jar -tvf jarFile [ path ] [ … (Web site optimization)
jar -tvf jarFile [ path ] [ … ] List the contents of jarFile, optionally showing just path(s) jar -xvf jarFile [ path ] [ … ] Extract the contents of jarFile, optionally extracting just path(s) In these commands, the letters c, t, and x tell jar whether it is creating an archive, listing an archive’s contents, or extracting files from an archive. The fmeans that the next argument will be the name of the JAR file on which to operate. The v tells jar to be more verbose when displaying information about files. In verbose mode you can get information about file sizes, modification times, and compression ratios. Subsequent items on the command line (i.e., anything aside from the letters telling jar what to do and the file on which jar should operate) are taken as names of archive items. If you’re creating an archive, the files and directories you list are placed in it. If you’re extracting, only the filenames you list are extracted from the archive. (If you don’t list any files, jar extracts everything in the archive.) For example, let’s say we have just completed our new game: “spaceblaster.” All the files associated with the game are in three directories. The Java classes themselves are in the spaceblaster/game directory; spaceblaster/images contains the game’s images; and spaceblaster/docs contains associated game data. We can pack all of this in an archive with this command: % jar cvf spaceblaster.jar spaceblaster Because we requested verbose output, jar tells us what it is doing: adding:spaceblaster/ (in=0) (out=0) (stored 0%) adding:spaceblaster/game/ (in=0) (out=0) (stored 0%) adding:spaceblaster/game/Game.class (in=8035) (out=3936) (deflated 51%) adding:spaceblaster/game/Planetoid.class (in=6254) (out=3288) (deflated 47%) adding:spaceblaster/game/SpaceShip.class (in=2295) (out=1280) (deflated 44%) adding:spaceblaster/images/ (in=0) (out=0) (stored 0%) adding:spaceblaster/images/spaceship.gif (in=6174) (out=5936) (deflated 3%) adding:spaceblaster/images/planetoid.gif (in=23444) (out=23454) (deflated 0%) adding:spaceblaster/docs/ (in=0) (out=0) (stored 0%) adding:spaceblaster/docs/help1.html (in=3592) (out=1545) (deflated 56%) adding:spaceblaster/docs/help2.html (in=3148) (out=1535) (deflated 51%) jar creates the file spaceblaster.jar and adds the directory spaceblaster, in turn adding the directories and files within spaceblaster to the archive. In verbose mode, jar reports the savings gained by compressing the files in the archive. We can unpack the archive with this command:
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