UNIX script to check file type

[Danny Fang]

Hi,

I'm attempting to place the command "file" in the script to check for specific file types.

I have some files in a diretory which has the .gzip extension. However, upon doing a check on such files, I found that they are not real gzip-ed files:
abkadirk[RNC10]$ file f1.gz
f1.gz: ASCII text

The real gzip file would be:
abkadirk[RNC10]$ file f2.gz
f2.gz: gzip compressed data, was "f2", from Unix

Therefore, may I know how do I implement a check a in my UNIX script which goes:

$INPUTD_DIR="/home/danny/samples"
for i in `ls $INPUT_DIR`
do
## if file has .gzip extension then
## if 'file' returns true if file type is gzip i.e. what value does the "file" return when it detected a gzip file?
## then unzip files in $INPUT_DIR
## end if
## move "incorrect" gzip files into /tmp dir.

Could anyone show me how do I script the portions in marked in ##, especially on checking the file extension and checking the return type of "file" command to see if it had returned a "true" when it detected a gzip file?


Thanks
Danny

[RAC_1]

for i in "/some_dir/*.gzip"
do
type=$(file ${i}|awk '{print $2}')
if [ ${type} = "gzip" ];then
mv ${i} /your_dest_for_gzip_file/.
elif [ ${type} = "ASCII" ];then
mv ${i} /tmp/.
else
echo "no files"
fi
done

Check it.

[inventsekar_1]

nice script RAC.

i am half the way with my little scripting skills.
-----------------------------
$INPUT_DIR="/test_dir"
mkdir gzip_dir
mkdir not_gzip_dir

for i in `ls $INPUT_DIR`
do
if
file $i |grep compressed
then
mv $i gzip_dir
else
mv $i not_gzip_dir
fi
-----------------------------

not completed. i dont know how to uncompress.
someone complete the script.

[Peter Nikitka]

Hi,

if you have preselected the files (use RACs method), you can easely deflate all compressed files:
...
cd $INPUT_DIR # containing now only zipped files

gunzip * # or gunzip *.gz

See he manpage of gunzip to get options.

mfG Peter

[Sandman!]

Hi Danny,

Here's another variation you could use in order to unzip the real gzip'ed files while moving others to the /tmp folder. It doesn't use the "file" command but relies on gunzip's return code to determine whether it's a real gzip'ed file or not:

$INPUT_DIR="/home/danny/samples"
for i in `ls $INPUT_DIR`
do
gunzip $i || mv $i /tmp
done

~hope it helps