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-unknown-linux-gnu' -DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I. -I./include -I./lib -g -O2 uname output: Linux eccles 2.6.35-rc6 #1 SMP Fri Jul 23 11:52:29 BST 2010 x86_64 x86_64 x86_64 GNU/Linux Machine Type: x86_64-unknown-linux-gnu
Bash Version: 4.1 Patch Level: 2 Release Status: release Description: Incrementing a variable with ((count++)), which should access the value in the variable and then increment it by 1 has some strange behaviour. In some situations it seems to increment the variable before accessing it, and in others it increments it by 2 Repeat-By: Make an array to work with: andy:~$ days=({Mon,Tues,Wednes,Thurs,Fri,Satur,Sun}day) andy:~$ echo ${da...@]} Monday Tuesday Wednesday Thursday Friday Saturday Sunday So far, so good. Now try to access the array by stepping through it with ((count++)) andy:~$ count=0 andy:~$ echo "${days[$((count++))]}, ${days[$((count++))]}, ${days[$((count++))]}" Monday, Tuesday, Wednesday Also good. Now try converting it to lower case with ,, andy:~$ count=0 andy:~$ echo "${days[${count}],,}, ${days[$((count++))],,}, ${days[$((count++))],,}" monday, tuesday, thursday What happened to wednesday? Andy