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Shell Programming and Scripting
What's the best way to check file permissions before moving files if needed?
Post 303036925 by rbatte1 on Wednesday 17th of July 2019 12:52:05 PM
07-17-2019
Moderator
You might also consider the test options for files (man test for more detail)
Another alternative might be to use stat to get the value you need. Jim is right though, you don't just need to check the files, but the directory permissions too to ensure you can write to them. The update needed will create or remove the ile as part of the move. It can also be a nice way to get around sensitive data input in a particular place that supposedly has been locked down, i.e. the file payroll-input.txt might have RW for the owner, Read for a group you are not in and nothing for the rest, but if you have access to update the directory, you can remove or rename the file then create your own.
I'm not advocating it, but it is something consider and make everyone panic about simple security
The output from stat -c '%a %U %G' might give you the basics of what you need and you might parse them to decide if you should continue.
There are, however, lots of probably better suggestions before mine, such as that from MadeInGermany.
Just more options.
Kind regards,
Robin
Another alternative might be to use stat to get the value you need. Jim is right though, you don't just need to check the files, but the directory permissions too to ensure you can write to them. The update needed will create or remove the ile as part of the move. It can also be a nice way to get around sensitive data input in a particular place that supposedly has been locked down, i.e. the file payroll-input.txt might have RW for the owner, Read for a group you are not in and nothing for the rest, but if you have access to update the directory, you can remove or rename the file then create your own.
I'm not advocating it, but it is something consider and make everyone panic about simple security The output from stat -c '%a %U %G' might give you the basics of what you need and you might parse them to decide if you should continue.
There are, however, lots of probably better suggestions before mine, such as that from MadeInGermany.
Just more options.
Kind regards,
Robin
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grub-mkrescue
GRUB-MKRESCUE(1) User Commands GRUB-MKRESCUE(1) NAME
grub-mkrescue - make a GRUB rescue image SYNOPSIS
grub-mkrescue [OPTION...] [OPTION] SOURCE... DESCRIPTION
Make GRUB CD-ROM, disk, pendrive and floppy bootable image. --compress=no|xz|gz|lzo compress GRUB files [optional] -d, --directory=DIR use images and modules under DIR [default=/usr/lib/grub/<platform>] --fonts=FONTS install FONTS [default=unicode] --install-modules=MODULES install only MODULES and their dependencies [default=all] -k, --pubkey=FILE embed FILE as public key for signature checking --locale-directory=DIR use translations under DIR [default=/usr/share/locale] --locales=LOCALES install only LOCALES [default=all] --modules=MODULES pre-load specified modules MODULES --themes=THEMES install THEMES [default=starfield] -v, --verbose print verbose messages. --arcs-boot enable ARCS (big-endian mips machines, mostly SGI) boot. Disables HFS+, APM, sparc64 and boot as disk image for i386-pc --core-compress=xz|none|auto choose the compression to use for core image --label-bgcolor=COLOR use COLOR for label background --label-color=COLOR use COLOR for label --label-font=FILE use FILE as font for label -o, --output=FILE save output in FILE [required] --product-name=STRING use STRING as product name --product-version=STRING use STRING as product version --rom-directory=DIR save ROM images in DIR [optional] --sparc-boot enable sparc boot. Disables HFS+, APM, ARCS and boot as disk image for i386-pc --xorriso=FILE use FILE as xorriso [optional] -?, --help give this help list --usage give a short usage message -V, --version print program version Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options. Generates a bootable CD/USB/floppy image. Arguments other than options to this program are passed to xorriso, and indicate source files, source directories, or any of the mkisofs options listed by the output of `xorriso -as mkisofs -help'. Option -- switches to native xorriso command mode. Mail xorriso support requests to <bug-xorriso@gnu.org>. REPORTING BUGS
Report bugs to <bug-grub@gnu.org>. SEE ALSO
grub-mkimage(1) The full documentation for grub-mkrescue is maintained as a Texinfo manual. If the info and grub-mkrescue programs are properly installed at your site, the command info grub-mkrescue should give you access to the complete manual. grub-mkrescue (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-MKRESCUE(1)