$ apt-get install arj
Para compactar um arquivo, ou pasta, digite:
$ arj a backup.arj cmais2/
ARJ32 v 3.10, Copyright (c) 1998-2004, ARJ Software Russia. [08 Mar 2011]
Updating archive : backup.arj
Archive created: 2013-05-24 13:09:53, modified: 2013-05-24 13:09:53
Replacing cmais2/Cmais_20130327.res.png 92.4%
Replacing cmais2/Cmais_20130327-resources.html 29.3%
Replacing cmais2/index.html 31.5%
Replacing cmais2/Cmais_20130327-tasks.html 9.3%
Replacing cmais2/Cmais_20130327.html 29.5%
Replacing cmais2/Cmais_20130327.png 83.9%
Replacing cmais2/Cmais_20130327-chart.html 31.5%
7 file(s)
ARJ32 v 3.10, Copyright (c) 1998-2004, ARJ Software Russia. [08 Mar 2011]
Updating archive : backup.arj
Archive created: 2013-05-24 13:09:53, modified: 2013-05-24 13:09:53
Replacing cmais2/Cmais_20130327.res.png 92.4%
Replacing cmais2/Cmais_20130327-resources.html 29.3%
Replacing cmais2/index.html 31.5%
Replacing cmais2/Cmais_20130327-tasks.html 9.3%
Replacing cmais2/Cmais_20130327.html 29.5%
Replacing cmais2/Cmais_20130327.png 83.9%
Replacing cmais2/Cmais_20130327-chart.html 31.5%
7 file(s)
Para extrair os arquivos, digite:
$ arj e backup.arj
ARJ32 v 3.10, Copyright (c) 1998-2004, ARJ Software Russia. [08 Mar 2011]
Processing archive: backup.arj
Archive created: 2013-05-24 13:09:53, modified: 2013-05-24 13:13:18
Extracting cmais2/Cmais_20130327.res.png to Cmais_20130327.res.png OK
Extracting cmais2/Cmais_20130327-resources.html to Cmais_20130327-resources.html OK
Extracting cmais2/index.html to index.html OK
Extracting cmais2/Cmais_20130327-tasks.html to Cmais_20130327-tasks.html OK
Extracting cmais2/Cmais_20130327.html to Cmais_20130327.html OK
Extracting cmais2/Cmais_20130327.png to Cmais_20130327.png OK
Extracting cmais2/Cmais_20130327-chart.html to Cmais_20130327-chart.html OK
7 file(s)
$
ARJ32 v 3.10, Copyright (c) 1998-2004, ARJ Software Russia. [08 Mar 2011]
Processing archive: backup.arj
Archive created: 2013-05-24 13:09:53, modified: 2013-05-24 13:13:18
Extracting cmais2/Cmais_20130327.res.png to Cmais_20130327.res.png OK
Extracting cmais2/Cmais_20130327-resources.html to Cmais_20130327-resources.html OK
Extracting cmais2/index.html to index.html OK
Extracting cmais2/Cmais_20130327-tasks.html to Cmais_20130327-tasks.html OK
Extracting cmais2/Cmais_20130327.html to Cmais_20130327.html OK
Extracting cmais2/Cmais_20130327.png to Cmais_20130327.png OK
Extracting cmais2/Cmais_20130327-chart.html to Cmais_20130327-chart.html OK
7 file(s)
$
Só para efeito de comparação, vamos comparar a mesma pasta compactada com o Gz e com o Bzip2
$ ls -l backup.*
-rw-r--r-- 1 ricardo ricardo 118838 Mai 24 13:13 backup.arj
-rw-r--r-- 1 ricardo ricardo 119558 Mai 24 13:13 backup.tar.bz2
-rw-r--r-- 1 ricardo ricardo 118600 Mai 24 13:13 backup.tar.gz
$
-rw-r--r-- 1 ricardo ricardo 118838 Mai 24 13:13 backup.arj
-rw-r--r-- 1 ricardo ricardo 119558 Mai 24 13:13 backup.tar.bz2
-rw-r--r-- 1 ricardo ricardo 118600 Mai 24 13:13 backup.tar.gz
$
Note como ele ficou menor que o Bzip2.
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