Differences

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--- tar_usage [2020/12/04 15:47] – raju
+++ tar_usage [2023/01/26 21:20] – raju
@@ Line 1: / Line 1: @@
-=== relative file names in the archive ===
+==== count number of lines in a txz file ====
-==== Problem ====
-If we tar the following directory
 <code>
-% tree --charset=unicode /tmp/expt
+xz -cd foo.txz | wc -l
-/tmp/expt
-`-- insurance
-    |-- auto.txt
-    |-- condo.txt
-    `-- rv.txt
-directory, 3 files
-</code>
-using
-<code>
-% tar czvf insurance.tgz /tmp/expt/insurance
-tar: Removing leading `/' from member names
-/tmp/expt/insurance/
-/tmp/expt/insurance/auto.txt
-/tmp/expt/insurance/rv.txt
-/tmp/expt/insurance/condo.txt
-</code>
-then the file names in the .tgz contain the whole path releative to '/'.
-<code>
-% tar tzvf insurance.tgz
-drwxr-xr-x rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/auto.txt
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/rv.txt
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/condo.txt
-</code>
-But I want the paths to be relative to the 'insurance' directory. Something like
-<code>
-drwxr-xr-x rajulocal/rajulocal 0 2020-12-04 10:25 insurance/
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/auto.txt
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/rv.txt
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/condo.txt
 </code>
-==== Solution ====
-Use the -C option while creating the tar archive.
 <code>
-% tar czvf insurance2.tgz -C /tmp/expt insurance
+for i in *.txz; do echo $i; xz -cd $i | wc; done
-insurance/
-insurance/auto.txt
-insurance/rv.txt
-insurance/condo.txt
-</code>
-Test the archive.
-<code>
-% tar tzvf insurance2.tgz
-drwxr-xr-x rajulocal/rajulocal 0 2020-12-04 10:25 insurance/
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/auto.txt
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/rv.txt
--rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/condo.txt
-</code>
-==== How it works ====
-From the man page
-<code>
-% man tar
-...
-       -C, --directory=DIR
-              Change  to DIR before performing any operations.  This option is order-sensitive, i.e. it affects all
-              options that follow.
 </code>
-==== System information ====
-Debian Buster
+==== internal links ====
-<code>
+  * [[Relative file names in a tar archive]]
-% tar --version
-tar (GNU tar) 1.30
-</code>