How to test group permissions 1

[soonerhater]

In the Korn shell in unix, of course, -r, -w, & -x are the test operators for user access permissions. how do you test group and global permissions?

 

[aixmurderer]

ls -l of a file will reveal the permissions. You will find 3 sets of rwx, 1st is user, 2nd is group, 3rd is world(global).
If you know your octal code then it's easy to set it using chmod, e.g. chmod 777 filename will set it to rwxrwxrwx, 600 will set it to rwx------, etc.

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[soonerhater]

I know how to set it, i need to know how to test it in an if/then statement.

 

[Ygor]

You could test for matching patterns....

#----get file permissions
ls -l $FILE | read PERM ETC

#----example tests
if [[ $PERM = -???r????? ]]
then
echo file is group readable
fi
if [[ $PERM = -??????r?? ]]
then
echo file is world readable
fi
if [[ $PERM = -r?x------ ]]
then
echo file is executable by owner only
fi

 

[soonerhater]

Thanks, Ygor, that was exactly what i needed to know.

 

[SamBones]

In the Korn shell you can do this...

[[ -G filename ]] && print "Same effective group as curr process"

Hope this helps.

 

[SamBones]

Also...

[[ -r filename ]] && print "File is readable"

Hope this helps.