Database Reference
In-Depth Information
if
[[
-z
"$@"
]]
;
then
echo
" ${0##*/} <archive> - extract common file formats)"
exit
fi
# Required program(s)
req_progs
=(
7z unrar unzip
)
for
p in
${
req_progs
[@]
}
;
do
hash
"$p"
2>&-
||
\
{
echo
>&2
" Required program \"$p\" not installed."
;
exit
1;
}
done
# Test if file exists
if
[
! -f
"$@"
]
;
then
echo
"File "
$@
" doesn't exist"
exit
fi
# Extract file by using extension as reference
case
"$@"
in
*.7z
)
7z x
"$@"
;;
*.tar.bz2
)
tar xvjf
"$@"
;;
*.bz2
)
bunzip2
"$@"
;;
*.deb
)
ar vx
"$@"
;;
*.tar.gz
)
tar xvf
"$@"
;;
*.gz
)
gunzip
"$@"
;;
*.tar
)
tar xvf
"$@"
;;
*.tbz2
)
tar xvjf
"$@"
;;
*.tar.xz
)
tar xvf
"$@"
;;
*.tgz
)
tar xvzf
"$@"
;;
*.rar
)
unrar x
"$@"
;;
*.zip
)
unzip
"$@"
;;
*.Z
)
uncompress
"$@"
;;
*
)
echo
" Unsupported file format"
;;
esac
Now, in order to decompress this same file, you would simply use:
$
unpack logs.tar.gz
Converting Microsoft Excel Spreadsheets
For many people, Microsoft Excel offers an intuitive way to work with small data sets
and perform calculations on them. As a result, a lot of data is embedded into Micro‐
soft Excel spreadsheets. These spreadsheets are, depending on the extension of the
filename, stored in either a proprietary binary format (
.xls
) or as a collection of com‐
pressed XML files (
.xlsx
). In both cases, the data is not readily usable by most
command-line tools. It would be a shame if we could not use those valuable data sets
just because they are stored this way.
