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Top Forums Shell Programming and Scripting WHy the double square brackets? Post 302264699 by mojoman on Thursday 4th of December 2008 03:33:32 PM
Old 12-04-2008
WHy the double square brackets?

One of the senior administrators gave me a shell script to modify and it begins as follows:

if [[ -s valid_users.tmp ]] && [[ -s invalid_users.tmp ]]
{more code follows}

Why the double square brackets?
 

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bup-fuse(1)						      General Commands Manual						       bup-fuse(1)

NAME
bup-fuse - mount a bup repository as a filesystem SYNOPSIS
bup fuse [-d] [-f] [-o] <mountpoint> DESCRIPTION
bup fuse opens a bup repository and exports it as a fuse(7) userspace filesystem. This feature is only available on systems (such as Linux) which support FUSE. WARNING: bup fuse is still experimental and does not enforce any file permissions! All files will be readable by all users. When you're done accessing the mounted fuse filesystem, you should unmount it with umount(8). OPTIONS
-d, --debug run in the foreground and print FUSE debug information for each request. -f, --foreground run in the foreground and exit only when the filesystem is unmounted. -o, --allow-other permit other users to access the filesystem. Necessary for exporting the filesystem via Samba, for example. EXAMPLE
rm -rf /tmp/buptest mkdir /tmp/buptest sudo bup fuse -d /tmp/buptest ls /tmp/buptest/*/latest ... umount /tmp/buptest SEE ALSO
fuse(7), fusermount(1), bup-ls(1), bup-ftp(1), bup-restore(1), bup-web(1) BUP
Part of the bup(1) suite. AUTHORS
Avery Pennarun <apenwarr@gmail.com>. Bup unknown- bup-fuse(1)
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