote debugging?
Java - String & XML
How to compare String objects in different ways?
How long is your String object?
How to convert String to int, double, or float?
How to remove HTML tag?
WebRowSet
Java - J2SE 5.0 and 6.0
Installation (SE5.0)
DelayQueue (SE5.0)
Annotation (SE5.0)
JDBC 4.0 Features (Java SE 6.0)
Uninstallation (SE5.0)
Java - thread dump
How to get thread dump?
Java - Exception or Error
How to convert an exception into a string?
Unsupported major.minor version 49.0
java/class file has wrong version 49.0, should be 48.0
Java - JSP
Introduction
Directive
Action
Script
Java - jar
How to check jar contents?
How to add/update class in a jar file?
Java - Tools
Code Analyzer for Java
Oracle - SQL
IN - How to select records where colA is Test1, Test2, or Test3?
GREATEST - How to get max in expr?
CASE - apply IF-THEN-ELSE in SQL
COALESCE - return first non-null in expr
NULLIF - if expr1 is equal to expr2, then NULL, else expr1
NVL2 - if is not null, then val1, else val2
NVL - if X is null, then return Y
TO_DATE - How to convert string to date?
TO_CHAR - How to conver number to string?
LEAST - How to get min in expr?
AVG - How to get average?
CAST - How to convert TIMESTAMP datatype to DATE datatype
Flashback Query - Oracle 9i or above
scalar subquery - Include SELECT in another SELECT statement
HAVING - How to restrict conditionally the output of a SQL statement, by a SQL aggregate function used in your SELECT list of columns?
GROUP BY - How to group the result dataset by certain database table column(s)?
SUM - How to get total of n?
MIN - How to get minimum value of expr?
COUNT - How to get column which is not NULL?
TO_NUMBER - How to convert string to number?
SYSDATE - How to get current date/time?
LOWER - How to convert strings to lower case?
UPPER - How to convert strings to upper case?
INITCAP - How to change the first letter of each word to upper case?
SUBSTR - How to return char from n th to m chars?
LENGTHB - How to get number of string bytes?
LENGTH - How to get number of characters?
ORDER BY - How to sort?
LIKE - How to select records with colA ends with 'X'?
CONCAT - How to concat char1 and char2?
LPAD - How to pad * on the left to make value 10 digit?
MONTHS_BETWEEN - How to get the number of months between date1 and date2?
NEXT_DAY - How to get date for next day x?
LAST_DAY - How to get last day of month?
ADD_MONTHS - How to add month n to date?
DATE - How to add/subtract days?
REPLACE - How to replace?
TRIM - How to trim?
RPAD - How to pad * on the right to make value 10 digit?
TRUNC - How to group by date for datetime field?
Oracle - sqlplus
How to save the result of command in a file?
How to select columns which are separated with ','?
How to set 100 characters in a line?
How to run Stored Procedure with and without output parameter?
Oracle - admin
exp - export data
How to check Stored Procedure contents?
MySQL - Admin
GRANT - How to add a user?
SET PASSWORD - How to set/change password for a user?
MySQL - command
mysqlimport - How to import csv file?
mysqldump - dump database
MySQL - sql
How to get yesterday's data?
How to export data into csv file?
How to find out who is doing what?
GROUP BY
HAVING
How to get records with hour 23?
SQL - general
CREATE TABLE
ALTER TABLE
INSERT
JOIN
UPDATE
CVS
About
Installation
Configuration
Starting a project with CVS
Adding files to a directory
Adding folders to the repository
Checkout
Commit
Update
Status
DIFF
Delete a project
vi
vi REFERENCE
Tomcat
What is Tomcat?
Getting Started
package javax.servlet does not exist
1st Servlet - HelloWorld
Integrating Tomcat and Apache
log4j
Passing parameter from HTML to servlet
Admin Tool
Disable default port 8080
Disable directory listings
Bugzilla
Introduction
Install bugzilla
Install Perl modules
MySQL - Create a user
Configure all
Check
Samba
Unable to start smbd on FC5
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××にアクセスできません。このネットワークリソースを使用するアクセス許可がない可能性があります。
SpamAssassin
What is SpamAssassin?
How to set?
How to improve the hit-rate?
Security
List of bad IPs
How to disable root access from SSH?
OpenSSH - RSA
How to get attacker's IP?
Don't use defaul password
Snort
What is snort?
Installation
How to use?
Set snort to run automatically
TroubleShooting
Managing Alerts
Barcode4j
What is Barcode4j?
Features
Getting Started
Trouble Shooting
JFreeChart
What is JFreeChart?
Getting Started
Sample Chart
QRCode
What is QR Code?
How to create QRCode on web?
Net-SNMP + MRTG
What is MRTG (Multi-Router Traffic Grapher)?
What is Net-SNMP?
Installation
net-snmp Configuration
Run net-snmp
MRTG Configuration
Run MRTG
Automate MRTG statup
Change access control
Create MRTG index page
VNC
About
Download
Configuration
Run Server
Run VNC Viewer
Stop Server
Windows
How to clean disk completely?
How to lock computer with a single key stroke?
How to reset Administrator password when you lost it?
Google
Google Advanced Search
Excel
表のデータの縦横を入れ替えるには？
