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Full Discussion: Check parameter is number or string
Top Forums Shell Programming and Scripting Check parameter is number or string Post 302529949 by alister on Saturday 11th of June 2011 03:02:14 PM
Old 06-11-2011
Quote:
Originally Posted by bartus11
Try:
Code:
if [ $(echo $1 | egrep "^[0-9]+$") ]

That's actually a poor solution. Should the value being tested expand to multiple fields, it could lead to syntax errors or other forms of unexpected behavior.

You could quote the command substitution, to ensure that test/[ is only passed a single argument, but, if using grep anyway, I would drop the use of test/[ altogether, redirect the output of egrep to /dev/null (or use the -q option if available), and allow the if statement to use egrep's exit status directly.

---------- Post updated at 03:02 PM ---------- Previous update was at 02:58 PM ----------

A different approach:

Code:
case $1 in
    *[!0-9]*)  echo Error. Not a number.;;
           *)  echo OK. ;;
esac

Regards,
Alister
Last edited by alister; 06-11-2011 at 04:07 PM..
 

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LEARN ABOUT CENTOS

grub2-file

GRUB-FILE(1)						      General Commands Manual						      GRUB-FILE(1)

NAME

       grub-file -- Check if FILE is of specified type.

SYNOPSIS

       grub-file (--is-i386-xen-pae-domu | --is-x86_64-xen-domu |
		  --is-x86-xen-dom0 | --is-x86-multiboot |
		  --is-x86-multiboot2 | --is-arm-linux | --is-arm64-linux |
		  --is-ia64-linux | --is-mips-linux | --is-mipsel-linux |
		  --is-sparc64-linux | --is-powerpc-linux | --is-x86-linux |
		  --is-x86-linux32 | --is-x86-kfreebsd | --is-i386-kfreebsd |
		  --is-x86_64-kfreebsd | --is-x86-knetbsd |
		  --is-i386-knetbsd | --is-x86_64-knetbsd | --is-i386-efi |
		  --is-x86_64-efi | --is-ia64-efi | --is-arm64-efi |
		  --is-arm-efi | --is-hibernated-hiberfil | --is-x86_64-xnu |
		  --is-i386-xnu | --is-xnu-hibr | --is-x86-bios-bootsector)
		  FILE

DESCRIPTION

       grub-file is used to check if FILE is of a specified type.

OPTIONS

       --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

SEE ALSO

       info grub

								  Web Feb 26 2014						      GRUB-FILE(1)
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