Are you running BASH in POSIX mode? That's a option. Example:
[tsh009@it-johnmckown-linux junk]$ cat ro.sh #!/bin/bash readonly x="x" x="y" echo "sno" [tsh009@it-johnmckown-linux junk]$ ./ro.sh ./ro.sh: line 3: x: readonly variable sno [tsh009@it-johnmckown-linux junk]$ vim ro.sh [tsh009@it-johnmckown-linux junk]$ cat ro.sh #!/bin/bash set -o posix readonly x="x" x="y" echo "sno" [tsh009@it-johnmckown-linux junk]$ ./ro.sh ./ro.sh: line 4: x: readonly variable [tsh009@it-johnmckown-linux junk]$ On Tue, Dec 15, 2015 at 5:12 AM, Aurelien ROUGEMONT <be...@gandi.net> wrote: > Configuration Information [Automatically generated, do not change]: > Machine: x86_64 > OS: linux-gnu > Compiler: gcc > Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' > -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' > -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' > -DSHELL -DHAVE_CONFIG_H -I. -I../. -I.././include -I.././lib > -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -Wformat > -Werror=format-security -Wall > uname output: Linux clamavsig1 3.16.0-4-amd64 #1 SMP Debian > 3.16.7-ckt11-1+deb8u6 (2015-11-09) x86_64 GNU/Linux > Machine Type: x86_64-pc-linux-gnu > > Bash Version: 4.3 > Patch Level: 30 > Release Status: release > > Description: > in the posix shell specification [1] when a script tries to to > overwrite a readonly variable it should crash the script. > > Repeat-By: > #!/bin/bash > readonly rovar="goodvalue" > rovar="badvalue" > echo "You should not see this message" > > Fix: > the bash interpreter should exit when the readonly var is being > asked > for an overwrite > > > > [1] > > http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_08_01 > > > > -- > Aurelien Domain Name Registrar > \o/ Hosting For Geeks and more... > Gandi.net No Bullshit ! > > -- Schrodinger's backup: The condition of any backup is unknown until a restore is attempted. Yoda of Borg, we are. Futile, resistance is, yes. Assimilated, you will be. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! <>< John McKown
