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Packing a tar, jar or war file - best practise
Scenario - a contact emails you a [tjw]ar file containing - let's say - 20 files within it. You unpack it in a directory that already has 15 files in it ... and you end up with 30 file. Hmm - not what you might have expected; you were expecting 35 files in total. What went wrong? Five of the files that you unpacked had names that were named the same as files that already existing in the directory in which you unpacked and by unpacking there you have overwritten the original files. Which could be a major issue if the files had the same name in the existing directory and archive, but the content differed. It's to avoid problems like this that you need a best practise for creating and unpacking tar / jar / war files Best Practise: 1. If you receive a jar / war / tar file, you should create an empty directory and unpack it within that. Yes - that might (should) result in a directory that contains only another directory ... but that's far better than the potential corruption if you unpack into a populated area. 2. If you are creating a jar / tar file, you should move to the directory level ABOVE the one in which the files are contained, and pack the file from there: tar czf htdocs_8.2.2.tgz htdocs_8.2.2and you should ideally name the file and the directory with a version number or date. Regrettably, if you're creating a war file (web archive), you'll need to flout good practise #2 and pack it from within the directory: jar cf /tmp/marmite.war *as .war files need to be created in this was to be able to be unpacked and (auto)deployed without changing paths or renaming. Advise from our Deploying Apache httpd and Tomcat course which I've been running in the latter half of this week. (written 2012-07-26, updated 2012-08-11) Associated topics are indexed under A502 - Web Application Deployment - Java - Basic Tools[3151] Disassembling Python and Java - previously compiled code - (2011-01-29) [2859] Using java, javac, jar, and CLASSPATH - a simple example - (2010-07-07) [2422] Looking inside Java classes - javap and javadoc - (2009-09-25) [2153] Class Loading and Variable Conversion in Java - (2009-05-02) [1909] javax.servlet cannot be resolved - how to solve - (2008-11-26) [1771] More HowTo diagrams - MySQL, Tomcat and Java - (2008-08-24) [1562] Java Compiler - needs all classes, compiles them all too - (2008-03-03) [1192] What are WEB-INF and META-INF directories? - (2007-05-18) [1082] Straight from the .jar - (2007-02-16) [754] tar, jar, war, ear, sar files - (2006-06-10) A101 - Web Application Deployment - Linux -An Introduction For Users [3791] The Kernel, Shells and Daemons. Greek Gods in computing - (2012-07-01) [3256] Displaying a directory or file system tree - Linux - (2011-04-22) [3179] Oops - I typed ci not vi, and have lost my file ... - (2011-02-21) [2831] Recording (a macro) in vi - (2010-06-27) [2636] Linux - useful tips including history and file name completion - (2010-02-15) [2494] Making Linux Politically correct - (2009-11-06) [2479] Accidentally typed ci rather than vi? - (2009-10-27) [2300] What does x on a linux directory mean? - (2009-07-21) [2299] How much space does my directory take - Linux - (2009-07-20) [2203] Always use su with minus. And where do programs come from? - (2009-05-27) [2201] Running straight from the jar, but not from a tar - (2009-05-26) [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23) [1902] sstrwxrwxrwx - Unix and Linux file permissions - (2008-11-23) [1897] Keeping on an even keel - (2008-11-21) [1893] Some Linux and Unix tips - (2008-11-18) [1803] FTP passive mode - a sometimes cure for upload hangs - (2008-09-20) [1764] Yank and Push - copy and move in vi - (2008-08-21) [1651] ls command - favourite options - (2008-05-23) [1527] Selecting file names in a shell - one word or another - (2008-02-02) [1438] Copy and paste / cut and paste and other vi techniques - (2007-11-20) [1408] Wireless hotel tips - FTP and Skype connections failing - (2007-10-26) [1366] awk - a powerful data extraction and manipulation tool - (2007-09-25) [1288] Linux run states, shell special commands, and directory structures - (2007-08-03) [1287] Work and play at Well House Manor - Football and Shell Shortcuts - (2007-08-02) [1259] Where am I and how did I get here? - (2007-07-05) [1068] ls -l report, Linux / Unix - types and permssions - (2007-02-06) [1013] Copy multiple files - confusing error message from cp - (2006-12-30) [1012] Moving files between Windows / DOS and Linux / Unix - (2006-12-30) [984] Cardinal numbers and magic numbers - (2006-12-14) [749] Cottage industry or production line data handling methods - (2006-06-07) [711] THE home directory or MY home directory - (2006-05-06) [710] Linux training Glasgow, Python programming course Dundee - (2006-05-05) [703] Copying files and preserving ownership - (2006-04-28) [679] More or less on the edge of the page - (2006-04-11) [659] Web Application Components - (2006-03-28) [593] Finding where the disc space has gone - (2006-02-06) [431] File permissions of Linux and Unix systems - (2005-08-31) [430] Linux commands - some basics - (2005-08-31) [249] An easy way out - (2005-03-17) [152] Aladdin, or careful what you wish. - (2004-12-15) [74] pushd and popd - (2004-10-05) [73] vi - full circle - (2004-10-04) A652 - Web Application Deployment - Tomcat -Sourcing, Installing and Initial Testing [2088] Changing the 404 - file not found - page in Tomcat - (2009-03-18) [1550] Java (JSP and Servlet examples) live on our server - (2008-02-23) [1049] Java 6, Apache Tomcat 6. - (2007-01-21) [837] Tomcat - Shutdown port - (2006-08-18) 1b42
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