03-01-2005
You can also use typeset -i to define your variable as an integer. You would also have to dump the error stream to /dev/null if you attempt to assign a string to the variable (this is easily done by simply by redirection 2> /dev/null)
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LEARN ABOUT CENTOS
grub-file
GRUB-FILE(1) User Commands GRUB-FILE(1)
NAME
grub-file - check file type
SYNOPSIS
file OPTIONS FILE
DESCRIPTION
Check if FILE is of specified type.
--is-i386-xen-pae-domu
Check if FILE can be booted as i386 PAE Xen unprivileged guest kernel
--is-x86_64-xen-domu
Check if FILE can be booted as x86_64 Xen unprivileged guest kernel
--is-x86-xen-dom0
Check if FILE can be used as Xen x86 privileged guest kernel
--is-x86-multiboot
Check if FILE can be used as x86 multiboot kernel
--is-x86-multiboot2 Check if FILE can be used as x86 multiboot2 kernel
--is-arm-linux
Check if FILE is ARM Linux
--is-arm64-linux
Check if FILE is ARM64 Linux
--is-ia64-linux
Check if FILE is IA64 Linux
--is-mips-linux
Check if FILE is MIPS Linux
--is-mipsel-linux
Check if FILE is MIPSEL Linux
--is-sparc64-linux
Check if FILE is SPARC64 Linux
--is-powerpc-linux
Check if FILE is POWERPC Linux
--is-x86-linux
Check if FILE is x86 Linux
--is-x86-linux32
Check if FILE is x86 Linux supporting 32-bit protocol
--is-x86-kfreebsd
Check if FILE is x86 kFreeBSD
--is-i386-kfreebsd
Check if FILE is i386 kFreeBSD
--is-x86_64-kfreebsd
Check if FILE is x86_64 kFreeBSD
--is-x86-knetbsd
Check if FILE is x86 kNetBSD
--is-i386-knetbsd
Check if FILE is i386 kNetBSD
--is-x86_64-knetbsd Check if FILE is x86_64 kNetBSD
--is-i386-efi
Check if FILE is i386 EFI file
--is-x86_64-efi
Check if FILE is x86_64 EFI file
--is-ia64-efi
Check if FILE is IA64 EFI file
--is-arm64-efi
Check if FILE is ARM64 EFI file
--is-arm-efi
Check if FILE is ARM EFI file
--is-hibernated-hiberfil
Check if FILE is hiberfil.sys in hibernated state
--is-x86_64-xnu
Check if FILE is x86_64 XNU (Mac OS X kernel)
--is-i386-xnu
Check if FILE is i386 XNU (Mac OS X kernel)
--is-xnu-hibr
Check if FILE is XNU (Mac OS X kernel) hibernated image
--is-x86-bios-bootsector
Check if FILE is BIOS bootsector
-h, --help Display this help and exit. -u, --usage Display the usage of this command and exit.
SEE ALSO
The full documentation for grub-file is maintained as a Texinfo manual. If the info and grub-file programs are properly installed at your
site, the command
info grub-file
should give you access to the complete manual.
grub-file (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-FILE(1)