
214 Important Linux features
DONE
INDEX
INDEX
• append filb to the end of the archive
tar rvf dira.tar filb
• append if fila does not exist in fila.tar or if it exists but has been modified
tar uvf dira.tar fila
• you can copy with relative pathnames e.g.
cd /u/data/guest/nmr
tar cvf dataseta
• or with absolute pathnames e.g.
tar cvf /u/data/guest/nmr/dataseta
13.2 Important Files
13.2.1 /etc/shadow
the file /etc/shadow:
• contains the complete password information
• has one line for each user (account) on the system, each line contains 9 fields
separated by colons
•example
root:$1$Oz.sVA5j$yMP3jpXgNTIjLTo6CZ7QK1:11432:0:99999:7:::
bin:*:11432:0:99999:7:::
daemon:*:11432:0:99999:7:::
adm:*:11432:0:99999:7:::
lp:*:11432:0:99999:7:::
sync:*:11432:0:99999:7:::
shutdown:*:11432:0:99999:7:::
halt:*:11432:0:99999:7:::
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