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Top Forums 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
Old 07-17-2019
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.

Smilie I'm not advocating it, but it is something consider and make everyone panic about simple security Smilie



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(3)					     Library Functions Manual						  GRUB-MKRESCUE(3)

NAME
grub-mkrescue -- Generate a GRUB rescue image using GNU Xorriso. SYNOPSIS
grub-mkrescue [-o | --output=FILE] [--modules=MODULES] [--install-modules=MODULES] [--themes=THEMES] [--fonts=FONTS] [--locales=LOCALES] [--compress[=no,xz,gz,lzo]] [-d | --directory=DIR] [--grub-mkimage=FILE] [--rom-directory=DIR] [--xorriso=FILE] [--grub-glue-efi=FILE] [--grub-render-label=FILE] [--label-font=FILE] [--label-color=COLOR] [--label-bgcolor=FILE] [--product-name=STRING] [--product-version=STRING] [--sparc-boot] [--arcs-boot] DESCRIPTION
grub-mkrescue can be used to generate a rescue image with the GRUB bootloader. OPTIONS
--output=FILE Write the generated file to FILE. The default is to write to standard output. --modules=MODULES Pre-load modules specified by MODULES. --install-modules=MODULES Install only MODULES and their dependencies. The default is to install all available modules. --themes=THEMES Install THEMES. The default is to install the starfield theme, if available. --fonts=FONTS Install FONTS. The default is to install the unicode font. --locales=LOCALES Install only locales listed in LOCALES. The default is to install all available locales. --compress[=no,xz,gz,lzo] Compress GRUB files using the specified compression algorithm. --directory=DIR Use images and modules in DIR. --grub-mkimage=FILE Use FILE as grub-mkimage(1). The default is /usr/bin/grub-mkimage. --rom-directory=DIR Save ROM images in DIR. --xorriso=FILE Use FILE as xorriso. --grub-glue-efi=FILE Use FILE as grub-glue-efi(3). --grub-render-label=FILE Use FILE as grub-render-label(3). --label-font=FILE Use FILE as the font file for generated labels. --label-color=COLOR Use COLOR as the color for generated labels. --label-bgcolor=COLOR Use COLOR as the background color for generated labels. --product-name=STRING Use STRING as the product name in generated labels. --product-version=STRING Use STRING as the product version in generated labels. --sparc-boot Enable booting the SPARC platform. This disables HFS+, APM, ARCS, and "boot as disk image" on the i386-pc target platform. --arcs-boot Enable ARCS booting. This is typically for big-endian MIPS machines, and disables HFS+, APM, sparc64, and "boot as disk image" on the i386-pc target platform. -- All options after a -- will be passed directly to xorriso's command line when generating the image. SEE ALSO
info grub Wed Feb 26 2014 GRUB-MKRESCUE(3)
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