I have a file in /tmp/a.crt I will have to make a.tgz which contains a.crt not tmp/a.crt. As i am running tar command through java I can't navigate to /tmp and execute tar -cvf a.tgz a.crt If i run tar -cvf a.tgz /tmp/a.crt it creates a a.tgz which contains tmp/a.crt .

I tried tar --exclude='/tmp' -cvf a.tgz /tmp/a.crt but while untaring it says

gzip: stdin: not in gzip format

tar: Child returned status 1

Is there any way to achieve my requirement.

CodePudding user response：

Here is a Bash session demonstrating what you want (as I understand it):

# first, create test files
$ mkdir tmp
$ touch tmp/a.crt
$ find .
.
./tmp
./tmp/a.crt

# use "-C" to keep the filename out of the archive
$ tar -C tmp -cvf a.tgz a.crt
a.crt

# confirm results
$ tar tf a.tgz 
a.crt

As you can see, in the final a.tgz file, there is no tmp/ directory present.

This is generally a bad idea, creating what is sometimes called a "tar bomb" (link). But presumably you have a good reason for it (:

CodePudding user response：

If you want to create a compressed tar file (.tgz or .tar.gz), you have to use the option z. Otherwise you have only an uncompressed tar file (.tar). You probably omitted this option during creation.